... Light own weight, high impact strength, sound insulation, fire proofing, water proofing, heat insulation. Features: 1. GMJ inorganic joist ... strength, low weight, thermal preservation, energy saving, fire proof, water proof, sound insulation, great power ... absorption%≤9Drying shrinkage%≤0.06Sound insulationdB≥45Ultimate fire resistancemin<90Ultimate flaming retardantA-class non-combustible ...