... absorbing.It has long durability DongFangShengShi Ceiling Board is a light board material with no toxic made through high ... silicate, quartz sand, plant fiber, etc. Fire safety characteristics: A-level non-combustible materials (GB8624-1997) Fire-resistant limit: 4 hours ... (GB/T7019-1997) Radioactivity: measure up to the standard;A-type products, production, marketing and use without the environmental ...