The Sodium Sulphate Anhydrous min 99%, White content purity min 88%, Industrial Grade, PH value:6-8 About us : Qingdao Central ... 99.0 MIN.water insolubles , %:0.05 MAX.Ca + Mg (as Mg), %:0.05 MAX.chlorides(Cl) , %:0.1 MAX.iron(Fe) , %:0.002 MAX.moisture , %:0 ... content (in Mg), %<0.100.25chloride content (in CL), %<0.250.60iron(Fe) content, %<0.00150.008moisture, %<0.100.30whiteness, % min8680 ...