Sodium carboxymethyl cellulose (CMC-Na) is an organic compound with the chemical formula [C6H7O2(OH)2OCH2COONA]n, a carboxymethylated cellulose derivative and the main ionic cellulose rubber.

The molecular formula of potassium sorbate is C6H7O2K, white to light yellow scaly crystals, crystal particles or crystal powder, odorless or slightly odorless, easily absorb moisture, oxidize and decompose, and discolour when exposed to air for extended periods of time.

Sodium carboxymethyl cellulose is usually an anionic polymer compound obtained by reacting natural cellulose with caustic alkali and monochloroacetic acid, with a molecular weight ranging from several thousand to one million. CMC-Na is white fibrous or granular powder, odorless, tasteless, hygroscopic, easy to disperse in water to form a transparent colloidal solution.

Potassium sorbate​ is often used as a preservative. It destroys many enzyme systems by binding to the sulfhydryl group of the microbial enzyme system. Its toxicity is much lower than other preservatives and it is currently widely used. Potassium sorbate can fully exploit its antiseptic effect in an acidic environment, but has a low antiseptic effect under neutral conditions.