... preventing. 2.Firerproof,waterproof. 3.Green Products,low cots Calcium silicate ceiling tile is mainly made from silicious material, ... silicate, quartz sand, plant fiber, etc.Fireproofing features: Incombustible A-class material (GB8624-1997)Refractory High-point: 4.0 hours ... (GB/T7019-1997)Radioactivity: In line with the standard, A-class product, no pollution in productionPull-out strength of screw ...