Barite Powder Oil Drilling BaSO4: 90%Min Whiteness:80% Size:200Mesh,325Mesh Packing:25KG/ ... to make a thixotropic mud for sealing oil wells during drilling. Prime white, a bleached barite, is used as a pigment ... mixture of barium sulfate, zinc sulfide, and zinc oxide. 1. Drilling Grade BaSO4: 92% Min. Hg: 1 PPM Max. CD: 3 ...