Chemical description:
Chemical-CaSO4. Molecular weight: 136.14. Solid white.
Density of 2.61 g / cubic centimeter.
Melting point of 1450 º C.

With two crystal water molecules known as the plaster or Shengshi Gao (CaSO4? 2H2O). Gypsum will be heated to 150-170 º C, most of the loss of crystal water, gypsum become mature (CaSO4? 1/2H2O). CaSO4 not solubility, and its Solubility was the first rise after the special situation of the lower. 10 º C, such as water solubility for 0.1928g/100g (with), 40 º C for 0.2097, 100 º C down to 0.1619.

Uses:
Can be used as polishing powder, paper fillers, as well as health care Desiccant gas on the plaster bandage, but also in areas such as agriculture and metallurgy. Also regulate cement plaster cement solidification of the time.

Use of gypsum in agriculture in order to reduce the alkaline soil. Gypsum mine in the coal with a high temperature system can be used in the production of sulfuric acid SO2. CaSO4 not solubility, and its solubility was increased after the first of the special situation of the lower. 10 º C, such as water solubility for 0.1928g/100g (with), 40º C for 0.2097, 100º C fell to 0.1619, allows the dissolved calcium sulfate in the high-pressure boiler of hard water (up to 400 º C) in scale, causing harm, should be Na2CO3 in advance so that the use of CaSO4 into more of the insoluble precipitate CaCO3 removed (so to soften hard water). In the case of thin marble H2SO4 due to micro-generation packet CaSO4 dissolved in acid and impede the marble surface of the contact, so that the reaction to stop, it does not dilute H2SO4 marble and making CO2.

Packaging: 50KG/BAG composite plastic woven bags lined polyethylene film bag.