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Water proof gypsum board use desulfurized high-purity gypsum powder as main material, mixed with fiber Water proof gypsum board use desulfurized high-purity gypsum powder as main material, mixed with fiber, proper quantity of additives and high efficiency organic hydrophobic agent of make board core. The surface paper is treated specially, the waterproof property of gypsum board is greatly improved and strengthened.It is fully accordance with the requirements of GB/T9775-2008/the client’s requirement.,It is widely used in toilet, kitchen, washing room and other damp places with much humidity variation. Specification Length(mm) Width(mm) Thickness(mm) 2400 1200 9.5/ 3/8" 2440/8' 1220/4' 12.0 12.7/1/2" Note: Other sizes upon your detailed request.