... making, tanning, metal smelting, surface treatment and filler industries. Grade: Class I first quality Packing: 50kg/piece, 25kg/piece, in ... dyeing, synthetic fiber, leather industry as well.Sodium sulfate Specifications Anhydrous sodium sulfate.GB/T9853-2008No .Test ItemsUnit ARResultsLevel 1Na2SO4 Content% ... -10Pb% max0.00050.0005-11N% max0.00050.0005- Sodium Sulfate anhydrous 99.6% MIN Na2SO4