305Dental MaterialsMedium
The product, which is obtained by calcining gypsum under steam pressure at 120-130°C or by dehydrating gypsum in the presence of sodium succinate is________?
AOrthorhombic anhydrate
BBeta – hemihydrates
CCalcium sulphate dihydrate
DAlpha – hemihydrates
Correct answer
D. Alpha – hemihydrates
Explanation
The correct answer is Alpha – hemihydrates.