... install 4.Low thermal insulation Insulation board fireproof material calcium silicate board ceiling board JRCSB92Physical Properties ... gray(other color also supplied)Raw ingredients Siliceous material,calcareous material,plant fiber(no asbestos) Density 1.0 ... highstrengh, fier-proof, water-proof, moisture-proof, sound insulation, heat insulation, thermal insulation,anti-shock,anti-impact ...