Overview
PC2805 is a high-grade polycarbonate resin known for its balance of strength, clarity, and heat resistance. It belongs to the thermoplastic polymer family and is widely used in industries requiring durable and transparent materials. Compared to standard PC grades, PC2805 offers enhanced processing stability, making it suitable for precision molding applications. Polycarbonates like PC2805 are synthesized via interfacial polymerization of bisphenol A (BPA) and phosgene. The '2805' designation typically refers to specific viscosity and molecular weight parameters optimized for injection molding and extrusion processes. Manufacturers often select this grade for its consistent flow characteristics and reduced internal stresses in finished products.
Physical and Chemical Properties
PC2805 exhibits a glass transition temperature (Tg) of about 145-150°C, with continuous use temperatures up to 120°C. Its light transmittance reaches 88-91% in clear formulations, comparable to optical glass. The material maintains dimensional stability across a wide temperature range (-60°C to +135°C), with a coefficient of thermal expansion of 65-70 × 10⁻⁶/°C. Chemically, PC2805 demonstrates good resistance to diluted acids, oils, and aliphatic hydrocarbons. However, it is susceptible to strong alkalis, aromatic solvents, and certain halogenated compounds. Environmental stress cracking resistance (ESCR) can be improved through copolymer modifications or additives. The material achieves UL94 V-2 flammability rating without flame retardants.
Main Applications
In automotive lighting systems, PC2805 is used for headlamp lenses and LED light guides due to its optical clarity and heat resistance to halogen bulbs. The electronics industry utilizes it for transparent protective covers on displays and touch panels, where surface hardness is enhanced through coating technologies. Medical applications include sterilization-compatible instrument housings and fluid observation chambers. Industrial uses encompass safety goggles, machine guards, and inspection windows requiring impact resistance. Emerging applications include 5G antenna covers, where the material's dielectric properties prove advantageous for signal transmission.
Safety and Storage
As a non-hazardous material under normal conditions, PC2805 requires standard polymer handling precautions. Processing above 300°C may release trace bisphenol A vapor, necessitating local exhaust ventilation. Pellet storage should maintain relative humidity below 0.02% to prevent moisture absorption that could affect processing. Pre-drying at 120°C for 4 hours is recommended before injection molding. Bulk storage in sealed containers with desiccant prevents yellowing from UV exposure. Recycled material should be limited to 20-30% content for critical optical applications to maintain clarity. Spills can be collected mechanically without special chemical treatment.
B2B Procurement Guide
Industrial buyers should specify optical grade (low yellow index) or UV-stabilized versions for outdoor applications. Key procurement parameters include melt flow rate (typically 10-15 g/10min at 300°C/1.2kg), yellowness index (<1.5 for premium grades), and residual stress characteristics. Leading manufacturers include Covestro (formerly Bayer MaterialScience), SABIC, and Mitsubishi Engineering-Plastics. Minimum order quantities often range from 500kg for standard grades to 1MT for specialty formulations. Request certificates of analysis for lot-to-lot consistency in molecular weight distribution and thermal stability. Consider regional availability - Asian suppliers may offer cost advantages but verify compliance with EU REACH or US FDA regulations if applicable.
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