PVC SG5 Supplier in China

PVC SG5 is a general-purpose rigid polyvinyl chloride resin produced by the suspension polymerization process. Its average degree of polymerization is 950–1100, the K-value is stable at 65–68, and the viscosity number ranges from 107–118 ml/g. With its moderate molecular weight, good processing flowability, and stable physical properties, PVC resin sg5 is widely used in the production of pipes, profiles, sheets, window and door frames, boards, and various industrial products.

As a thermoplastic resin polymerized from vinyl chloride monomer (VCM), PVC SG5 appears as a white powder, with an apparent bulk density ≥ 0.45 g/ml, volatile content (including moisture) ≤ 0.4%, and impurity particle count ≤ 16 pieces. With its balanced performance, it serves as a key intermediate material connecting upstream raw materials and downstream finished products. The main brands include Erdos, Zhongtai Chemical, Xinfa, Yihua Group, Xinjiang Tianye Group, etc.

Xinfa PVC resin for Sale — Xinfa PVC SG5

Item	Value	Description
K-value (Degree of Polymerization)	65–70	Moderate molecular weight, providing balanced flowability and mechanical properties
Ash Content	≤0.3%	Low impurities, ensuring smooth product surface
Chlorine Content	56–57%	Ensures hardness and chemical resistance
Viscosity (F-value)	65–75	Easy to process, suitable for injection molding and extrusion
Thermal Stability	Good	Can be processed at 160–190°C with heat stabilizers
Impact Strength	Medium	Suitable for general industrial applications, not for high-impact environments
Colorability	Excellent	Can be directly pigmented or colored during processing

Performance Characteristics of PVC SG5

1. Polymer Structure and Processing Adaptability

The suspension polymerization process gives PVC sg5 a loose and porous particle structure, enabling strong absorption capacity for additives. The plasticizer absorption rate is ≥19 g per 100 g of resin, allowing rapid and uniform absorption of plasticizers and stabilizers during processing. This improves mixing efficiency by over 30% compared with emulsion PVC. The degree of polymerization between 950–1100 achieves a balance between rigidity and processability, ensuring high mechanical strength while supporting extrusion, injection molding, and calendering processes. It also offers a wide processing temperature window of 160–190°C, providing excellent operational flexibility.

2. Mechanical Properties and Stability

This resin exhibits balanced mechanical strength. Unmodified rigid PVC resin sg5 has a tensile strength above 45 MPa and a flexural modulus greater than 3000 MPa, significantly higher than standard PP materials. It also offers excellent dimensional stability, with a molding shrinkage rate of only 0.5%–1.0%, ensuring precise assembly for pipes and profiles.

Due to optimized polymerization technology, gel particle count is controlled to ≤20 per 400 cm², and whiteness after heating at 160°C for 10 minutes is ≥78% (up to 80% for premium grades). With low residual VCM (≤3 ppm), it reduces product defects and meets safety and environmental requirements.

3. Environmental Resistance and Functional Characteristics

PVC SG5 has excellent chemical resistance, withstanding corrosion from hydrochloric acid, sulfuric acid (<30%), sodium hydroxide, and most salts at room temperature. It also provides high electrical insulation with a volume resistivity ≥10¹³ Ω·cm and operates in a temperature range of -15°C to 60°C, making it suitable for building and electrical applications. However, its thermal stability is poor without stabilizers—thermal decomposition begins above 100°C with HCl release. Therefore, heat stabilizers such as lead salts or calcium-zinc stabilizers must be added during processing.

Main Applications

As a general-purpose rigid PVC resin, this resin offers good processability, high rigidity, chemical resistance, and dimensional stability, making it widely used in:

Construction pipes (water pipes, drainage pipes, chemical pipes)
Profiles and window/door frames
Sheets and boards
Wires and cable insulation
Injection-molded industrial parts

Environmental Protection and Safety

PVC resin sg5 is an unplasticized rigid resin and contains no additional plasticizers.
It is recyclable and can be reused in non-food contact applications.
Prolonged exposure to high temperatures should be avoided to prevent decomposition and release of HCl fumes.
It is recommended to use heat stabilizers and processing additives during processing to enhance safety and extend product service life.