Polycarbonate (PC)[2]
Overview
Polycarbonate (PC) is an engineering thermoplastic prized for its unique combination of optical clarity, durability, and thermal stability. Developed in the 1950s, PC revolutionized industries requiring transparent materials that withstand mechanical stress and high temperatures. Its molecular structure features carbonate groups linked by bisphenol A, creating a robust polymer chain. As a raw material for transparent high-temperature plastic cups, PC outperforms alternatives like acrylic or PET by maintaining clarity above 100°C while resisting shattering. This makes it ideal for reusable drinkware, laboratory equipment, and food service containers subject to dishwashing or microwave heating.
Physical and Chemical Properties
PC exhibits exceptional light transmission (up to 90% visible light), rivaling glass but with 250x greater impact resistance. Its heat deflection temperature (HDT) of 130–140°C allows continuous use in hot environments without deformation. The material shows low moisture absorption (0.1–0.2%), ensuring dimensional stability in humid conditions. Chemically, PC resists dilute acids, oils, and alcohols but degrades in strong alkalis or aromatic hydrocarbons. UV exposure can cause yellowing unless stabilized with additives. The polymer’s inherent flame retardancy (UL94 V-2 rating) suits electrical applications.
Main Applications
Beyond high-temperature transparent cups, PC dominates markets requiring safety and clarity. It’s used in riot shields, aircraft windows, and LED light covers where breakage risks exist. The electronics industry employs PC for smartphone cases, laptop housings, and optical media (CDs/DVDs). Medical applications include autoclavable surgical instruments and IV connectors. Automotive uses range from headlight lenses to sunroof panels. Recent innovations include antimicrobial PC grades for healthcare settings and glass-fiber reinforced variants for structural components.
Safety and Storage
Food-contact PC must meet FDA 21 CFR or EU 10/2011 standards to ensure minimal bisphenol A migration. Industrial-grade PC should be handled with dust masks during machining to avoid respiratory irritation. Sheet materials require protective film to prevent surface scratches during transport. Storage recommendations include keeping pellets or sheets in original packaging below 30°C with <50% humidity. Prolonged UV exposure degrades mechanical properties, necessitating dark storage or UV-blocking bags for outdoor-use grades.
B2B Procurement Guide
When sourcing PC for high-temperature cups, specify: 1) Melt flow index (MFI) 10–20 g/10min for injection molding balance 2) FDA-compliant grades for food safety 3) Hydrolytic stability if steam sterilization is required. Bulk buyers should negotiate pricing tiers at 1-ton increments. For optical clarity, request transmission haze <1%. Consider copolymer PC (e.g., PC/PET blends) for enhanced chemical resistance in industrial settings. Always request material certification sheets with key parameters like yellowness index (YI) and Vicat softening temperature.
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