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State GB/T6009-2003 One sort one class Sodium sulphate(%) í¦99.0 Water-indissoluble matter(%) í_0.05 Fe(%) í_0.002 Calcium Magnesium ( mg)(%) í_0.15 Chloride(CL) (%) í_0.35 Water(%) í_0.20 Whiteness(%) í¦82 PH 9 OR 6-8 25 or 50 kg PP/PE bags.