Overview
Granular PVC compound is a processed form of polyvinyl chloride resin blended with additives like plasticizers, stabilizers, and fillers. The granular form facilitates easy handling, storage, and feeding into processing equipment compared to powder formulations. PVC compounds are engineered to meet specific performance requirements across various industries. As one of the most widely used thermoplastics, PVC offers an excellent balance of properties including chemical resistance, flame retardancy, and electrical insulation. The granular form is particularly favored for extrusion and injection molding processes where consistent flow properties are critical.
Physical and Chemical Properties
The physical properties of granular PVC compounds vary significantly based on formulation. Standard compounds typically exhibit tensile strength of 10-25 MPa and elongation at break of 100-300%. The material shows good resistance to acids, alkalis, and many organic solvents, though it may swell in some plasticizers and aromatic hydrocarbons. Thermal properties are formulation-dependent, with continuous use temperature ranging from -15°C to +60°C for flexible compounds and up to +80°C for rigid formulations. The material's inherent flame retardancy (limiting oxygen index ~45) makes it suitable for applications requiring fire safety.
Main Applications
In construction, granular PVC compounds are primarily used for pipe production (60-70% of the market), including pressure pipes, drainage systems, and conduit. Cable insulation and jacketing account for another 15-20% of consumption, benefiting from PVC's excellent dielectric properties and flame retardancy. The automotive industry utilizes PVC compounds for interior components like dashboard skins, door panels, and wire harnesses. Other applications include medical tubing, flooring materials (vinyl tiles), and consumer products such as credit cards and synthetic leather.
Safety and Storage
Granular PVC compounds should be stored in original packaging or sealed containers to prevent moisture absorption and contamination. Ideal storage conditions are below 30°C with relative humidity under 50%. Under proper conditions, shelf life typically exceeds 12 months. During processing, adequate ventilation is essential to prevent exposure to decomposition products, which may include hydrogen chloride gas above 140°C. Personal protective equipment including dust masks and gloves should be used when handling bulk material to minimize exposure to additives and dust particles.
B2B Procurement Guide
When procuring granular PVC compounds, buyers should clearly specify technical parameters including K-value (molecular weight indicator, typically 57-70), plasticizer content (0-60% phthalate or alternative), stabilizer type (lead, calcium-zinc, or tin-based), and filler percentage. Color requirements and UV stability should be detailed for outdoor applications. Quality assurance should include certificates for RoHS compliance, REACH registration, and application-specific testing (e.g., potable water approval for pipes). For large-volume purchases (20+ tons), consider negotiating price breaks and minimum order quantities with manufacturers.
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