Polycarbonate(PC) is a kind of amorphous, odourless, non-toxic and highly transparent  thermoplastic engineering plastic. It has  good mechanical properties, especially the excellent shock resistance, tensile strength, bending strength and  compression strength. It’s  creep resistance and  steady size. It has good heat resistance and low temperature resistance and the stable mechanical properties in the wide temperature range. It can be long-term used in the temperature of -60℃-120℃. No obvious melting point. It is in liquation under 220~230 ℃. As the rigidity of Molecular chain, the resin melt  viscosity is high. The bibulous and shrinkage rates are small. It is self-extinguishment. The weather fastness is good. It’s oil  and acid resistance. ·Precautions for use： ·To improve the value and service life of the products, the following ways of operation should be avoided.