... and easy to install 4.Low thermal insulation Fireproof material calcium silicate board ceiling board JRCSB51Physical Properties ... gray(other color also supplied)Raw ingredients Siliceous material,calcareous material,plant fiber(no asbestos) Density 1.0 ... fier-proof, water-proof, moisture-proof, sound insulation, heat insulation, thermal insulation,anti-shock,anti-impact,anti-aging,corrosion-resistang ...