Features: 1) Combined magnesia with solubility in acid and solubility in water 2) Large hardness 3) Combination proportion adjustable 4) Specifications: a) Grain size: 2.5 - 4.0mm b) Moisture content: less than 1.5% (1) or 2.0% (2) c) Hardness: more than 2.0kg/cm2 (1) or 1.5kg/cm2 (2) d) Disintegrable rate: more than 90% e) C-MgO: more than 53.0% (1) or 35.0% (2) f) W-MgO: more than 3.0% (1) or 15.0% (2) g)Appearance: white