Overview
Injection molded polyester, primarily PET or PBT, is a thermoplastic polymer valued for its mechanical strength, dimensional stability, and resistance to chemicals and wear. It is produced through polycondensation of terephthalic acid and ethylene glycol, followed by injection molding into precise shapes. Its versatility makes it a preferred material for industries ranging from packaging to automotive engineering. The injection molding process allows for high-volume production of complex parts with consistent quality, while additives can enhance properties like flame retardancy or UV resistance.
Physical and Chemical Properties
Injection molded polyester exhibits a crystalline structure when slowly cooled, contributing to its rigidity and heat resistance (up to 150°C for short periods). Its low moisture absorption (<0.5%) minimizes dimensional changes in humid environments, unlike nylon. Chemically, it resists alcohols, oils, and dilute acids but degrades in strong alkalis or at temperatures above 300°C. The material’s dielectric strength (20-25 kV/mm) suits electrical applications. Grades with 30% glass fiber reinforcement can achieve tensile strengths exceeding 150 MPa.
Main Applications
Packaging dominates PET use, with injection-molded jars and closures accounting for 30% of production. In automotive systems, PBT is used for ignition components and sensor housings due to its heat and fuel resistance. Electrical applications include circuit breakers and connector housings, where its insulating properties prevent short circuits. Consumer goods like kitchenware and toys leverage its food-safe grades (FDA-compliant) and colorfastness. Medical devices utilize sterilizable polyester for housings and surgical tools.
Safety and Storage
While non-toxic in solid form, molten polyester releases acetaldehyde (PET) or tetrahydrofuran (PBT), requiring fume extraction. Use PPE (gloves, goggles) during processing to avoid burns from 260-280°C melts. Store pellets in sealed containers to prevent moisture absorption, which can cause hydrolysis during molding. Shelf life exceeds 2 years in dry conditions. Recycled polyester must be tested for contaminants like PVC, which degrades at polyester’s processing temperatures.
B2B Procurement Guide
Specify intrinsic viscosity (IV) for PET (0.6-1.0 dl/g) or melt volume rate (MVR) for PBT to ensure flow characteristics match your mold design. Food-contact grades require USP Class VI or EU 10/2011 certification. For cost efficiency, consider post-industrial recycled content (up to 30% without significant property loss). Bulk orders (20+ metric tons) typically reduce costs by 10-15%. Lead times vary from 2 weeks (standard grades) to 8 weeks (custom formulations).
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