What is sodium tripolyphosphate?

Sodium tripolyphosphate (STPP) is an inorganic compound with the chemical formula Na5P3O10. It is often used as a cleaning agent, preservative, and builder in detergent formulations. STPP is also used in the food industry as a food additive to preserve moisture and to improve the texture of frozen fish and seafood. It has the ability to bind with calcium and prevent it from being deposited as crystals, thereby preventing the formation of hard water deposits. STPP is soluble in water and forms a clear solution. It is classified as a moderately hazardous substance and requires proper handling and storage. Overexposure to STPP can cause irritation to the eyes, skin, throat, and respiratory system.