Polycarbonate Clear Twinwall Sheet, 6mm, 8mm Twin Wall Polycarbonate Sheets also known as Carbulon, sun sheet, is a new type of high strength quality, sound insulation, heat insulation, light transmission building materials. Because of its good impact resistance, sound insulation, lighting, flame retardant, UV (only for UV coating sunshine board) and easy cutting, machining performance, the advantages of high plasticity, are widely used in industrial and civil construction of daylighting, awnings, channel, ceiling, highway noise barriers, agricultural greenhouse, and advertising industry.