sodium sulphate anhydrous 99% CAS:7757-82-6 Specifications PURITY 99% MIN WATER INSOLUBLE 0.05% MAX Ca&Mg 0.15% MAX CHLORIDE 0.35% MAX Fe 0.002% MAX MOISTURE 0.20% MAX WHITENESS 85% MIN also can order for the ssa of PH OF 1.0% SOLUTION 6-8SSA is used in the glass industry, dying, detergent and so on..