... heat insulation 3. fire, water, sound proof 4. light weight, high strength, no shrinkage 1) Raw materialsgypsum powder, gypsum retaining paper, fiber ... insulation, heat insulation, moistureproof, fireproofs, water-resiatance, non-desulfuration, environmental protection, pure nature, non-radioactive; be used in hang ceiling, separating ... after receipt of the T/T deposit or L/C. high strength sheetrock