... 1, high degree of substitution, good uniformity of substitution,Mainly used in oil drillingdrilling fluids CMC : 1, high degree of substitution, good uniformity of substitution . 2 ... mud-making volum, reduce filteration loss . 6, has excellent performance in drilling of oil . Petroleum grade Product: PAC-LV, PAC-R, CMC-LV ... ≤16≤13≤12≤11 ≤26≤18Test StandardAPI 13 I oil drilling fluids garde CMC