Twin-Wall Polycarbonate sheet (PC Hollow Sheet) is made of engineering plastic with high performance, and has many good characteristics, like high transparency, light weight, impact strength, sound insulation, Thermal Insulation, Flame Resistance, Aging resistance etc. It is a kind of plastic sheet with high technology and energy and environmental conservation. Nowadays it is used popular over the world and has inimitable advantage comparing with other architectural decoration materials. (Like glass, plexiglass etc). This product is widely applied to skylight of commercial building, factory and gym and sunshade, greenhouse for agriculture, livestock breeding and public service such as telephone booth, news-stand, railway etc, express way sound proofing and advertising decoration field.