Grade : Technical Grade Formula : MgSO4.7H2O HS Code :28332100 Appearance :White crystals CAS NO : 10034-99-8 with the formula Assay % 98.00min ,Magnesium (as Mg) 9.60 min..pH(of1%aq.Soln) 6.5â??8.5,, Heavy metals (as Pb and As) %NIL ,,Iron Content (as Fe) PPM 70 max ,,Water Insoluble matter % 0.05 max