... to 18mm 3) Bayer materials polycarbonate sheet for canopies pc sheet hollow sheetSpecifications:1) Thickness: 4mm, 6mm, 8mm ... liners, vehicles, notors boats, submarines and police glass shields.4. Telephone boths, advertising boards, light boxes ... : The shock strength of PC sheet is 250-300 times of that of ordinary glass,20 ... -30 times of PMMA.4. Fire Retardant: Pass the test of ...