Overview
Transparent Polycarbonate (PC) is a versatile engineering plastic developed by SABIC and other manufacturers. It combines glass-like clarity with superior impact strength—up to 250 times that of glass—making it ideal for safety-critical applications. SABIC’s Lexan® brand is globally recognized for consistent quality and innovation in PC formulations. PC is synthesized via interfacial polymerization of bisphenol A (BPA) and phosgene or non-phosgene processes. Its amorphous structure contributes to optical transparency (up to 90% light transmission) and ease of thermoforming or injection molding.
Physical and Chemical Properties
PC exhibits a unique balance of mechanical and thermal properties. Its tensile strength ranges from 55–75 MPa, with a Rockwell M hardness of ~70. The material maintains dimensional stability between -40°C to +135°C, outperforming many transparent plastics like PMMA. Chemically, PC resists dilute acids, alcohols, and non-polar solvents but is susceptible to strong alkalis and aromatic hydrocarbons. UV resistance varies by grade; unmodified PC yellows under prolonged sunlight exposure unless treated with stabilizers.
Main Applications
In automotive industries, PC is used for headlamp lenses, sunroofs, and dashboards due to its lightweight and crash resistance. Electronics benefit from its dielectric properties in smartphone screens and LED diffusers. The medical sector uses sterilizable PC for surgical instruments and incubators. Construction applications include riot shields, soundproof windows, and greenhouses where safety and weatherability are paramount.
Safety and Storage
While PC is generally safe, dust from machining requires ventilation due to potential respiratory irritation. Food-contact grades must comply with FDA or EU 10/2011 standards. Store PC sheets or pellets in original packaging away from moisture. Avoid stacking heavy loads to prevent stress cracking. For long-term storage, use climate-controlled warehouses to prevent hydrolysis degradation.
B2B Procurement Guide
When sourcing PC, prioritize suppliers with ISO 9001 certification and batch traceability. Key specifications to verify include melt flow index (MFI), yellowness index (YI), and Izod impact strength. For prototyping, consider buying small quantities of extruded sheets (3–10mm thickness). Bulk purchases of injection molding pellets typically require MOQs of 1–5 tons. Negotiate pricing based on annual volume commitments and logistic requirements.
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