Sodium carboxymethyl cellulose (CMC) (medium viscosity) is a fine chemical product from the brand RESEARCH-LAB FINE CHEM INDUSTRIES. It is also known as Carboxymethylcellulose sodium salt. CAS Number: 9004-32-4Quantity: 100 gm/BottleCMC is also used as a thickening agent, for example, in the oil-drilling industry as an ingredient of drilling mud, where it acts as a viscosity modifier and water retention agent. Aqueous solutions of CMC have also been used to disperse carbon nanotubes.