... ether featured the properties of high purity, high DS. PAC (polyanionic cellulose) is a kind of nonionic cellulose ether ... additive, thickening agent, filtrate reducer. PAC is an indispensable product for drilling mud making. PAC is high purity product; the water ... , bond, stabilizer, colloid protector, suspending agent, and filtrate reducer. PAC is a good drilling mud additive and also an important ...