the following is the product's characteristics: specific gravity:1.57 more than 1.8g/cm3 subsistance lower or equal to 3% S content:0.05% volume weight:0.947t/m3 HCL'S solubility:0.98% Pb content:0.045% wear percentage:lower or equal to 0.68% poriness:51.99% content of Cu:0.025% wear rate:less or equal to 0.32% equality ratio: K60 less or equal to 2.0 content of Zn 0.04% ashness:less or equal to 1.0% asymetrical ratio:K80less or equal to 1.5 burnt value:6800Kee/kg density: 1.57g/cm3 soil content:less or equal to 0.52 other heavy mental's content:not exceed to national drinking water standard solid content:less or equal to 1% C's content:less or equal to 90