Features: 1) Material: natural minerals 2) Smooth and moistened and balanced granules 3) Large hardness 4) Good disintegrable rate 5) Specifications: a) Grain size: 1.0 - 2.0mm, 2.0 - 4.0mm b) Moisture content: less than 1.0% c) Hardness: more than 2.0kg/cm2 (2.0 - 4.0mm) d) Disintegrable rate: more than 90% e) C-MgO: more than 55.0% f) Appearance: white