Overview
Transparent white-based PC material is a specialized polycarbonate engineered for applications requiring both clarity and a subtle white hue. Unlike standard clear PC, it diffuses light evenly while maintaining high transmittance (up to 88%), making it ideal for backlit displays and lighting systems. Developed as an upgrade to opaque white plastics, this material combines the aesthetic appeal of milky transparency with PC’s mechanical strength. It is commonly extruded into sheets or injection-molded, with formulations often including additives for UV resistance or flame retardancy (e.g., UL94 V-0 rating).
Physical and Chemical Properties
The material exhibits a unique balance of optical and mechanical properties. Its light transmission is slightly lower than clear PC (typically 85–88%) due to white pigment dispersion, but it achieves superior light diffusion without yellowing. The tensile strength ranges from 55–75 MPa, with a Rockwell hardness of R118–R122. Chemically, it resists dilute acids, alcohols, and aliphatic hydrocarbons but may degrade in acetone or ammonia solutions. The thermal deformation temperature (HDT) under load is approximately 132–138°C at 1.82 MPa, outperforming many transparent plastics like PMMA.
Main Applications
In LED lighting, this PC variant is widely used for diffuser panels and bulb covers, where it softens harsh point-source light while maintaining energy efficiency. Automotive manufacturers employ it for instrument cluster covers and daytime running light lenses due to its weatherability. The medical sector utilizes it for translucent surgical tool housings and diagnostic equipment, capitalizing on its gamma-ray sterilizability. Consumer electronics brands prefer it for smartwatch casings and VR headset components, where aesthetics meet drop resistance.
Safety and Storage
While inherently non-toxic, machining processes like laser cutting may release trace bisphenol A (BPA) vapors—adequate ventilation is mandatory. Storage requires moisture-proof packaging (recommended RH < 30%) to prevent hydrolysis degradation, especially in pellet form. For food-contact applications, ensure compliance with FDA 21 CFR or EU 10/2011 standards. Bulk shipments should avoid prolonged exposure to temperatures above 50°C to prevent pellet agglomeration.
B2B Procurement Guide
Industrial buyers should prioritize suppliers offering batch consistency reports, particularly for color uniformity (Delta E < 1.5). Medical-grade purchases demand documentation of USP Class VI or ISO 10993-5 biocompatibility testing. For large-volume orders (20+ metric tons), negotiate MOQ discounts but verify the supplier’s capacity for post-processing services like anti-scratch coating. Sample evaluation should include accelerated aging tests (e.g., 500-hour QUV exposure) to confirm UV stability claims.
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