... the upgrade product of calcium silicate board.Major Element:Natural plant fiber, magnesium sulphate aluminium cement, glass fiber cloth, expanded perlite. Fire ResistanceIncombustibility ... Insulation>46dbRadioactivity<1.0lRa,<1.0lrAsbestosAsbestos freeFormaldehyde releaseNo formaldehydeFeatures/Meritswaterproof, fireproof, termite proof, lighter, flexional, easily to be shaped, perforated,bended ...