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Sodium pyrophosphate, also known as tetrasodium diphosphate or tetrasodium phosphate, can be divided into anhydrous and decahydrate substances. Decahydrate is colorless or white crystalline or crystalline powder, anhydrous is white powder, soluble in water, insoluble in ethanol and other organic solvents.

Main uses
The electroplating industry is used to prepare electroplating solutions, which can form complexes with iron. Wool spinning industry is used as a wool degreaser and bleaching agent. The papermaking industry is used for bleaching paper and plant fibers. The printing and dyeing industry is used as an auxiliary agent for printing, dyeing, and fine bleaching. The daily chemical industry is used as a toothpaste additive, which can form colloids with calcium hydrogen phosphate and have a stabilizing effect. It can also be used to synthesize detergents and produce products such as shampoo. In addition to its ability to soften water, sodium pyrophosphate can also dissolve insoluble salts of calcium and magnesium, such as dirt formed by insoluble calcium soap or other metal soaps mixed in clothing fibers. It can dissolve them again and improve their cleaning ability. In addition, sodium pyrophosphate has an anti flocculation effect, causing oil to emulsify, which is called gelatinous properties. It can also further reduce the surface tension and interfacial tension of the surfactant solution, serving as a washing aid. Used as a rust remover in mechanical processing. Used as a dispersant and emulsifier in chemical production. It can also be used as a water treatment agent as a water softener, oil drilling, and other aspects.

Usage in food
As a quality improver, emulsifier, buffer, chelating agent, etc. in the food industry. 1. As a food quality improver, pH regulator, metal ion chelating agent, emulsifying dispersant, adhesive, etc. in the food industry, it is mainly used in meat and aquatic processing to improve pH value and water holding capacity, maintain fresh and tender meat, stabilize natural pigments, and prevent fat spoilage; 2. Used to enhance the processing performance of noodles and improve the quality of noodles; 3. Used as a quality improver for canned goods, fruit juice beverages, and dairy products; 4. Used to avoid discoloration of fruits after processing; 5. In addition, it can also be used as cleaning liquid for eggs, emulsifier for cheese, and additive for soy sauce and soybean milk.