Calcium Sulphate Dihydrate is colorless columnar crystal or white crystalloid powder. 128 °C lose 1.5 gesso to half hydrate and 163 °C above be without water content. The relative density 2.32, melting point °C (1450 without water content). Slightly soluble in hot water soluble in alcohols and most organic solvents.
ITEM
STANDARD
Assay(on the dried base)
min. 98.0%
Loss on drying
19.0 %-23%
Flouride
max.0.003%
Arsenic (As)
max. 2 mg/kg
Lead (Pb
max. 2 mg/kg
Selenium
max. 0.003%
Heavy metals
max. 10