Sodium Sulfate 99% (Na2SO4) Purity: 99.6% min Manufacturer /factory high quality exceed ... Use: widely used in vinylon, sodium silicate, bleaching, glass, paper making, tanning, metal smelting, surface treatment and ... can be used in paper, glass, printing and dyeing, synthetic fiber, leather industry as well.Sodium sulfate Specifications ... % max0.00050.0005- Sodium Sulfate anhydrous 99.6% MIN Na2SO4