The main raw materials for gypsum production are natural gypsum containing calcium sulfate (also known as raw gypsum) or chemical by-products and waste residue containing calcium sulfate. The chemical formula is CaSO. 2h20, also known as dihydrate gypsum. Gypsum is usually prepared from natural dihydrate gypsum. The natural dihydrate gypsum is heated to 107-170 under dry condition. C. Take off part of the water is gypsum (also known as hemihydrate gypsum), this is building gypsum.

目前应用较多的是在建筑石膏中掺人各种填料加工制成各种石膏制品（源如纸面石膏板、纤维石膏板、石膏空心板、石膏装饰板、石膏砌块、石膏吊顶等），用于建筑物的内隔墙、墙面和篷顶的装饰装修等。

At present, it is widely used in building gypsum mixed with various fillers to make various gypsum products (such as paper gypsum board, fiber gypsum board, gypsum hollow board, gypsum decorative board, gypsum block, gypsum ceiling, etc.) for the decoration of internal partition wall, wall and roof of buildings.

石膏板具有长期徐变的性质，在潮湿的环境中更为严重，且建筑石百膏自身强度较低，又因其呈微酸性，不能配加强钢筋，故不宜用于承重结构度。为进一步改善石膏的耐水性以扩大其应用范围，可掺入水泥、粒化高炉矿渣、石灰、粉煤灰或有机防水剂，也可在石膏板表面采用耐水护面纸或防水高分子材料，采取面层防水保护等技术措施。

Gypsum board has the property of long-term creep, which is more serious in humid environment, and the strength of Shibai plaster is low. Because it is slightly acidic, it can not be reinforced, so it is not suitable for load-bearing structure. In order to further improve the water resistance of gypsum and expand its application scope, cement, granulated blast furnace slag, lime, fly ash or organic waterproof agent can be added, and water-resistant face paper or waterproof polymer material can be used on the surface of gypsum board to take technical measures such as surface waterproof protection.