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PVC Resin SG-3 is a high-molecular-weight suspension-grade polyvinyl chloride homopolymer, characterized by a K-Value of 71–72 and an average degree of polymerization of 1,250–1,370. With the CAS number 9002-86-2, it appears as a white free-flowing powder produced via the suspension polymerization process — the most widely adopted PVC production method worldwide.
SG-3 strikes the optimal balance between mechanical strength and processability. Its high molecular weight delivers superior tensile strength, impact resistance, and long-term durability, making it the preferred resin grade for demanding rigid applications such as pressure pipes, structural profiles, and engineering sheets. It also offers excellent plasticizer absorption capacity, enabling flexible formulations when needed.
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With its high molecular weight and excellent mechanical properties, SG-3 is the backbone resin for rigid PVC products where structural integrity and durability are non-negotiable.
SG-3 is the primary resin for pressure and non-pressure PVC pipe systems, including water supply pipes, drainage and sewage conduits, electrical conduits, and industrial piping. Its high K-value ensures exceptional hoop strength, creep resistance, and long-term hydrostatic pressure performance under demanding service conditions.
In extruded window and door profiles, SG-3 provides the necessary weatherability, dimensional stability, and impact resistance for decades of outdoor exposure. It forms the structural backbone of energy-efficient uPVC fenestration systems used in residential and commercial construction.
SG-3 is used in calendered and extruded rigid PVC sheets for thermoforming applications — packaging trays, credit card stock, signage, and construction panels. Its high molecular weight delivers the melt strength required for consistent sheet extrusion and downstream forming.
When plasticized, SG-3's high absorption capacity (>26 g/100g) makes it suitable for flexible garden hoses, industrial tubing, and medical-grade flexible PVC products, offering a smooth surface finish and uniform wall thickness.
SG-3 serves as the base resin in PVC cable compounds, providing the matrix into which plasticizers (DOP, DOTP) and fillers are compounded. Its consistency and purity ensure reliable electrical insulation performance across power, building, and automotive cable applications.
