Sodium trimetaphosphate is an inorganic compound with the chemical formula Na₃(PO₃)₃. It is also known as sodium tripolyphosphate, and soluble in water. It is a multifunctional chemical raw material with a wide range of applications in industry and households.

Sodium trimetaphosphate is a versatile chemical that is widely used in industrial, household, and agricultural applications. Here are some of the main uses of sodium trimetaphosphate:

1. Water treatment: Sodium trimetaphosphate is an effective flocculant used to purify drinking water and industrial water. It can promote the aggregation of suspended particles into larger agglomerates, which are convenient for precipitation and filtration, thereby removing impurities from the water.

2. Detergents and detergents: In household and commercial cleaning products, sodium trimetaphosphate is used as a softener to help remove calcium and magnesium ions from hard water and improve cleaning results. It is also used as a detergent to help remove stains from clothing.

3. Industrial auxiliaries: Sodium trimetaphosphate is used in industry as an auxiliary, such as a dispersant and flocculant in the production of ceramics, glass and textiles. It can also be used as a corrosion inhibitor on metal surfaces to prevent metal corrosion.

4. Food industry: In the food industry, sodium trimetaphosphate is used as a preservative, stabilizer, and coagulant. It can help maintain the color and texture of food products and extend shelf life.

5. Agriculture: Sodium trimetaphosphate can be used as a fertilizer additive to help plants absorb trace elements in the soil and improve the effect of fertilizer.

6. Petroleum industry: In the process of oil extraction and refining, sodium trimetaphosphate is used as a corrosion inhibitor and scale inhibitor to reduce the corrosion and clogging of pipelines and equipment.

7. Medicine and biotechnology: Sodium trimetaphosphate has potential applications in the field of medicine and biotechnology, such as as as a buffer and stabilizer.