... ,green,red,opal,brown etc. (3)Light transmission,UV protection polycarbonate twin-wall Features:1) Light transmission: the light transmission reaches 12%~92 ... , pass the test of china national standard GB8624-97.Belong to B1 level fire retardant,neither fire drop nor poisonous gas ... ,opal,brown etc.5) Color and size could be customized polycarbonate sheet twin-wall