Tetrasodium Pyrophosphate (TSPP) is white powder, soluble in water, insoluble in alcohol, relative density 2.45, melting point 890 ℃, a weak alkalineaqueous solution, easy deliguescence in the air. Aqueous solution is stable under 70 '℃, boiling is hydrolyzed todisodium hydrogen phosphate.. Used in cans, juice drinks, dairy products, soy products, soy milk, etc. as quality improver.