1.With the advantages of smooth surface, even size, high hardness, wearable and stable. 2. ... as disperser, grinding me 1) Product Function With the advantages of smooth surface, even size, high hardness, wearable and stable, widely ... PT021), 695kg/mm2(grade ZQ021)D: Compressive strength:2150kg/cm2E: Coefficient of expansion:86×10°-7F: Bulk weight:1.5g/cm33)Size ...