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An in-depth analysis of high-polymerization suspension polyvinyl chloride systems, compounding properties, and global supply economics.
Polyvinyl chloride (PVC) is categorized extensively by its viscosity index or "K-value", which directly represents the mean molecular weight and degree of polymerization (DP). Resins featuring a K-value of 71 to 72 possess a degree of polymerization ranging from 1250 to 1400. In comparison to standard grade resins (such as K67 or K57), PVC K72-K71 resins exhibit significantly greater mechanical toughness, superior tensile strength, higher tear resistance, and lower thermal deformation rates.
The suspension polymerization process utilized in manufacturing PVC K72-K71 creates porous, uniform spherical grains. The key physical attribute of these resins is their outstanding plasticizer absorption capacity. Because high K-value PVC chains form extensive amorphous crystalline networks, they easily trap plasticizing agents like phthalates (DINP/DIDP) and eco-friendly alternatives (DOTP, ESBO, or citrates) within their structure. This minimizes the risk of plasticizer migration, ensuring long-term elasticity and stability in flexible PVC applications.
| Physical Property Specification | Standard Range (PVC K72) | Standard Range (PVC K71) | Test Methodology |
|---|---|---|---|
| K-Value (Viscosity Coefficient) | 71.5 - 72.5 | 70.5 - 71.4 | ISO 1628-2 (Cyclohexanone) |
| Degree of Polymerization (DP) | 1350 ± 50 | 1270 ± 50 | JIS K 6721 / Equivalent |
| Apparent Density (g/cm³) | 0.45 - 0.52 | 0.46 - 0.53 | ASTM D1895 |
| Volatiles / Moisture Content (%) | ≤ 0.30 | ≤ 0.30 | ISO 1269 |
| Plasticizer Absorption (g DOP/100g Resin) | ≥ 24.0 | ≥ 22.0 | ASTM D3367 |
| Sieve Residue (>0.25mm, %) | ≤ 2.0 | ≤ 2.0 | ISO 4612 |
In today's chemical market, demand for PVC K72-K71 is heavily driven by strict regulatory changes and the need for higher-performing materials. European REACH guidelines, RoHS directives, and international standards have pushed plastic compounders to transition away from traditional low-molecular-weight phthalates. As compounders move to safer, high-molecular-weight plasticizers like DOTP, they require resins with higher K-values to maintain standard mechanical properties.
China is a global leader in PVC production, utilizing both the traditional calcium carbide route and the modern ethylene route.山东普利斯 (Shandong Pulisi Chemical Co., Ltd.), backed by raw materials from major entities like the China National Petroleum Corporation, provides a highly reliable supply chain. Our strategic logistics hubs near key maritime networks and inland border crossings allow us to deliver high-quality PVC resin to manufacturers worldwide, avoiding the supply disruptions common in today's market.
"The convergence of raw materials from China's petrochemical hubs with advanced suspension polymerization technologies has made China-sourced PVC K72-K71 highly cost-effective and chemically consistent. Selecting a partner with ISO9001:2015 and BV certifications guarantees batch-to-batch structural integrity, reducing batch adjustments for global compounders."
High K-value PVC resins require precise processing conditions. During extrusion or injection molding, the higher viscosity of K72-K71 polymer melts increases internal shear heat. To prevent thermal degradation, processors must optimize their stabilization packages—often using mixed metal carboxylates, calcium-zinc (Ca-Zn) systems, or organic co-stabilizers.
Proper gelation (fusion) is critical for achieving optimal mechanical properties in finished products. Since K72-K71 has a high fusion temperature, processing temperatures must be tightly controlled across the extruder zones, typically between 165°C and 190°C. Utilizing twin-screw extruders with segmented heat control prevents premature decomposition while ensuring thorough compounding of the plasticizers, fillers, and lubricants.
From medical life-support systems to heavy-duty industrial components, discover the diverse applications of these high-performance polymers.
Used widely in high-spec automotive and industrial power cables. High K-value resins ensure excellent resistance to cracking, cold temperatures, and electrical degradation under heavy loads.
Meets the strict requirements for medical tubing, blood bags, and oxygen masks. Its high purity and low volatile levels keep medical equipment safe and biologically compatible.
Perfect for manufacturing complex automotive seals, weatherstripping, and interior trim. Excellent elasticity and resistance to UV aging help interior automotive parts last much longer.
Widely used in high-end upholstery, apparel, and transportation seating. Provides a soft feel, high tear resistance, and outstanding durability against wear and tear.
Ideal for chemical transfer hoses, pneumatic tubes, and high-pressure water lines. The long polymer chains in K72 protect hoses against burst pressure and repeated bending.
Used to construct roofing sheets, geomembranes, and pond liners. High K-value PVC handles environmental stress, ground movement, and water pressure without leaking or breaking down.
Established in 2006 (Stock Code: 307785), Shandong Pulisi Chemical Co., Ltd. focuses on petrochemicals, mining chemicals, feed chemicals, and pharmaceutical chemicals. At present, the company has established long-term and stable partnerships with Fortune Global 500 companies such as China National Petroleum Corporation and Saint-Gobain. We always take customer demand as the core orientation and provide tailored solutions to help customers strengthen their market competitiveness.
The company has passed ISO9001:2015 Quality Management System Certification and German BV Certification, and has been awarded multiple honors such as Foreign-Oriented Economic Enterprise, Alibaba Demonstration Base, and Contribution Enterprise. In 2023, the company successfully went public with stock code: 307785.
We uphold the corporate culture philosophy of "Customer First, Rapid Response; Striving as the Foundation, Efficient Collaboration; Integrity and Uprightness, Agile Adaptation." We focus on providing compliant and high-quality products and supporting services, and are committed to becoming a long-term and stable partner for customers.
Meanwhile, the company has established mature warehousing and distribution systems at key logistics hubs, including Qingdao Port, Tianjin Port, and Xinjiang border ports (Alashankou, Khorgos). We are able to provide flexible supply solutions according to customer needs to ensure timely order delivery. No matter where customers are located, Shandong Pulisi Chemical will safeguard their business development with professional service systems and efficient response capabilities.
We always adhere to the mission of "creating value for customers and making their products better," based on reputation and guaranteed by service. We look forward to strengthening cooperation with partners to create a future together!
Strict Statement: Shandong Pulisi has not established branches outside of Shandong Province. If there is any act of impersonating Shandong Pulisi, our company will reserve the right to pursue legal responsibilities.
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