Product Name: Magnesium Sulphate Heptahydrate "Origin: China CAS No.: 10034-99-8 AUCO No.: 476 Packing: 25kg bag" Item Specification Appearance White Crystals Purity 99% Loss on ignition 40%-52% PH 5-9.2 Chlorid (Cl) 0.014% Arsenic (As) 0.002% Iron (Fe) 0.002% Heavymetalaslead(Pb) 0.001% Selenium(Se) 0.003%