... features: 1, high degree of substitution, good uniformity of substitution PETROLEUM GRADE CMCfeatures: 1, high degree of substitution, good uniformity of substitution . 2, high transparency ... , reduce filteration loss . 6, has excellent performance in drilling of oil . Petroleum grade Product: PAC-LV, PAC-R, CMC-LV, CMC-HV ... , ml16≤13≤12≤11 ≤26≤18Test StandardAPI 13 I PETROLEUM GRADE CMC