Overview
Bisphenol A Polycarbonate (PC) is a thermoplastic polymer synthesized via the reaction of bisphenol A (BPA) and phosgene or diphenyl carbonate. It is renowned for its exceptional mechanical properties, including high impact resistance and optical clarity, making it a preferred material for engineering applications. PC is processed via injection molding, extrusion, or blow molding, and its versatility allows for modifications with additives like flame retardants or UV stabilizers. First commercialized in the 1950s, PC has evolved to meet stringent industry standards, particularly in electronics and automotive sectors. Its ability to withstand temperatures up to 135°C without significant deformation further enhances its utility in high-performance environments.
Physical and Chemical Properties
PC exhibits a glass transition temperature (Tg) of about 147°C, contributing to its dimensional stability under thermal stress. Its light transmittance of 88–90% rivals that of glass, while its tensile strength ranges from 55–75 MPa. Chemically, PC is resistant to dilute acids and oils but vulnerable to alkalis and aromatic solvents. The material’s hydrolytic stability is moderate; prolonged exposure to humid conditions at elevated temperatures can lead to molecular degradation. Additives like phosphites are often incorporated to mitigate hydrolysis during processing. PC’s inherent flame retardancy (UL94 V-0 rating for certain grades) eliminates the need for additional fire-resistant coatings in many applications.
Main Applications
In electronics, PC is used for smartphone casings, LED light diffusers, and transparent display screens due to its dielectric properties and scratch resistance. The automotive industry employs PC in headlamp lenses, dashboard panels, and sunroofs, leveraging its lightweight nature and impact resilience. Medical applications include surgical instruments and dialysis membranes, where sterilizability and biocompatibility are critical. Consumer goods like reusable water bottles and safety goggles also utilize PC, though BPA-free alternatives are increasingly preferred for food-contact items. Emerging uses include 5G antenna housings, where low dielectric loss is paramount.
Safety and Storage
While PC is generally stable, processing above 300°C can release trace BPA, prompting regulatory scrutiny in food-contact applications. Proper ventilation is essential during machining to prevent inhalation of fumes. Finished products are considered safe under normal use conditions. Storage recommendations include keeping pellets in moisture-proof packaging to prevent hydrolysis. UV-sensitive grades should be shielded from direct sunlight to avoid yellowing. Industrial users must comply with regional regulations such as EU REACH or FDA approvals for specific applications.
B2B Procurement Guide
Buyers should specify requirements for optical clarity, impact strength, and thermal stability when sourcing PC. Medical-grade PC requires USP Class VI or ISO 10993 certification, while automotive grades may need ISO 9001 compliance. Bulk purchases (20+ metric tons) typically attract discounts of 10–15%. Supplier audits are advisable to ensure consistent quality, particularly for injection-molding grades. Alternatives like Tritan™ copolyester may be considered for BPA-sensitive applications. Lead times vary from 2–6 weeks, depending on customization and global supply chain conditions.
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