Assay The content of MgO :6.8% ~8.3%
(calculated with the dried substance)
Chloride ≤0.15%
Sulfate ≤0.6%
Loss on Drying ≤4.0 %
Heavy metals ≤15mg/kg
Arsenic ≤3mg/kg
Lead ≤10mg/kg
325 mesh ≥ 99.0%