... good uniformity of substitution,Mainly used in oil drillingdrilling fluids CMC : 1, high degree of substitution, good ... 6, has excellent performance in drilling of oil . Petroleum grade Product: PAC-LV, PAC-R, CMC-LV, CMC-HV ... min.30 min.10 max.TYPES AND SPECIFICATION PAC PropertyType Test ProcedureViscosity600rpm, Fann 35 in seawater/KClFiltrate ... 26≤18Test StandardAPI 13 I oil drilling fluids garde CMC