| http://www.w3.org/ns/prov#value | - Fibrous ??-calcium sulfate hemihydrate as a raw material is usually obtained as a suspension by any of well known methods, for example, heat-treating of calcium sulfate dihydrate in water or the mixture between water and water-soluble organic solvents such as alcohols, ketones and the like; and heat-treating of calcium sulfite in acidic solvent.
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