Overview
Transparent PC plastic sheet is an amorphous engineering thermoplastic derived from bisphenol A (BPA) and phosgene. It combines glass-like clarity (up to 90% light transmission) with exceptional impact resistance—250 times stronger than standard glass. The material is supplied in rolls for ease of handling in industrial applications. Polycarbonate’s molecular structure features carbonate groups linked by aromatic rings, granting thermal stability (continuous use up to 120°C) and dimensional stability. Unlike acrylic (PMMA), PC sheets maintain toughness in cold environments (-40°C), making them suitable for diverse climates.
Physical and Chemical Properties
PC sheets exhibit a Rockwell hardness of R118–R122 and a refractive index of 1.584, comparable to optical glass. Their tensile strength ranges from 55–75 MPa, with elongation at break of 80–150%. The material has low water absorption (0.1–0.2% over 24 hours), minimizing warping in humid conditions. Chemically, PC resists dilute acids, oils, and alcohols but may degrade in strong alkalis or aromatic hydrocarbons. UV-resistant grades incorporate stabilizers like benzotriazoles to prevent yellowing, extending outdoor service life to 10+ years. Flame-retardant variants achieve UL94 V-0 ratings without compromising transparency.
Main Applications
In construction, PC rolls serve as vandal-proof glazing for bus shelters and noise barriers, replacing glass in hurricane-prone regions. The automotive industry uses 0.5–3mm thick films for headlight lenses and instrument panel covers due to their 145°C heat deflection temperature. Electronics manufacturers employ anti-static PC sheets for touchscreen protectors and LED light guides, leveraging their dielectric strength (15–40 kV/mm). Medical-grade rolls meet ISO 10993 standards for surgical instrument trays. Emerging applications include flexible OLED substrates and AR/VR optical waveguides requiring nano-imprint precision.
Safety and Storage
While PC is non-carcinogenic (FDA/EC compliance for food contact), dust from machining requires NIOSH N95 mask protection. Thermal cutting should occur in ventilated areas to avoid trace bisphenol emissions above 300°C. Rolls must be stored horizontally on flat pallets to prevent edge curling. Protective polyethylene interleaving prevents surface scratching during transport. Relative humidity should be maintained below 60% to avoid moisture absorption, which can cause bubbling during thermoforming.
B2B Procurement Guide
Specify optical grade (e.g., Bayer Makrolon AL) for display applications versus general-purpose grades (e.g., Sabic Lexan 9034). Critical parameters include haze (<1% for clear sheets), yellowness index (ΔYI <2 after 1000h QUV testing), and thickness tolerance (±5% industry standard). Bulk buyers should request mill certificates verifying melt flow rate (MFR 6–20 g/10min at 300°C/1.2kg) and residual stress (analyzed via cross-polarized light). For cost-sensitive projects, consider China-sourced rolls from Covestro or Teijin partners, but insist on RoHS/REACH documentation. Sample testing for ESCR (Environmental Stress Cracking Resistance) with isopropanol is recommended.
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