PC is a linear polyester carbonate, with alternating carbonate groups and other groups in its molecule. These groups can be aromatic, aliphatic, or a combination of both. Bisphenol A-type PC is the most important industrial product.Polycarbonate is not resistant to ultraviolet light or strong alkalis.PC is an almost colorless glassy amorphous polymer with excellent optical properties. High molecular weight PC resins have high toughness, with a cantilever beam notch impact strength of 600~900 J/m. The heat deflection temperature of unfilled grades is approximately 130°C, which can be increased by 10°C with glass fiber reinforcement. The flexural modulus of PC can reach over 2400 MPa, allowing for the processing of large rigid products. Below 100°C, the creep rate under load is very low. PC has poor hydrolytic resistance and is not suitable for products subjected to repeated high-pressure steam. The main performance defects of PC are insufficient hydrolytic stability, sensitivity to notches, poor resistance to organic chemicals and scratches, and yellowing upon long-term exposure to UV light. Like other resins, PC is susceptible to erosion by certain organic solvents.