... center for quality Supervision&Testing of Fire Building materials, the material is rated as Class 1 according to QB8624-1997standard.10 ... :1)Impact strength: 850J/m2)Light transmission: 88%3)Specific gravity: 1200kg/m34)Coefficient of thermal expansion: 0.0655)Temperature: - ... 1.5mm-16mm2)Maximum width: 2100mm3)Length: No limit4)Specific gravity: 1200kg/m35)Color: Clear, blue, green, opal, brown, etc ...