... 1, high degree of substitution, good uniformity of substitution PETROLEUM GRADE CMCfeatures: 1, high degree of substitution, good uniformity of substitution ... . 6, has excellent performance in drilling of oil . Petroleum grade Product: PAC-LV, PAC-R, CMC-LV, CMC-HV TYPES ... -L4PAC-R1PAC-R2PAC-R3≥0.90PH6.5-9.0Purity % 65.0≥75.0≥95.0≥98.0≥75.0≥95 ... ≤13≤12≤11 ≤26≤18Test StandardAPI 13 I PETROLEUM GRADE CMC