INDEX RESULT APPEARANCE white grains MAGNESIUM SULPHATA % ≥ 99.0MIN Magnesium oxide % ≤ 16.24 Mg % ≤ 0.4 PH(5W/V%Sol) 4-6.5 Ferron(Fe) % ≤ 0.002 Chloride(CL) % ≤ 0.007 Heavy metal (Pb) % ≤ 0.001 Insolubility% ≤ 0.01 Grain diameter 0.1-1mm