the manufacturing of precipitated micronized grade of Barium sulphate B.P.U.S.P. only the micronized grade of “Barium Sulphate’ can comply with the parameter of bulkiness sedimentation prescribed in B.P. U.S.P. It is a well known fact that coarse particles of Barium Sulphate gives the best x-ray results. Hence, U.S.P.26 & B.P.2010 has deleted the test for bulkiness sedimentation. Hence, most of the microbar products are manufactured by using coarse particles of Barium Sulphate