Calcium Sulfate, Hemihydrate (Alpha)

Calcium Sulfate Hemihydrate (Alpha) also known as plaster of Paris is used to produce high strength plasters. Its fine particle size and quick setting ability mean it is ideal for use in creating smooth surfaces and ornamental designs on ceilings, walls and floors as well as used to produce molds for roof tiles and ceramics or as an accelerator in oil and gas well cementing..

Alpha plaster or Type II plaster is a type of calcium sulphate hemihydrates with a different crystalline structure compared to beta plaster. It has the chemical formula CaSO₄·1/2H₂O. It is obtained by calcining the naturally occurring gypsum. 

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