... be controlled 3. SGS Oil Drilling Carboxymethyl CelluloseCMC in Oil IndustryPetroleum grade Product features:1, high degree of substitution, good ... of substitution .2, high transparency, viscosity and water loss can be controlled .3, suitable for fresh water, sea water ... .5, can improve mud-making volum, reduce filteration loss .6, has excellent performance in drilling of oil .Petroleum grade Product ...