Molecular formula: mgso4.7h2o. Characteristics: --white and thin granule powder or crystal. --purity91%min -- usp grade, agriculture and tech grade Application: Magnesium sulfate is used in fertilizer, feed additive, and industry and agriculture application and food. Uses : Weight additive for cotton, silk, filling for kapok products, evacuant for porcelain, fuels and fireproof materials, additive for brewing. Also used in rayon and textile industry. It belongs to feedstuffs grade. We are manufacturer of magnesium sulphate hepta, and cerntainly we have best price with good quality. Technological index: Item Index Magnesium(mg)(to element meter),8.0% Boron(b)(to element meter),0.4% Iron(fe)(to element meter),0.4% Sulfur(s)(to element meter),6.0% Water insoluble matter0.15% Moisture(h2o)6.0% Ph value(solid 1+250aqueous solution)5.0-8.0 harmful element Arsenic(as)(to element meter)0.002% Plumbum(pb)(to element meter)0.002% Cadmium(cd)(to element meter)0.01% Chromium(cr)(to element meter)0.03% Mercury(hg)(to element meter)0.005% 25kg woven bags or according to customs request