... absorb moisture; odorless, non-toxic. Use: widely used in vinylon, sodium silicate, bleaching, glass, paper making, tanning, metal smelting, surface ... dyeing, synthetic fiber, leather industry as well.Sodium sulfate Specifications Anhydrous sodium sulfate.GB/T9853-2008No .Test ItemsUnit ARResultsLevel 1Na2SO4 ... % max0.00050.0005-11N% max0.00050.0005- Hot sell!!!!!! Anhydrous Sodium Sulfate 99.6% min