MgO(Mgo)% ≥ 92.0 calcium oxide (Cao)% ≤ 2.0 iron (Fe)% ≤ 0.10 hydrochloric acid insoluble material%≤ screen residue (150um)% ≤ 0.20 calcination lost volume% ≤ 5.5 sulfate% ≤ / laced% ≤ 0.15 Manganese ≤ - packing density (0.05) ≤ 0.25