barite powder , 325 mesh ,specific gravity4.1- 4.2 , use in drilling and rubber ... usually with the whiteness is abt 70% , and 325 mesh, specific gravity is 4.2 it can be widely ... White Powder Content of BaSO4≥90%Specific Gravity4.1-4.2 g/cm³SiO2≤2.5%Particle ... -75umAl2O3≤ 0.5 %Water Soluble≤ 0.1 %CaCO3≤ 2%Moisture≤ 1%PolymerizationNo PolymerizationApplicationUse as materials of oil-drilling mud ...