Overview
Polypropylene Random Copolymer (PP-R) is a thermoplastic polymer derived from propylene monomers with small amounts of ethylene randomly incorporated into the polymer chain. This molecular structure enhances flexibility and impact resistance compared to homopolymer polypropylene (PP-H). PP-R is widely recognized for its balance of mechanical strength, thermal stability, and chemical resistance, making it a staple in industries ranging from construction to healthcare. PP-R is produced via copolymerization using Ziegler-Natta or metallocene catalysts. The ethylene content (typically 1–7%) determines properties like transparency and低温韧性. Its versatility allows for extrusion, injection molding, and blow molding, catering to diverse manufacturing needs.
Physical and Chemical Properties
PP-R exhibits a semi-crystalline structure with a melting point range of 130–170°C, depending on ethylene content. Its density (0.89–0.91 g/cm³) is lower than many plastics, contributing to lightweight applications. The material shows exceptional resistance to acids, alkalis, and organic solvents, though it is susceptible to oxidation at high temperatures without stabilizers. Key mechanical properties include a tensile strength of 25–35 MPa and elongation at break of 200–600%. PP-R also demonstrates low moisture absorption (<0.01%), ensuring dimensional stability in humid environments. Its thermal conductivity is approximately 0.22 W/m·K, suitable for insulating piping systems.
Main Applications
PP-R is predominantly used in pressurized hot and cold water piping systems due to its耐高温性 (up to 95°C continuously) and corrosion resistance. Its smooth inner surface minimizes scaling, ensuring long-term flow efficiency. In packaging, PP-R films and containers are favored for food safety compliance and microwaveability. The automotive industry utilizes PP-R for battery casings, interior trims, and under-the-hood components, leveraging its vibration damping and weight savings. Medical applications include syringes and IV bags, where sterility and clarity are critical. Emerging uses include 3D printing filaments and eco-friendly textiles.
Safety and Storage
PP-R is classified as non-hazardous under normal handling conditions. Dust generated during machining may irritate respiratory tracts; PPE like masks and ventilation are recommended. The material is FDA-compliant for food contact and REACH-registered in the EU. Storage requires protection from direct sunlight to prevent UV degradation. Pellets should be kept in sealed containers at temperatures below 40°C to avoid agglomeration. Additives like antioxidants may be included to extend shelf life for specialized grades.
B2B Procurement Guide
When sourcing PP-R, specify parameters such as melt flow index (MFI: 0.5–25 g/10min), ethylene content, and regulatory certifications (e.g., NSF, ISO 15874 for pipes). Bulk prices vary by volume, with discounts common for orders exceeding 20 metric tons. Suppliers in Asia (China, South Korea) dominate production, offering competitive pricing, while European manufacturers emphasize high-purity grades. Audit suppliers for quality control measures like DSC (Differential Scanning Calorimetry) testing. Consider lead times (typically 4–8 weeks) and Incoterms (FOB, CIF) to optimize logistics costs.
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