The raw materials of gypsum production are mainly natural gypsum containing calcium sulfate (also known as raw gypsum) or chemical byproducts and waste residue containing calcium sulfate. The chemical formula is CaSO. 2h20, also known as dihydrate gypsum. Natural dihydrate gypsum is often used to prepare gypsum. Natural dihydrate gypsum was heated to 107-170 under dry condition. C. Take off part of the water to get anhydrite (also known as hemihydrate gypsum), which is building gypsum.

目前應(yīng)用較多的是在建筑石膏中摻人各種填料加工制成各種石膏制品（源如紙面石膏板篇胰、纖維石膏板泳唇、石膏空心板、石膏裝飾板殃描、石膏砌塊夜勋、石膏吊頂?shù)龋糜诮ㄖ锏膬?nèi)隔墻拳笨、墻面和篷頂?shù)难b飾裝修等趋大。

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

石膏板具有長(zhǎng)期徐變的性質(zhì)，在潮濕的環(huán)境中更為嚴(yán)重咏肠，且建筑石百膏自身強(qiáng)度較低袭靶，又因其呈微酸性，不能配加強(qiáng)鋼筋威恼，故不宜用于承重結(jié)構(gòu)度品姓。為進(jìn)一步改善石膏的耐水性以擴(kuò)大其應(yīng)用范圍，可摻入水泥箫措、粮贡福化高爐礦渣、石灰斤蔓、粉煤灰或有機(jī)防水劑植酥，也可在石膏板表面采用耐水護(hù)面紙或防水高分子材料，采取面層防水保護(hù)等技術(shù)措施弦牡。

Gypsum board has the property of long-term creep, which is more serious in humid environment. Moreover, the strength of building stone paste is low. Because it is slightly acidic, it can not be equipped with reinforced steel, so it is not suitable for bearing structure. In order to further improve the water resistance of gypsum and expand its application range, cement, granulated blast furnace slag, lime, fly ash or organic waterproof agent can be added. Water resistant face protection paper or waterproof polymer material can be used on the surface of gypsum board, and the surface waterproof protection measures are taken.