Overview
Recycled PBT is a reprocessed engineering thermoplastic derived from post-industrial or post-consumer waste. It retains most properties of virgin PBT while offering cost savings and environmental benefits. The recycling process involves sorting, cleaning, and re-extruding PBT waste into uniform pellets. As a semi-crystalline polymer, recycled PBT maintains excellent dimensional stability and resistance to creep, making it suitable for precision components. Its adoption aligns with circular economy goals, reducing landfill waste and carbon footprint in industries like automotive and electronics.
Physical and Chemical Properties
Recycled PBT exhibits tensile strength of 50–60 MPa and flexural modulus of 2,300–2,800 MPa, comparable to virgin material. Its heat deflection temperature (HDT) ranges 150–200°C, depending on additives. Electrical properties include dielectric strength of 20–25 kV/mm. Chemically, it resists fuels, oils, and weak acids but degrades in strong alkalis. Moisture absorption is low (0.1–0.3%), though higher than virgin PBT due to polymer chain scission during recycling. Processability remains good with injection molding temperatures of 240–260°C.
Main Applications
In automotive systems, recycled PBT is used for sensor housings, ignition components, and headlight reflectors due to heat resistance. Electronics manufacturers employ it for connectors, circuit breakers, and relay bases where flame retardancy (UL94 V-0 rating) is critical. Industrial applications include gears, pump housings, and conveyor system parts. Consumer goods range from power tool housings to kitchen appliance components. Some grades incorporate glass fibers (15–30%) for enhanced mechanical performance in load-bearing applications.
Safety and Storage
Recycled PBT is generally non-hazardous under normal conditions but may emit trace volatiles during high-temperature processing (>280°C). Adequate ventilation is recommended in manufacturing facilities. Storage requires moisture-proof packaging (typically aluminum-lined bags) with desiccants. Pellets should be dried at 120°C for 3–4 hours before processing if exposed to humid environments. Shelf life is typically 12–24 months when stored properly.
B2B Procurement Guide
When sourcing recycled PBT, verify suppliers' material traceability and recycling certifications (e.g., ISO 14021). Key specifications to request include melt flow rate (MFR) data (typically 10–50 g/10min at 250°C/2.16kg), black spot counts (<10 particles/kg), and mechanical property test reports. For automotive applications, confirm compliance with standards like ISO 1043-1. Bulk purchases (20+ metric tons) often secure 5–15% price discounts. Consider regional suppliers to reduce logistics costs, as PBT recycling facilities are concentrated in Europe, North America, and East Asia.
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