Used as filler of detergent, the making of sodium sulphide, water glass, or used in papermaking, glass, dye and used as filler. Molecular formula: Na2SO4 Molecular weight: 142. 04 Property: white granular crystal or powder , Na2SO4. 7H2O) is white rhombic crystal . Uses: used as filler of detergent, the making of sodium sulphide, water glass, or used in papermaking, glass, dye and used as filler, Dyeing auxiliary, laxative, antidote, t also can be used in fiber, lether, metallurgy, enamel and soap. Packing: 25kg or 50kgplastic woven bag, lined with plastic bag.