This standard establis es the test methods for the determination of technological and analytical humidity, water of crystallization (H2O), the content of substances insoluble in hydrochloric acid, oxides of the ammonia group (RyOy), silicon dioxide, calcium oxide, magnesium oxide, ferric oxide, aluminum oxide, sulfur trioxide, total sulfur, carbon dioxide, sodium chloride, manganese, copper, sodium oxide, potassium oxide, calcium sulfate stones, dihydrate (CaS04 . 2 H20) and anhydrous salium sulfate (CaSOj) in all types and products of gypsum.