Used in oil and gas drilling, well digging and other projects ① Mud containing CMC can form a thin and strong filter cake with low permeability on the well wall, reducing water loss. ② After adding CMC to the mud, the drilling rig can obtain a low initial shear force, making it easy for the mud to release the gas wrapped in it, and quickly abandon the debris in the mud pit. ③ Drilling mud, like other suspended dispersions, has a certain existence period. Adding CMC can make it stable and extend its existence period. ④ Mud containing CMC is rarely affected by mold, so it is not necessary to maintain a high pH value or use preservatives. ⑤ CMC is used as a drilling mud washing fluid treatment agent to resist pollution from various soluble salts. ⑥ Mud containing CMC has good stability and can reduce water loss even at a temperature above 150°C. CMC with high viscosity and high substitution degree is suitable for mud with low density, while CMC with low viscosity and high substitution degree is suitable for mud with high density. The selection of CMC should be determined according to different conditions such as mud type, region, and well depth. 2. Used in textile and printing and dyeing industries. The textile industry uses CMC as a sizing agent for sizing light yarns of strong materials such as cotton, silk, wool, chemical fibers, and blended fabrics; 3. Used in the papermaking industry. CMC can be used as a paper surface smoothing agent and sizing agent in the papermaking industry. Adding 0.1% to 0.3% CMC to the pulp can increase the tension resistance of the paper by 40% to 50%, increase the compression bursting degree by 50%, and increase the kneading property by 4 to 5 times. 4. CMC can be added to synthetic detergents as a dirt adsorbent; daily chemicals such as toothpaste industry CMC glycerol aqueous solution is used as the gum base of toothpaste; pharmaceutical industry is used as a thickener and emulsifier; CMC aqueous solution is used for flotation beneficiation after viscosity increase. 5. Used in the ceramic industry to make adhesives, plasticizers, glaze suspending agents, color fixatives, etc. for blanks. 6. Used in construction to improve water retention and strength. 7. Used in the food industry. The food industry uses high-replacement CMC as a thickener for ice cream, canned food, instant noodles, and a foam stabilizer for beer. It is also used as a thickener, binder, or shaper in the processing of jams, syrups, fruit dew, desserts, ice cream drinks, etc. 8. The pharmaceutical industry uses CMC with appropriate viscosity as a binder, disintegrant, and suspending agent for suspensions.