... materials, and adding some fiber, stickiness glue etc. It is fireproof, sound insulation, heat resistance, light weight, high intension, besides, it ... , digged. The board is widely used for inner wall, ceiling, partition.1.TYPE :A: Standard boardB: Fire-resistant boardC: Water resistant ... Ir ≤ 1.3 (grade A) 0.1Note GB ISO Drywall Partition