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The Production Formula and Process Parameters for High-Quality Rigid PVC Foam Decorative Boards   Rigid PVC foam boards play a vital role in modern home decoration. So how are high-quality rigid PVC boards produced? Below, we have compiled a reference formula and process parameters for the production of rigid PVC foam decorative boards. Please note that adjustments should be made according to specific production conditions.   The Origin of Rigid PVC Foam Boards   The history of rigid PVC foam boards is relatively short. They were first developed in the 1970s, with industrial production truly taking off in the 1990s. Upon its emergence, this material was hailed as "the wood of the future." Its chemical composition is polyvinyl chloride (PVC). Rigid low-foam PVC products are extremely versatile and can replace almost all wood-based products, making them highly competitive with natural wood.   In recent years, rigid foam technology has developed rapidly. The United States, in particular, has made notable progress in rigid PVC foaming technology, with high investment and output, leading to the development of many innovative products. This has enabled the industrialization of rigid PVC foam products in the fields of building materials and furniture.   The processing technology for rigid PVC foam products has also advanced quickly. Whether in terms of equipment, molds, or formulation processes, all have met the requirements for foaming.   By adding wood powder or other fillers to PVC foam products, different properties can be achieved, broadening the application range of these products as substitutes for various construction and decorative materials. Additionally, rigid PVC foam products offer excellent surface decoration properties.   Compared with wood, rigid low-foam PVC materials are moisture-proof, anti-corrosive, insect-proof, flame-retardant, and require no painting. They are also non-toxic, odorless, and resistant to termites. These products not only save wood but also effectively improve living environments, making them the ideal indoor and outdoor building materials.   Beyond replacing wood, PVC low-foam materials can also substitute for other construction materials. Benefits include reduced raw material usage, resulting in lower product costs; lower thermal conductivity, improving insulation and heat retention; and reduced thermal expansion.   Today, PVC foam products are produced on a large scale, including rigid PVC free-foam and skin-foam solid boards, hollow boards, rigid PVC foam decorative profiles, pipes, and wood-plastic composites. Their applications are increasingly widespread in construction, packaging, and furniture industries.   Raw Material Requirements   PVC Resin: Grade 8 resin is commonly used due to its fast gelation speed, relatively low processing temperature, stable product quality, and easy density control. In recent years, many manufacturers have switched to Grade 5 resin.   Stabilizers: For environmentally friendly and effective stabilization, rare earth stabilizers are the first choice. However, due to their higher cost, they have not been widely adopted. As environmental regulations tighten, the future market for rare earth stabilizers looks promising. Calcium-zinc stabilizers present issues such as "zinc burning" and slightly lower stabilization efficiency, so they are used less frequently. Currently, lead salt stabilizers are the most widely used. Because foam boards have wide cross-section molds, long flow paths, and yellow foaming generates significant heat, stabilizers with high lead content and strong stabilization performance are required; otherwise, various product defects may occur.   Blowing Agents: The AC blowing agent releases a large amount of heat during decomposition, which can cause yellowing in the center of the cross-section. Therefore, a certain amount of white blowing agent should be added to absorb excess heat. The blowing agent should have a high mesh count to ensure uniform foaming without large bubbles.   Foaming Regulators: Through years of R&D and improvement, the technology for ACR foaming regulators has become increasingly mature, with stable performance and quality. For thin boards, regulators that promote rapid plasticization are recommended; for thick boards, regulators with slower plasticization but higher melt strength should be used.   Lubricants: A balance of initial, intermediate, and late-stage lubrication should be maintained to ensure that the material is protected by lubricants at all stages, allowing long-term stable production without precipitation or scaling.   Foaming Aids: A small amount of zinc oxide can be added to improve foam quality and cell structure. To reduce precipitation, a small amount of aluminum silicate may also be added.   Pigments:For enhanced aesthetics, titanium dioxide and optical brighteners can be added. To improve weather resistance, antioxidants and UV absorbers are recommended.   Fillers: Light calcium carbonate or heavy calcium carbonate can be used; activated calcium is not necessary. Fillers with a high mesh count are preferred.   We have done chemical products for over 30years. Our products include PVC RESIN, CPE, PE WAX, PARAFFIN WAX, STABILIZER, ACR, TIO2 and so on. One-stop purchase can save your time. Welcome inquiries: 86-18539282682(wechat/whatsapp).

PVC composite stabilizer It is widely used in the processing of PVC products, such as door and window profiles, drainage pipes, threading pipes, plastic plates, wires and cables, etc. Advantages 1.Excellent thermal stability and initial coloration, suitable for high filing, good cost performance. 2.Good internal and external lubrication balance and processing adaptability.   Calcium-zinc stabilizer Calcium zinc stabilizer is respectively used in pipes, pipe fittings, plates, profiles, such as injection molding, blown molding film, wire and cable products. Advantages 1.Excellent thermal stability and initial coloration, suitable for high filing, good cost performance2.Good internal and external lubrication balance and processing adaptability.3.Excellent resistance to separating out and spray frost, good compatibility, low volatility transferability.    

In the first quarter, PVC powder exports experienced rapid growth. In Q1 2026, domestic PVC powder exports hit a quarterly record high, with year-on-year growth. According to customs statistics, domestic PVC powder exports totaled 1.4169 million tons from January to March, marking a 45.13% increase year-on-year. March saw a historic monthly peak in PVC powder exports, with 684,000 tons exported, representing an 86.7% year-on-year surge. The major trading partners of PVC powder have remained relatively stable. In terms of export trade flows, the distribution of PVC powder exports in the first quarter showed little change, primarily concentrated in South Asia, Southeast Asia, Central Asia, and Africa. India consistently ranks as China's top trading partner, with PVC exports to India reaching 570,000 tons in the first quarter, accounting for 40% of total exports—a proportion nearly equivalent to the 2025 export share to India.   The cancellation of tax refund policies has led to a "rush to export" trend in PVC powder exports in the first quarter. The sustained and rapid growth of China's PVC powder exports in the first quarter is mainly supported by the "rush to export". The driving force behind the "export rush" phenomenon of PVC powder is a policy issued by the Ministry of Finance and the State Administration of Taxation. On January 8th, the Ministry of Finance and the State Administration of Taxation issued a notice on adjusting the export tax rebate policy for photovoltaic and other products. The export policy adjustment for PVC powder in the announcement is to cancel the tax rebate from April 1st. Previously, the export policy for PVC powder had been a full 13% tax rebate. So in the first quarter, both overseas buyers and domestic exporters wanted to seize the last opportunity for tax refunds, which drove the rapid growth of export volume. In addition, the fact that domestic prices are still in a global price trough is somewhat related. The export expectations for the second quarter remain optimistic. Under normal circumstances, in the first quarter, due to unexpected events, the PVC powder market experienced a "rush to export" phenomenon, which will inevitably overdraw some of the demand in the second quarter. In addition, after the cancellation of export tax rebates in the second quarter, the advantage of domestic export prices will also decrease. However, due to the emergence of the new variable of the Middle East situation, we still maintain an optimistic attitude towards PVC powder exports in the second quarter. Starting from February 28th, the situation in the Middle East began to heat up, with international oil prices soaring and oil and chemical industries such as ethylene significantly increasing. PVC also experienced a rebound trend, but fell back again in late March, with PVC experiencing the most significant decline. On the one hand, this is because domestic PVC is mainly produced by calcium carbide method, and the production of calcium carbide method PVC powder increased instead of decreasing in March. On the other hand, the situation in the Middle East has eased, and the commodity market is gradually desensitized to Middle Eastern factors, giving up premiums. The escalating situation in the Middle East did not result in a surge in PVC powder export orders in March, mainly due to the concentration of low-priced purchases from overseas in the early stage. In addition, due to the rapid rise in prices, overseas countries also chose to wait and see. In April, with the rapid decline of domestic prices, the price advantage increased significantly, while the overseas PVC process is mainly ethylene process, especially the PVC plants in Japan, South Korea, Southeast Asia and Taiwan, China of China are affected to some extent, and the overseas price decline is relatively small. Formosa Plastics in Taiwan is the world's largest producer of PVC powder and a barometer of prices in the Asian market. The Indian market is the most important import market in Asia and also the largest trading partner of China's PVC. Comparing the prices of PVC exports from mainland China to India and the price difference between Formosa Plastics and India, in April, the price of Formosa Plastics' shipments to India was 195 US dollars/ton higher than that of mainland China's ethylene based shipments, the highest in nearly two years and significantly higher than the average price difference of 50 US dollars/ton in the past two years. Generally, when the price difference reaches 70 US dollars/ton or more, the advantage of mainland China's ethylene based exports is very obvious. In April, the price of Formosa Plastics' goods to India was 318 US dollars/ton higher than that of mainland China's carbide method goods to India, significantly higher than the price difference of 69 US dollars/ton in the past two years.   We have done chemical products for over 30years. Our products include PVC RESIN, CPE, PE WAX, PARAFFIN WAX, STABILIZER, ACR, TIO2 and so on. One-stop purchase can save your time. Welcome inquiries: 86-18539282682(wechat/whatsapp).

 Domestic PVC Market Overview This week (April 2, 2026 – April 9, 2026), spot market prices continued to show a significant downward trend on a comprehensive comparative basis. The Middle East conflict saw the U.S. and Iran agree to a two-week ceasefire, leading to a broad sell-off in energy and chemical commodities. PVC also moved lower, though the decline was relatively milder. Key influencing factors this week include:   1. Futures market: Futures prices continued to decline steadily throughout the week, marking four consecutive sessions of losses since last Friday, with the lowest point reaching 5,073 — essentially returning to pre-rally levels. Additionally, as the main contract began shifting positions in April, the market remained weak, mainly driven by the fading geopolitical risk premium.   2. Supply: Weekly operating rates saw a slight overall decline, mainly due to maintenance and production cuts in the ethylene-based PVC sector, where operating rates continued to fall. In contrast, calcium carbide-based PVC maintained a high operating rate of around 85%, indicating ample supply.   3. Demand: Following the price drop in both futures and spot markets, spot market transactions improved. Downstream buyers showed increased buying interest, taking advantage of lower prices to restock.   4. Costs: Crude oil and monomer prices fell during the week, while calcium carbide prices dropped sharply by as much as RMB 400/ton.   5. Middle East situation: The market expects more oil to flow into the market following the ceasefire, but there are also concerns that the truce may not hold for long.   Overall, both futures and spot markets continued to decline for the week. By region, price changes were as follows: North China fell by RMB 325/ton, East China by RMB 325/ton, South China by RMB 355/ton, Northeast China by RMB 205/ton, Central China by RMB 255–270/ton, and Southwest China by RMB 200/ton.   We have done chemical products for over 30years. Our products include PVC RESIN, CPE, PE WAX, PARAFFIN WAX, STABILIZER, ACR, TIO2 and so on. One-stop purchase can save your time. Welcome inquiries: 86-18539282682(wechat/whatsapp).

PVC Spot Market Domestic PVC market mainstream transaction prices surged sharply on Monday, showing a significant increase. Estimates show: North China rose by 270 RMB/ton, East China rose by 250–280 RMB/ton, South China rose by 240–280 RMB/ton, Northeast China rose by 200 RMB/ton, Central China rose by 200 RMB/ton, and Southwest China rose by 200 RMB/ton. Upstream PVC manufacturers raised their ex-factory prices by roughly 100–150 RMB/ton, with more aggressive increases of 200–250 RMB/ton, including price hikes for off-site warehouses. Market quotations have once again fallen into a state of confusion, with spot prices rising rapidly. Both point-price and fixed-price offers coexist in the spot market, though point-price offers have lost significance. Basis quotations in East China were reported at 05 contract minus (150–250), in South China at 05 contract minus (flat to 60), and in North China at 05 contract minus (400–470). Although high quotations exist in the spot market, no actual transactions have been heard. The current trend in the spot market is very similar to the previous extreme surge, with prices rising but no actual trading activity, awaiting further adjustment and clarification. PVC Market Outlook Futures: The PVC 2605 contract futures price showed a significant upward movement starting from last Friday's night session, with highs approaching the daily price limit. The price maintained an upward trend throughout the day, forming a positive candlestick with a slightly long upper shadow and a small increase in open interest. The high of 6,364 moved above the upper Bollinger band. Technical indicators show the Bollinger Bands (13,13,2) opening upward significantly, with the daily MACD golden cross expanding. Technical indicators remain bullish. In terms of trading activity, long opening accounted for 23.8% versus short opening at 23.4%, while short covering was at 24.2% versus long covering at 23.4%. The continuous upward trend and the significant increase today, coupled with the futures closing at a relatively high level, suggest that in the short term, influenced by the Middle East conflict, futures prices may continue to maintain a strong upward trend. Spot: On the external front, international oil prices rose, with Brent crude reaching its highest level in nearly four years. This follows Iraq's declaration of force majeure on all oil fields developed by foreign oil companies, while the situation in Iran escalated further as the US prepared to deploy thousands more Marines and sailors to the Middle East. There are no signs of easing in the US-Israel conflict with Iran, with critical energy infrastructure inside Iran being attacked and Iran launching strikes against neighboring countries including Saudi Arabia, Qatar, and Kuwait. The Middle East situation has once again become tense, while domestically, many commodity and chemical sectors saw limit-up moves, with multiple futures contracts hitting daily price limits at the noon close. The PVC spot market also saw significant price increases today, with ethylene-based production operating rates still showing a declining trend. Reduced supply, coupled with the impact of the conflict, has led to another sharp rise in spot prices. Overall, in the short term, PVC spot prices are expected to continue operating at high levels.

       Since March 2026, the situation in the Middle East has remained tense, and the impact on PVC has shifted from emotional drive to tangible impact. The ethylene based PVC raw materials are limited and the cost inversion affects the gradual implementation of production reduction. The impact on PVC fundamentals during the week of March 12th is still relatively small, but if tensions continue to escalate, the bullish trend in PVC fundamentals will significantly expand.       The supply of raw material ethylene is restricted, and the production of ethylene based PVC has begun to substantially decrease. With the tense situation in the Middle East lasting for more than two weeks, overseas refining and chemical companies have successively announced production cuts due to force majeure, and the phenomenon of production cuts has generally increased. The subsequent arrival of ethylene has become scarce, and domestic ethylene prices have continued to rise. In the week of March 12th, domestic ethylene based PVC production cuts occurred one after another. According to Zhuochuang Information, there was a structural differentiation in the domestic PVC industry during the week of March 12th, with ethylene based PVC enterprises being the first to enter substantial production cuts. As of the week ending March 12th (March 6th March 12th), the overall operating load rate of PVC powder was 78.49%, a decrease of 0.93 percentage points compared to the previous period; The operating load rate of PVC powder produced by calcium carbide method was 81.89%, an increase of 1.48 percentage points compared to the previous period; The operating load rate of ethylene based PVC powder was 71.00%, a decrease of 6.24 percentage points compared to the previous period.     1. Raw Material Constraints & PVC Production Cuts China’s ethylene supply is highly dependent on Japan and South Korea, which rely heavily on Middle East crude oil (no short-term alternatives). With planned maintenance of Asian ethylene plants in Mar-Apr and prolonged Strait of Hormuz closure, domestic ethylene-based PVC producers face severe feedstock shortages (only enough for operation till the end of March) and have started production cuts. If tensions persist: - Next 1-2 weeks: Ethylene-based PVC operating rate may drop to 40-50%. - Next 1-2 months: Operating rate may fall to 20-30% due to widespread Asian refinery shutdowns. 2. Cost Inversion Impact Ethylene and VCM prices surged sharply amid Middle East tensions, outpacing PVC price growth, leading to continuous losses for ethylene-based PVC producers. Some are considering suspending PVC production to sell ethylene/VCM. Key price changes (as of early Mar): - East China ethylene: 9,000 yuan/ton, up 53.85% vs Feb 28. - CFR China ethylene: 1,175 USD/ton, up 66.67% vs Feb 27. - Xinpu Chemical VCM: 6,000 yuan/ton, up 46.34% vs Feb 24; export price ≈ 6,300 yuan/ton (RMB). 3. Market Outlook Calcium carbide-based PVC producers (accounting for ~70% of China’s PVC capacity) will gain great opportunities. With expanding ethylene-based PVC cuts and opening export windows, China’s PVC market is expected to enter a destocking phase in late March, with deeper destocking if Middle East tensions continue.   We have done chemical products for over 30years. Our products include PVC RESIN, CPE, PE WAX, PARAFFIN WAX, STABILIZER, ACR, TIO2 and so on. One-stop purchase can save your time. Welcome inquiries: 86-18539282682(wechat/whatsapp).

Statistics on Maintenance, Operating Load and Production Reduction of Domestic Ethylene-based PVC Enterprises (Continuous Update)   Tianjin Tianjin Dagu: Cut 33% (50–60% load) from Mar 10, raw material shortage → 40k tons/month impact Tianjin LG: Shutdown from Apr 1, raw material shortage → 34k tons/month impact Shandong Yantai Wanhua: Maintenance until Mar 15 → 17k tons/month impact Gulf Chemical: Normal operation → No impact Yangmei Hengtong: PVC plant shutdown from Mar 31 (shift to ethylene sales), strategy adjustment → 50k tons/month impact Jiangsu Jiangsu Sanpu: PVC plant shutdown from Mar 31 (shift to ethylene sales), strategy adjustment → 50k tons/month impact Fujian Fujian Wanhua: Normal operation → No impact Guangdong Guangdong Tosoh: Shutdown from Apr 1, raw material shortage → 18k tons/month impact Guangxi Guangxi Huayi: 50–60% load from Mar 10, raw material shortage → 12k tons/month impact Summary Total capacity: 5.82 million tons/year Total monthly production impact: 220,000 tons   We have done chemical products for over 30years. Our products include PVC RESIN, CPE, PE WAX, PARAFFIN WAX, STABILIZER, ACR, TIO2 and so on. One-stop purchase can save your time. Welcome inquiries: 86-18539282682(wechat/whatsapp).

  PVC Spot Market & Futures Analysis (English Translation)   Domestic PVC spot market has seen another sharp rise in mainstream transaction prices, with the market exhibiting high volatility.   A comparison of price assessments is as follows:   North China: up 200 yuan/ton East China: up 200–250 yuan/ton South China: up 200–250 yuan/ton Northeast China: up 50 yuan/ton Central China: up 100 yuan/ton Southwest China: up 100 yuan/ton   In the morning session, producers’ ex-factory offers were relatively moderate and reasonable. However, after futures prices rose at noon, many producers suspended offers to prepare for price increases.   Spot prices rose slightly in the morning, with basis quotations available:   East China basis: May contract – (50, –100, –130) South China basis: May contract – (flat, +50) North China basis: May contract –220 Some in Southwest China: May contract – (320, –400)   Following the sharp rally in futures at noon, the spot market returned to chaotic quoting. Most traders closed offers and withdrew low prices from the morning; basis quotations also disappeared, and market participants turned cautious while waiting for further upward adjustments.   The spot market this week has been extremely dynamic, and the word “frenzy” is an apt description.   PVC Outlook   Futures   The PVC 2605 contract surged sharply again. On Wednesday, it hit a high of 5678, breaking above the upper Bollinger Band. The daily chart closed with a bullish Doji star.   Technically, the Bollinger Bands (13, 13, 2) are opening up significantly, with the middle and upper bands pointing upward.   Daily KD and MACD indicators show a clear golden cross, and the main contract hit a new high compared with previous levels, with a considerable gain.   The conflict in the Middle East has affected ethylene-based PVC monomers, and the supply-demand balance of PVC is shifting.   We maintain our previous view: short-term futures volatility will remain high and risky, with wide fluctuations. Further upside resistance should be monitored.   Spot   Futures have swung sharply and hit new highs, leading to divergent adjustments in spot prices.   In the morning, regional offers were rational: ex-factory prices in Inner Mongolia were around 5,000–5,050 yuan/ton, with reasonable quotations across consuming markets.   After futures rose at noon, the spot market entered a wait-and-see rally mode, with most traders considering upward adjustments.   The Middle East conflict has impacted PVC fundamentals:   Ethylene-based PVC producers including Tianjin Bohua, Guangxi Huayi, Yantai Wanhua, Tianjin LG, Guangzhou Tosoh, Qingdao Haijing have reduced or plan to reduce operating rates due to raw material constraints.   Sinopec Sanpu Chemical plans to shut down PVC production and shift to monomer sales.   Against this backdrop, ethylene-based PVC supply has contracted sharply.   Although calcium carbide-based PVC producers intend to raise operating rates amid recent price surges, the incremental supply will be limited.   Overall, the PVC spot market is expected to remain strong and volatile in the short term.

PVC Spot Market & Futures Trend Analysis The domestic PVC spot market has seen an extremely sharp surge in mainstream transaction prices, with chaotic market quotations. A comparison of estimated prices shows: - North China: up 900–1000 yuan/ton - East China: up 900–980 yuan/ton - South China: up 800–1000 yuan/ton - Northeast China: up 900–1000 yuan/ton - Central China: up 900–1000 yuan/ton - Southwest China: up 800–1000 yuan/ton   Upstream PVC producers made few official offers today; most suspended public quotations and adopted internal pricing or one‑off negotiated prices, with ex‑factory prices raised several times within the day. - Northwest China: heard at 5500–5870 yuan/ton - Shandong region: market ex‑factory quotes as high as 5930–6000 yuan/ton   Price movements were relatively mild in the morning, but the spot market became highly chaotic in the afternoon. Offers lacked solid benchmarks, mostly based on individual inventories and selected ex‑factory prices, with levels adjusted repeatedly throughout the session.   Futures closed limit up for the entire day. No point‑priced offers were seen in the spot market, with most transactions conducted at fixed prices.   PVC Outlook  Futures The PVC 2605 contract closed limit up on Monday. It briefly opened only for a short period in the afternoon before closing limit up again, with slight position reduction throughout the day. Prices gapped higher and broke well above the upper Bollinger Band. Technically, the Bollinger Bands (13, 13, 2) have widened sharply, and daily KDJ and MACD show strengthening golden crosses.   The major PVC contract continues to benefit from escalating tensions in the Middle East, with bullish momentum intensifying. At midday close, many commodity contracts hit the daily upward limit. Given the current trend, with the main PVC contract locked limit up, short‑term prices are expected to hit further highs.   Spot 1. Futures closed limit up all day, with the limit price of 5466 defended by over 120,000 lots, showing strong bullish sentiment. 2. The spot market has decoupled from futures and surged drastically, with chaotic fixed‑price offers adjusted several times a day. Ex‑factory prices even broke through the 6,000‑yuan mark.   This rare scenario—spot prices far exceeding futures—has rarely been seen in recent years. Even ex‑factory prices in Northwest China are well above the futures limit price. The spot market has entered a frenzy, with gains of 800–1000 yuan/ton.   International crude oil futures continued to surge amid escalating attacks by the US and Israel against Iran. The de facto closure of the Strait of Hormuz has disrupted oil supplies from the Middle East, triggering panic buying amid supply concerns, which continues to dominate market dynamics.   Overall, PVC spot prices will enter a period of chaotic and wide‑range volatility in the short term.   PVC Spread Arbitrage Analysis According to data from Duoduo Tu: On March 9, the domestic calcium carbide‑based PVC spot index was 5976.36, up 931.52 or 18.465%. The ethylene‑based PVC spot index was 6176.09, up 941.31 or 17.982%. Both indexes rose sharply, with the spread between ethylene‑based and calcium carbide‑based PVC at 199.73.   We have done chemical products for over 30years. Our products include PVC RESIN, CPE, PE WAX, PARAFFIN WAX, STABILIZER, ACR, TIO2 and so on. One-stop purchase can save your time. Welcome inquiries: 86-18539282682(wechat/whatsapp).  

PVC spot market       The mainstream transaction price trend in the domestic PVC market continues to diverge, with different trends in the morning and afternoon. In terms of valuation comparison, the North China region has increased by 10 yuan/ton, the East China region by 10-20 yuan/ton, the South China region by 30 yuan/ton, the Northeast region by 30-60 yuan/ton, the Central China region by 0-30 yuan/ton, and the Southwest region by 30-50 yuan/ton. The ex factory prices of upstream PVC production enterprises have remained stable, and some enterprises have begun to tentatively increase their quotations by 20-30 yuan/ton. The futures market saw a consolidation of futures prices in the afternoon, causing the spot market to maintain the same early morning quotes as yesterday, with some high points even offering slight discounts. However, after the afternoon price rose, the low-end prices in the market disappeared, and some merchants raised prices slightly. The basis adjustment in various regions was not significant, but the point price advantage disappeared after the futures price rose. Among them, the 05 contract - (100, -170, -210) in the South China region, the 05 contract - (50, -100) in the South China region, and the 05 contract (350, -380, -450) in the North region. Individual 05 contracts in the southwest region - (300, -500). The spot market, stimulated by the rise in prices, has broken free from the previous sluggish situation, especially last week, and the market has gradually become active.   PVC future market forecast In terms of futures: After a narrow consolidation of the PVC2605 contract futures market, it continued to show a relatively significant increase in the afternoon session and closed higher at the end of the day, similar to yesterday's futures price fluctuations. During the Tuesday trading session, the position was reduced by 58135 lots. In terms of trading volume, the long position was tied at 25.8%, while the short position was tied at 25.9%. Both long and short positions left the market. The consecutive two-day sharp rise in futures prices has caused a change in the technical closing line. Today's futures prices continue to show a long bearish candlestick, with the Bollinger Bands (13, 13, 2) rapidly narrowing in three tracks. The KD line at the daily level is the first to cross, and the MACD line's dead cross trend has narrowed. The trend of the futures price, as we expected yesterday, achieved a breakthrough in the first range of 4900-4960. Observation of short-term fluctuations in futures prices: After the rise, the upper space of 4950-5000 continues to break through. In terms of spot goods: Firstly, the international crude oil futures market prices have risen significantly in the external market, as the attacks on Iran by the United States and Israel have prompted shipping companies to avoid crossing the strategic strait of Hormuz. Iran's retaliatory attacks on major oil producing countries such as Saudi Arabia and Qatar have intensified market concerns about the possibility of more severe supply disruptions caused by ongoing conflicts. Yesterday, along with today's futures market, crude oil commodities saw a significant increase, and PVC futures prices in both markets also rose. At present, the fundamentals of PVC have slightly changed, especially in terms of downstream demand. With the recovery of demand from businesses returning to the market, it has been reported that export orders have been destroyed due to the increase in shipping costs, but this has not been confirmed. PVC production enterprises on the supply side still maintain a stable operating rate, and the Spring Festival maintenance has not yet begun. However, there is an expectation that Spring Inspection will alleviate inventory pressure on the supply side. Overall, in the short term, PVC spot market prices may continue to be slightly strong and mainly consolidating.   We have done chemical products for over 30years. Our products include PVC RESIN, CPE, PE WAX, PARAFFIN WAX, STABILIZER, ACR, TIO2 and so on. One-stop purchase can save your time. Welcome inquiries: 86-18539282682(wechat/whatsapp).

In the PVC processing industry, "white frost" is a vexing specter. It appears uninvited, damages appearance, affects performance, and often leaves no clear cause. Many attribute it to vague concepts like "moisture" or "exudation," but who exactly is exuding? Why is it exuding? Today, we'll uncover the truth. White frost isn't magic—it's a failed "internal stabilization" effort! In perfect PVC products, the resin, additives, and fillers should function as a stable and united community, permanently "fixed" in their respective positions after processing. The emergence of white frost signals a "defection" within this community—certain small molecules or incompatible components break free from the system's constraints, migrate, and accumulate on the surface.   I. The Primary Culprit: Formula Imbalance – The Breeding Ground for "Defectors" This is the most fundamental cause. When you add excessive amounts of, or substances that simply shouldn't be present – these "unstable molecules" – you are essentially planting the seeds of rebellion within the system. 1.  **Excessive or Inappropriate Stabilizers:**     *   **"Salting out" of Metal Soaps:** Substances like calcium stearate and zinc stearate are typically beneficial (acting as heat stabilizers and lubricants). However, if added in excess, or if the calcium/zinc ratio is off, they react with HCl released during PVC degradation, forming water-soluble salts like calcium chloride and zinc chloride. These salts are like "aliens" within the oily PVC matrix, facing extreme incompatibility. They are eventually forced out to the surface, forming a dry, powdery white residue. This is the most common and typical cause of "white frost." 2.  **"Escape" of Lubricants:**     *   This is especially true for external lubricants (such as PE wax, paraffin wax). Their designed nature is to be "intimate but not too close" with PVC, migrating to the surface during processing to form a lubricating layer. However, if overdosed, these excess lubricants don't have time to be "pulled back" into the matrix during cooling and simply freeze on the product's surface, forming a waxy, oily film (oil bloom). 3.  **"Migration" of Plasticizers (for flexible PVC):**     *   If plasticizers with too low a molecular weight, high volatility, or poor compatibility with PVC are chosen (such as some cheap substitutes), they behave like restless tenants. Over time, especially with temperature fluctuations, they slowly "leach" out of the polymer network, causing a sticky, oily surface accompanied by exudation. 4.  **"Exposure" of Fillers:**     *   Large amounts of fillers like calcium carbonate or talc, if not surface-treated (coated with stearic acid or coupling agents), have hydrophilic surfaces that bond weakly with the hydrophobic PVC matrix. These uncoated powders easily detach from the interface or exude, causing surface whitening and chalking.   **II. The Second Culprit: Process Control Failure – The Accelerator of "Defection"** Even with a perfect formula, poor processing conditions can open the door for "defection" and even actively drive it.   1.  **The Fault of Temperature:**     *   **Too High:** Excessively high barrel or mold temperatures not only cause PVC degradation (producing small molecules that can exude) but also promote excessive migration of lubricants and other additives.     *   **Too Low:** Inadequate plasticization prevents uniform dispersion of additives, creating localized enrichment zones that become future "strongholds" for exudation. 2.  **Improper Cooling (A Critical Step):**     *   **Cooling Too Slowly:** Prolonged exposure to high temperatures gives small molecule additives sufficient energy and time to migrate leisurely to the surface.     *   **Cooling Too Quickly/Unevenly:** This can "freeze" tremendous internal stress within the product. This stress acts like a continuous pushing force, actively driving unstable additives in the system towards the surface (especially at stress concentration points), dramatically accelerating the formation of white frost. 3.  **Insufficient Plasticization and Shear:** Inadequate mixing of materials also leads to localized poor compatibility, creating conditions for exudation.   **III. The Third Culprit: Catalysis by Raw Materials and Environment** 1.  **Raw Material Batch Variation:** Changes in the polymerization degree or porosity of the resin, or inconsistencies in the quality of the additives themselves (containing more low-molecular-weight substances), can disrupt the established balance. 2.  **Service Environment:** Temperature cycles (diurnal or seasonal variations) provide the thermodynamic driving force for migration. Contact with certain liquids or solvents can also induce surface components to be extracted.   **IV. The Truth Revealed: White Frost is the Manifestation of "Systemic Failure"** In summary, the appearance of white frost on PVC is essentially the result of the combined action of **"thermodynamic incompatibility"** and **"kinetic conditions permitting":**   *   **Thermodynamically:** Certain components are in excess in the formulation, or are fundamentally incompatible. They desire to escape. *   **Kinetically:** Improper processing conditions (especially cooling) provide the pathway, energy, and time for that escape.   Therefore, troubleshooting white frost is a systemic investigation: 1.  **First, examine the formula:** Is any additive (especially stabilizers, external lubricants)"pushing the limit"? Are the fillers "coated"? 2.  **Second, review the process:** Is cooling fast and uniform enough? Is the processing temperature controlled at a reasonably low level? 3.  **Finally, check raw materials and environment:** Has the batch changed? Are the service conditions exceed expectations?   We have done chemical products for over 30years. Our products include PVC RESIN, CPE, PE WAX, PARAFFIN WAX, STABILIZER, ACR, TIO2 and so on. One-stop purchase can save your time. Welcome inquiries: 86-18539282682(wechat/whatsapp).

PVC， Polyvinyl Chloride, also known as polyvinyl chloride in English, is one of the most widely used plastics in the world. From a microscopic perspective, it is a polymer compound formed by the polymerization reaction of vinyl chloride monomer (VCM). Simply put, it is a long-chain molecule composed of countless vinyl chloride small units "holding hands". PVC resin is in the form of white powder. It does not have the performance of direct processing and molding in practical applications. It is necessary to modify by adding various additives (such as plasticizers, stabilizers, lubricants, etc.) to obtain products with different properties, thereby forming diverse application forms (such as rigid pipes, flexible films, etc. are typical products).   PVC pipes: In addition to water supply and drainage, heating systems, they are also widely used for agricultural irrigation, industrial fluid transportation, etc. Its corrosion resistance enables it to adapt to fluids containing acidic and alkaline chemicals, and has a long service life, generally up to 50 years or more, with low maintenance costs. PVC sheet: In addition to ceiling and wall decoration, it can also be used to make partitions, storage cabinets, floors, etc. PVC flooring has the characteristics of wear resistance, slip resistance, fire resistance, and easy cleaning, and is widely used in public places such as shopping malls, hospitals, and schools. PVC doors and windows: Compared with traditional wooden and steel doors and windows, PVC doors and windows not only have good thermal and sound insulation performance, but also have good sealing performance, which can effectively reduce energy consumption. At the same time, it has strong anti-aging performance, is not easy to deform and fade, and has a long service life. PVC film can be divided into hard film and soft film according to different processing techniques and performance requirements. Hard film can be used to make packaging boxes, trays, etc; Soft film can be used not only for food, medicine, and cosmetics packaging, but also for shrink packaging, stretch packaging, etc. It can tightly adhere to products and provide good protection and preservation. It should be noted that PVC film used for food packaging needs to meet strict hygiene standards to ensure its safety. Medical devices such as infusion tubes and blood bags made of PVC not only have good biocompatibility and chemical corrosion resistance, but also have certain flexibility and strength, making them easy to operate and use. In the medical field, PVC materials are usually subjected to special treatment to remove any harmful substances they may contain, ensuring that they are harmless to the human body. In addition, PVC medical devices also have advantages such as easy disinfection and recyclability. Automotive parts: In addition to interior parts, PVC can also be used for sealing strips, hoses, etc. in cars. Sealing strips can play a role in waterproofing, dustproof, and sound insulation; Hoses can be used for fuel systems, cooling systems, etc. in automobiles. Toys: PVC toys have the characteristics of bright colors, diverse shapes, and low prices, and are deeply loved by children. But PVC materials used for making toys need to comply with relevant safety standards to avoid harm to children's health. Cable material: PVC, as the insulation layer of the cable, has good insulation performance, aging resistance, and mechanical properties, which can effectively protect the conductors inside the cable and ensure the safe operation of the cable. We have done chemical products for over 30years. Our products include PVC RESIN, CPE, PE WAX, PARAFFIN WAX, STABILIZER, ACR, TIO2 and so on. One-stop purchase can save your time. Welcome inquiries: 86-18539282682(wechat/whatsapp).

What is a stabilizer? In a broad sense, all chemical substances that can enhance the stability of solutions, colloids, solids, and mixtures can be referred to as stabilizers. It can slow down the reaction rate, maintain chemical equilibrium, reduce surface tension, and prevent substances from decomposing or oxidizing due to light and heat. Narrowly speaking, stabilizers are mainly used as reagents to maintain the stability of high polymers such as plastics, rubber, and synthetic fibers, and to prevent their decomposition and aging.   Why does PVC production require stabilizers? Because PVC is an amorphous white powder with a low degree of branching and poor stability to light and heat. When exposed to temperatures above 100 ℃ or prolonged sunlight, PVC will decompose and produce hydrogen chloride gas. And hydrogen chloride will further trigger the automatic catalytic decomposition of PVC, causing discoloration of PVC products and a rapid decline in their physical and mechanical properties.   We have done chemical products for over 30years. Our products include PVC RESIN, CPE, PE WAX, PARAFFIN WAX, STABILIZER, ACR, TIO2 and so on. One-stop purchase can save your time. Welcome inquiries: 86-18539282682(wechat/whatsapp).

1、 Characteristics of physical properties, models, and types of PE wax Physical parameters -Melting point: 90-140 ° C (depending on molecular weight and degree of oxidation); -Molecular weight: 500-5000 g/mol (low molecular weight polyethylene); -Density: 0.90-0.96 g/cm ³; -Viscosity (melt state): low to moderate, good fluidity; -Acid value (oxidized PE wax): 5-30 mg KOH/g (containing carboxylic acid groups after oxidation); -Color: White or light yellow granules/powder.   Processing and application in PVC plastics 1. Core role -External lubrication: Reduce friction between PVC melt and screws/molds to prevent mold sticking;    -Internal lubrication (oxidized PE wax): promotes sliding between PVC particles and improves plasticization uniformity;    -Demoulding ability: Enhance the surface gloss of the product and reduce scratches;   -Thermal stability assistance: reduces shear heat generation and prevents PVC decomposition.   We have done chemical products for over 30years. Our products include PVC RESIN, CPE, PE WAX, PARAFFIN WAX, STABILIZER, ACR, TIO2 and so on. One-stop purchase can save your time. Welcome inquiries: 86-18539282682(wechat/whatsapp).

1、 Introduction Chlorinated Polyethylene (CPE) is a polymer material obtained by chlorination modification of the main chain of polyethylene (PE). Its chlorination degree (chlorine content) is usually between 25% and 45%, giving it unique properties between rubber and plastic. CPE combines flexibility, weather resistance, flame retardancy, and chemical stability, making it a core material in fields such as construction, automotive, and wire and cable.   2、 Chemical Structure and Preparation Structural characteristics: CPE replaces hydrogen atoms on the PE chain with chlorine atoms, disrupting the original crystalline structure and forming amorphous regions, thereby enhancing elasticity and low temperature resistance.    Influence of chlorination degree: ● Low chlorine content (25% -35%): Excellent elasticity, suitable for rubber modification. Medium to high chlorine content (35% -45%): It combines flexibility and rigidity and is used for flame retardant materials.    Preparation process: Solution method: Chlorination in a solvent results in high purity of the product, but it is costly and suitable for laboratory use.    Suspension method: Using water as the medium, it is a mainstream industrial method with low cost, but it requires controlling the uniformity of chlorine distribution.   Solid phase method: Directly chlorinating PE powder, environmentally friendly but technically difficult, suitable for special CPE. We have done chemical products for over 30years. Our products include PVC RESIN, CPE, PE WAX, PARAFFIN WAX, STABILIZER, ACR, TIO2 and so on. One-stop purchase can save your time. Welcome inquiries: 86-18539282682(wechat/whatsapp).

1、 Shrinkage rate The form and calculation of shrinkage in thermoplastic molding are as described earlier, and the factors that affect the shrinkage in thermoplastic molding are as follows: During the molding process of thermoplastic plastics, due to the volume change caused by crystallization, strong internal stress, large residual stress frozen in the plastic part, and strong molecular orientation, the shrinkage rate is larger, the shrinkage range is wider, and the directionality is obvious compared to thermosetting plastics. In addition, after molding.  During the molding process of plastic parts, the molten material and the outer layer in contact with the surface of the mold cavity immediately cool down to form a low-density solid shell. Due to the poor thermal conductivity of plastic, the inner layer of the plastic slowly cools down to form a high-density solid layer with large shrinkage. So those with thick walls, slow cooling, and high-density layers will shrink more. In addition, the presence or absence of inserts, as well as the layout and quantity of inserts, directly affect the direction of material flow, density distribution, and shrinkage resistance. Therefore, the characteristics of plastic parts have a significant impact on the size and directionality of shrinkage.  The form, size, and distribution of the feed inlet directly affect the direction of the material flow, density distribution, pressure holding and shrinking effect, and forming time. If the feed inlet is directly fed or has a large cross-section (especially thick cross-section), the shrinkage is small but the directionality is large. If the feed inlet is wide and short, the directionality is small. Those close to the feed inlet or parallel to the direction of the material flow experience greater shrinkage. Molding conditions: The mold temperature is high, the molten material cools slowly, has high density, and shrinks greatly. Especially for crystalline materials, the shrinkage is greater due to their high crystallinity and large volume changes. The temperature distribution of the mold is also related to the internal and external cooling and density uniformity of the plastic part, which directly affects the size and directionality of the shrinkage of each part. In addition, maintaining pressure and time also have a significant impact on contraction, with high pressure and long duration resulting in smaller but more directional contraction. The injection pressure is high, the viscosity difference of the molten material is small, the interlayer shear stress is small, and the elastic rebound after demolding is large, so the shrinkage can also be reduced appropriately. The material temperature is high and the shrinkage is large, but the directionality is small. Therefore, adjusting factors such as mold temperature, pressure, injection speed, and cooling time during molding can also appropriately change the shrinkage of plastic parts. When designing the mold, the shrinkage rate of each part of the plastic part is determined based on the shrinkage range of various plastics, the wall thickness and shape of the plastic part, the form, size, and distribution of the feeding port, and then the cavity size is calculated according to experience. For high-precision plastic parts and when it is difficult to control the shrinkage rate, the following method is generally recommended: Design the mold: ① Take a smaller shrinkage rate for the outer diameter and a larger shrinkage rate for the inner diameter of the plastic part to leave room for correction after trial molding. ② Trial mold to determine the form, size, and forming conditions of the pouring system. ③ The size changes of the plastic parts that need post-processing must be determined after post-processing (measured 24 hours after demolding). ④ Adjust the mold according to the actual shrinkage situation. ⑤ Try molding again and adjust the shrinkage value slightly by changing the process conditions appropriately to meet the requirements of the plastic part. 2、 Liquidity Liquidity can be divided into three categories: ① good liquidity PA, PE, PS, PP, CA, and poly (4) methylsiloxane; ② Medium liquidity polystyrene series resins (such as ABS, AS), PMMA, POM, polyphenylene ether; ③ Poor liquidity PC, hard PVC, polyphenylene ether, polysulfone, polyarylsulfone, fluoroplastics. 1. The flowability of thermoplastic materials can generally be analyzed based on a series of indices such as molecular weight, melt index, Archimedean helix flow length, apparent viscosity, and flow ratio (process length/plastic part wall thickness). If the molecular weight is small, the molecular weight distribution is wide, the molecular structure regularity is poor, the melt index is high, the screw flow length is long, the apparent viscosity is small, and the flow ratio is large, then the flowability is good. For plastics of the same name, their instructions must be checked to determine whether their flowability is suitable for injection molding. 2. The flowability of various plastics also varies due to various molding factors, and the main influencing factors are as follows: ① When the temperature of the material is high, the flowability increases, but different plastics also have differences, especially PS (especially those with high impact resistance and MFR value) PP、PA、PMMA、 The flowability of modified polystyrene (such as ABS, AS), PC, CA and other plastics varies greatly with temperature. For PE and POM, temperature changes have little effect on their fluidity. So it is advisable to adjust the temperature during molding to control the fluidity of the former. ② As the pressure of injection molding increases, the molten material is subjected to greater shear force and its flowability increases, especially for PE and POM which are more sensitive. Therefore, it is advisable to adjust the injection pressure during molding to control flowability. ③ The form, size, arrangement, cooling system design, and flow resistance of the molten material (such as surface smoothness, channel section thickness, cavity shape, exhaust system) of the mold structure pouring system directly affect the actual flowability of the molten material in the cavity. Any factors that promote the molten material to lower temperature and increase flow resistance will result in a decrease in flowability. When designing molds, a reasonable structure should be selected based on the fluidity of the plastic used. During molding, factors such as material temperature, mold temperature, injection pressure, and injection speed can also be controlled to adjust the filling situation appropriately to meet the molding needs.   3、 Crystallinity Thermoplastic can be divided into two categories: crystalline plastics and amorphous plastics, based on the absence of crystallization during condensation. The so-called crystallization phenomenon refers to a phenomenon in which the molecules of plastic move independently and are completely in an unordered state from a molten state to a state where they stop moving freely, move in slightly fixed positions, and have a tendency to align into a regular model. As the appearance standard for distinguishing these two types of plastics, it depends on the transparency of the thick walled plastic parts. Generally, crystalline materials are opaque or semi transparent (such as POM), while amorphous materials are transparent (such as PMMA). However, there are also exceptions, such as poly (4) methylsiloxane being a crystalline plastic but having high transparency, and ABS being an amorphous material but not transparent. When designing molds and selecting injection molding machines, attention should be paid to the following requirements and precautions for crystalline plastics: ① The amount of heat required to raise the material temperature to the molding temperature is high, and equipment with high plasticizing capacity should be used. ② When cooling and recycling, a large amount of heat is released, so sufficient cooling is necessary. ③ The difference in specific gravity between the molten and solid states is large, leading to significant shrinkage during molding and the occurrence of shrinkage and porosity. ④ Fast cooling, low crystallinity, small shrinkage, high transparency. Crystallinity is related to the wall thickness of plastic parts, which results in slow cooling, high crystallinity, large shrinkage, and good physical properties. So crystalline materials must be controlled for mold temperature as required. ⑤ Significant anisotropy and high internal stress. Molecules that have not crystallized after demolding tend to continue crystallizing and are in an energy imbalance state, making them prone to deformation and warping. ⑥ The crystallization temperature range is narrow, which makes it easy for unmelted material to be injected into the mold or for the feeding port to be blocked.   4、 Thermally sensitive plastics and easily hydrolyzed plastics Heat sensitivity refers to the tendency of certain plastics to change color, degrade, and decompose when exposed to heat for a long time at high temperatures or when the cross-section of the feed inlet is too small and subjected to high shear forces. Plastics with this characteristic are called heat sensitive plastics. Such as hard PVC, polyvinylidene chloride, and vinyl acetate copolymers, POM， Polytrifluorochloroethylene, etc. Thermally sensitive plastics produce by-products such as monomers, gases, and solids during decomposition, especially some decomposition gases that can irritate, corrode, or be toxic to the human body, equipment, and molds. Therefore, attention should be paid to mold design, selection of injection molding machines, and molding. Screw injection molding machines should be selected, and the pouring system section should be large. The mold and barrel should be chrome plated, and there should be no corner sticking. The molding temperature must be strictly controlled, and stabilizers must be added to the plastic to weaken its thermal sensitivity.  Some plastics (such as PC), even if they contain a small amount of moisture, will decompose under high temperature and high pressure. This property is called easy hydrolysis and must be heated and dried in advance. 5、 Stress cracking and melt fracture Some plastics are sensitive to stress, prone to internal stress during molding, and are brittle and prone to cracking. Plastic parts can crack under external forces or solvents. Therefore, in addition to adding additives to improve the crack resistance of the raw materials, attention should be paid to drying the raw materials and selecting reasonable molding conditions to reduce internal stress and increase crack resistance. Reasonable shapes of plastic parts should be selected, and measures such as embedding should not be taken to minimize stress concentration. When designing the mold, the demolding slope should be increased, and a reasonable feeding and ejecting mechanism should be selected. During molding, the material temperature, mold temperature, injection pressure, and cooling time should be adjusted appropriately to avoid demolding when the plastic part is too cold and brittle. After molding, the plastic part should also be treated to improve its crack resistance, eliminate internal stress, and prohibit contact with solvents. When a polymer melt with a certain flow rate passes through a nozzle hole at a constant temperature and its flow rate exceeds a certain value, significant transverse cracks occur on the surface of the melt, which is called melt fracture and damages the appearance and physical properties of the plastic part. Therefore, when selecting polymers with high melt flow rates, the nozzle, sprue, and feed inlet cross-section should be increased to reduce injection molding speed and increase material temperature. 6、 Thermal performance and cooling rate  Various plastics have different thermal properties such as specific heat, thermal conductivity, and thermal deformation temperature. When plasticizing with high specific heat, a large amount of heat is required, and an injection molding machine with high plasticizing capacity should be selected. The cooling time of plastics with high heat deformation temperature can be short and demolding can be done early, but it is necessary to prevent cooling deformation after demolding. Plastics with low thermal conductivity have a slow cooling rate (such as ionic polymers, which have extremely slow cooling rates), so they must be fully cooled and the cooling effect of the mold must be strengthened. Hot runner molds are suitable for plastics with low specific heat and high thermal conductivity. Plastics with high specific heat, low thermal conductivity, low thermal deformation temperature, and slow cooling rate are not conducive to high-speed molding, and appropriate injection molding machines and strengthened mold cooling must be selected Various plastics are required to maintain an appropriate cooling rate based on their type characteristics and the shape of the plastic parts. So the mold must be equipped with heating and cooling systems according to the molding requirements to maintain a certain mold temperature. When the material temperature increases the mold temperature, it should be cooled to prevent deformation of the plastic parts after demolding, shorten the molding cycle, and reduce crystallinity. When the residual heat of plastic is insufficient to maintain a certain temperature of the mold, the mold should be equipped with a heating system to keep the mold at a certain temperature, in order to control the cooling rate, ensure fluidity, improve filling conditions, or control the plastic parts to cool slowly, prevent uneven cooling inside and outside thick walled plastic parts, and improve crystallinity. For those with good fluidity, large molding area, and uneven material temperature, heating or cooling may be used alternately or locally in combination depending on the molding situation of the plastic part. For this purpose, the mold should be equipped with corresponding cooling or heating systems. 7、 Hygroscopicity   We have done chemical products for over 30years. Our products include PVC RESIN, CPE, PE WAX, PARAFFIN WAX, STABILIZER, ACR, TIO2 and so on. One-stop purchase can save your time. Welcome inquiries: 86-18539282682(wechat/whatsapp).

Combining the core root causes of yellowing in PVC foam shoe soles, this analysis delves into the reasons behind PVC yellowing and preventive measures. By focusing on two key dimensions—"raw material control + process optimization"—it delivers a practical anti-yellowing solution that balances environmental sustainability with production efficiency. The specifics are as follows:   1. Select the right core raw materials to lay the foundation for anti-yellowing (source blocking) Prioritize the use of specialized high-temperature calcium-zinc thermal stabilizers: This is the core step for yellowing resistance. The preferred choice is environmentally friendly calcium-zinc thermal stabilizers specifically for footwear materials (e.g., Rongjia RJ-902, RJ-903), which offer excellent thermal stability, light initial coloring, and high whiteness. They can withstand high-temperature processing around 200°C, effectively preventing PVC resin decomposition and yellowing. Additionally, they reduce mold carbon buildup, decrease demolding frequency, and save energy and labor costs.  Select low-migration environmentally friendly plasticizers: Avoid phthalate-based plasticizers and prioritize the use of environmentally friendly, low-migration types such as DOTP and polyester-based plasticizers. If epoxy-based plasticizers are used, strictly control the dosage and adhere to the principle of "just enough," avoiding excessive amounts that may trigger yellowing.  Matching foaming agent and processing temperature: Select a foaming agent with the same decomposition temperature based on the processing temperature of PVC resin; Small batch testing must be conducted before production to ensure complete decomposition of the foaming agent, reduce residual amounts, and lower the risk of yellowing from the source. Optimize microsphere and regulator parameters: Based on the flowability requirements of the formula, accurately control the amount of microspheres used to avoid affecting material flow; Simultaneously selecting viscosity modifiers to ensure stable material flowability, uniform heating during processing, and reduced local degradation and yellowing. 2、 Optimize production processes and safeguard the key to anti yellowing (process protection) Segmented precise temperature control+timely cooling: Combining equipment characteristics and formula requirements, refine the temperature settings of each section of the screw, shorten unnecessary high temperature zones, and prevent excessive degradation of materials; Strictly control the temperature of the mold, immediately perform cooling treatment after processing, quickly dissipate residual heat inside the sole, and protect the integrity of the material structure.  Precise control of formula ratio+process sampling: Before production, the optimal ratio of stabilizer, plasticizer, and foaming agent is determined through professional calculation and small-scale testing to avoid yellowing caused by excessive or insufficient single raw materials; Regular spot checks are conducted during the production process to ensure stable formula ratios and eliminate the risk of yellowing at the process level. We have done chemical products for over 30years. Our products include PVC RESIN, CPE, PE WAX, PARAFFIN WAX, STABILIZER, ACR, TIO2 and so on. One-stop purchase can save your time. Welcome inquiries: 86-18539282682(wechat/whatsapp).

In the PVC processing, the adjustment of internal and external lubricants and the assessment of plasticization status are crucial for ensuring processing stability and product quality. Below are the detailed solutions:   1.  Adjustment methods for internal and external lubricants      The difference in function between internal and external lubricants -Internal lubricant: reduces friction between PVC molecular chains, promotes plasticization, and improves melt flowability (such as stearic acid, monoglycerides, etc.).     -External lubricant: reduces friction between the melt and processing equipment (screws, molds), delays plasticization, and prevents sticking to rollers or molds (such as paraffin, PE wax, etc.)   2. Adjustment principle -Premature/excessive plasticization: It is necessary to increase external lubricants or reduce internal lubricants to delay plasticization.    -Insufficient plasticization: It is necessary to increase internal lubricants or reduce external lubricants to promote plasticization.    -Temperature variation during processing:- When the temperature is too high, the external lubricant is prone to failure, and it is necessary to increase the dosage or choose high-temperature resistant varieties (such as oxidized polyethylene wax) -When the temperature is low, it is necessary to add internal lubricants or use processing aids (such as ACR). 3. Typical Adjustment Cases   -Rough surface of extruded pipe: Insufficient external lubrication may cause the melt to stick to the mold, requiring an increase in external lubricant (such as 0.1-0.3 phr of paraffin wax).    -Poor melt flowability: Insufficient internal lubrication, calcium stearate can be added at a rate of 0.2-0.5 phr.    -The product has precipitates: excessive amount of external lubricant needs to be reduced or replaced with a more compatible variety.   2、 Determination method of plasticization state 1. Observation of the appearance of the melt -Good plasticization: The melt is smooth, uniform, and free of unmelted particles or "raw materials".    -Insufficient plasticization: The surface of the melt is rough, with white particles or stripes.    -Excessive plasticization: The melt turns yellow, brittle, and even decomposes (with a pungent odor). 2. Torque rheometer testing -Plasticization time (T ₀): The time when torque starts to increase, reflecting the plasticization speed. If T ₀ is too short, external lubricant needs to be added. -Balanced torque: The stable torque value reflects the viscosity of the melt. Excessive torque may result in insufficient internal lubrication or excessive packing. 3. Surface quality of the product -Poor glossiness/flow marks: insufficient external lubrication or uneven plasticization.    -Bubbles/yellow lines: Excessive plasticization or decomposition, requiring temperature reduction or external lubricant. 4. Monitoring of processing parameters -Host current: If the current is too high (excessive plasticization), reduce internal lubrication or increase external lubrication; If the current is too low (insufficient plasticization), the opposite is true.     -Melt pressure: Large pressure fluctuations may lead to unstable plasticization due to unbalanced lubrication. 5. Laboratory testing -DSC (Differential Scanning Calorimetry): measures the melting peak temperature to determine the degree of plasticization. -Yellowing index: When the plasticization is excessive, the product is prone to yellowing, and the lubrication system needs to be adjusted. 3、 Precautions 1. Total amount control of lubricant: The total amount added is usually 1-3 phr, and excessive amount can lead to precipitation or a decrease in mechanical properties. 2. Synergistic effect: Stabilizers (such as lead salts, calcium zinc) may have inherent lubricity and should be included in the formula balance. 3. Gradual adjustment: Adjust the lubricant ratio no more than 0.2 phr each time, observe the processing stability before optimizing. 4. Environmental temperature impact: In summer, high temperatures require an increase in external lubricants, while in winter, low temperatures require an increase in the proportion of internal lubricants. By combining lubricant adjustment with multidimensional judgment of plasticization state, PVC processing technology can be effectively optimized, improving production efficiency and product yield.   We have done chemical products for 30 years. Our products include PVC RESIN, CPE, TIO2, PE WAX, PARAFFIN WAX, STABILIZER AND SO ON. Welcome inquiries. 86-18539282682

As an important fine chemical raw material, titanium dioxide is a widely used white inorganic pigment with substantial market demand. Key factors to consider when selecting titanium dioxide include the following:   1. Color Color is a crucial technical indicator for identifying pigments. Titanium dioxide is known as the "king of white pigments," and its color metric is brightness. Even for titanium dioxide with the same chemical composition, variations in production processes, raw materials, equipment, and technical levels can lead to differences in color. While hue primarily depends on chemical composition, more critical and often decisive factors include particle shape, size, particle size distribution, crystal form, and impurity content.   2. Covering Power  The optical essence of covering power stems from the difference in refractive indices between pigments and the surrounding medium. Rutile-type titanium dioxide has a refractive index of 2.71, while anatase-type has 2.55, making it the white pigment with the highest covering power. The covering effect primarily occurs due to light scattering caused by titanium dioxide or absorption resulting from the presence of colored substances. When the intensity of incident light diminishes, the covering phenomenon manifests. Therefore, the main factors determining the covering power of titanium dioxide, apart from chemical composition and crystal form, also include particle shape, particle size, and particle size distribution.   3. Coloring Power  Coloring power is a crucial performance indicator of titanium dioxide, referring to its ability to display its own pigment properties when mixed with another pigment. In other words, for white pigments, the lighter the color of the mixture after blending with a dark pigment, the stronger its coloring power (whitening power).   4. Oil absorption  Oil absorption is also an important pigment property of titanium dioxide, as it relates to the filling state of titanium dioxide in colorants and can indicate its dispersion performance in media. In the coatings industry, it is used to estimate the viscosity of coatings before mixing, guide formulation, and preliminarily calculate the pigment volume concentration (PVC).   5. Chemical composition The chemical composition of titanium dioxide determines its chemical properties, which are the main distinguishing factors between pigments. In addition to reflecting a series of pigment properties such as whiteness, color fading power, and oil absorption, it also plays a significant role in its application performance, such as weather resistance and dispersibility.   6. Light and weather resistance The light resistance and weather resistance of titanium dioxide are important indicators for measuring its application performance, and simply referring to its light resistance and weather resistance is meaningless. This indicator is only meaningful after applying titanium dioxide to relevant application fields such as automotive paint, profiles, etc. Therefore, the light resistance and weather resistance of titanium dioxide refer to its light resistance and weather resistance in a certain field. In addition, to measure the light resistance and weather resistance of titanium dioxide, it is necessary to ensure that the weather resistance of its application carrier is better than that of titanium dioxide. The main factors affecting the weather resistance index of titanium dioxide include its chemical composition, the chemical form of the coating material, crystal structure, and application formula.   7. Glossiness The glossiness of titanium dioxide is an important indicator for measuring its application performance. Usually, titanium dioxide does not have luster, and simply referring to its glossiness is meaningless. This indicator is only meaningful when titanium dioxide is applied to relevant application fields such as automotive paint, ink, profiles, masterbatch, etc.   8. Volatile matter The volatile matter of titanium dioxide is actually the water content. Due to the high energy and hydroxyl groups present on its surface, it always needs to adsorb a certain amount of water to reduce its surface energy. The amount of adsorbed water is related to the surface organic treatment of titanium dioxide and the humidity and temperature of the surrounding environment during storage. The volatile content of titanium dioxide powder cannot determine the quality of the product, but depends on its application system. In general, the level of volatile matter in water-based systems has little effect on application, but for oil-based systems and polyolefin systems, it is required that the lower the volatile matter, the better, because high volatile matter will affect its dispersion performance and product quality in the system.   9. Dispersibility Dispersibility, also known as grinding dispersibility or grinding wetting, is called water dispersibility when used in water as a medium, and oil dispersibility when used in solvent and other coating systems. The dispersibility index is an important application index for titanium dioxide. The quality of dispersibility not only affects the color fading power, covering power, oil absorption and other indicators of titanium dioxide pigments, but also affects the gloss and weather resistance of coating film formation or profile forming. When grinding and dispersing in paint production plants, the quality of dispersion directly affects the length of grinding and dispersion time, which is one of the important economic indicators in paint production. Moreover, if the grinding time is too long, it will increase equipment pollution and deteriorate product whiteness. In the production of plastic masterbatch or profiles, the dispersibility directly affects the cycle of replacing the machine head screen and the performance of the final product.   We have done chemical products for 30 years. Our products include PVC RESIN, CPE, TIO2, STABILIZER, PE WAX, PARAFFIN WAX, ACR AND so on. Welcome inquiries.

1. Overview of the Domestic PVC Market This month, the spot market price of PVC showed a fluctuating trend—rising, then falling, and then rising again—with a significant overall increase. The price adjustments in both the spot and futures markets within January expanded rapidly, increasing the risk exposure for futures participants. The spot market also exhibited frequent alternating trends, resulting in an exciting performance in both markets. The influencing factors for the spot and futures markets in January can be summarized as follows:  1. The price fluctuations of the January 2605 futures contract oscillated between the upper and lower Bollinger bands, with a single-day swing of 367 points on the 12th, including a limit-down low. The volatility was strongly driven by policy news, intensifying the rhythm-based trading risks and frequent adjustments that left participants confused.  2. On the supply side, the January ex-factory prices rose compared to the low period, boosting the production enthusiasm of chlor-alkali enterprises that had previously reduced operating rates. PVC plant operating rates increased, leading to a small rise in PVC supply.  3. On the demand side, downstream demand showed no significant changes during the month. Although the operating rates of downstream industries declined temporarily, they rebounded slightly by the end of the month. Given that there was still time before the Spring Festival, no widespread downstream shutdowns had been reported as of yet.  4. In terms of costs, the price of calcium carbide rose by 50-150 yuan/ton during the month, and crude oil prices also surged significantly.  5. On December 4, 2025, a letter soliciting opinions on the "Notice on the Implementation of Differential Electricity Prices by the Shaanxi Provincial Development and Reform Commission and the Shaanxi Provincial Department of Industry and Information Technology" was issued. According to regulations from the National Development and Reform Commission, the Ministry of Industry and Information Technology, and other departments, the electricity price for restricted capacity in seven industries (including ferroalloys, calcium carbide, caustic soda, cement, steel, yellow phosphorus, and zinc smelting) will be increased by 0.1 yuan per kilowatt-hour, while the price for eliminated capacity will be raised by 0.3 yuan per kilowatt-hour (with an additional 0.1 yuan for cement eliminated capacity and 0.2 yuan for steel eliminated capacity). The commodity index also surged sharply in early January after the New Year due to this news, with some products even hitting limit-ups.  6. The Ministry of Finance and the State Taxation Administration announced that effective April 1, 2026, the export tax rebates for certain products, including polyvinyl chloride (PVC), will be canceled. This includes pure PVC powder, plasticized PVC, and unplasticized PVC, meaning these products will no longer qualify for any export tax rebates after April 1, 2026. Prior to the policy adjustment, the export tax rebate rate for PVC was typically 13%. This news also triggered a limit-down on January 12, followed by a swift rebound to above 4,900, creating a dramatic market movement. Overall, both the futures and spot markets delivered a thrilling performance for the month. Comparing the end of the month to the beginning, spot prices showed the following increases: 130 yuan/ton in North China, 185 yuan/ton in East China, 185 yuan/ton in South China, 150 yuan/ton in Northeast China, 115-145 yuan/ton in Central China, and 170 yuan/ton in Southwest China.   2. Taiwan, China Plastics Shipping Schedule Quotation The FOB price of Taiwan, China Plastics PVC exports in February increased by 40 dollars/ton compared with January. The FOB price in Taiwan was 610 dollars, the CIF price in Chinese Mainland was 680 dollars, the CIF price in India was 680 dollars, and the CIF price in Southeast Asia was 635 dollars.   3. In terms of futures forecasting for the future the operation of PVC2601 contract futures prices has not yet broken away from the pattern of high and narrow adjustments. The futures prices were still consolidating horizontally during the Wednesday session, showing a slight trend of reducing positions. Both long and short positions have left, but the high point of the futures price has slightly decreased compared to yesterday, presenting a ten character star positive column throughout the day. On a technical level, the opening of the Bollinger Bands (13, 13, 2) continues to be flat, while the daily level KD line and MACD golden cross trend have narrowed. The adjustment of futures prices lacks policy and news stimulation, with small fluctuations and a lack of clear direction. The Wenhua Commodity Index is currently undergoing consolidation, and with the passage of time, the operation of futures prices may enter the pre holiday market. In the short term, the operation of futures prices is observed to be adjusted between the upper track of 4860-4960.   In terms of spot goods: As January draws to a close, the prices of the futures and spot markets have basically broken away from the bottom range compared to the previous period. Compared to the sluggish and bearish market in the fourth quarter of 25 years, the price trend of the futures and spot markets shows a trend of not being weak in the off-season. At present, there is still no significant change in the supply and demand level. The operating load of PVC plants is stable and high, basically around 7.9-8.1%. Although downstream demand is also affected by holidays, there may be considerations for stocking up before the Spring Festival. Both production and trading enterprises have demand. Therefore, the game between supply and demand lays the foundation for the price adjustment of the two markets before the Spring Festival. Without external factors and policy guidance, the PVC spot market may continue to adjust narrowly in the short term, slowly entering a market with prices but no market before the holiday.   We have done chemical products for 30 years. Our products include PVC RESIN, CPE, TIO2, PE WAX, PARAFFIN WAX, STABILIZER AND SO ON. Welcome inquiries: 86-18539282682