Our factory is a professional manufacturer of Magnesium Carbonate Light. This is the quality index of our Mangesium Carbonate: MgO %≥ 41-45 CaO %≤ 0.43 Moisture %≤ 2 Insoluble in Hcl solution %≤ 0.1 Fe%≤ 0.02 Chloride (Cl) %≥ 0.1 As%≤ - Screening residues(through 150um mesh) %≤ 0.025 Sulphate %≤ 0.1 Losses in ignition %≤ 54-58 Soluble Chloride% ≤ - Heavy metal ≤ - Natrium % - Kalium % - Surface density(g/ml) %≤ 0.12