Sodium Tripolyphosphate

short description:

CAS：7758-29-4

Sodium tripolyphosphate also known as pentasodium phosphate, sodium pyrometaphosphate, STPP, pentasodium tripolyphosphate. White powdery crystal with good fluidity, relative molecular weight of 367.Chemicalbook86, melting point of 622 ℃, easily soluble in water, and its aqueous solution is alkaline. Commonly used in food as a water retention agent, quality improvement agent, pH regulator, and metal chelating agent.

Sodium tripolyphosphate aqueous solution is weakly alkaline (the pH value of a 1% aqueous solution is about 9.7), and it forms a suspension (similar to an emulsion) in water with a pH range of 4.3-14, which is called dispersion. Sodium tripolyphosphate can also improve the solubility of liquid and solid chemical particles in liquid (such as water) media, making the solution completely transparent and resembling a real solution. This is known as solubilization. Due to its unique properties, sodium tripolyphosphate has become an important and ideal raw material in laundry detergent.

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Specification

Compound	Specification	Result
Sodium tripolyphosphate (Na₅P₃O₁₀) content: %≥	94.0	94.55
Phosphorus pentoxide (P2O5) content: % ≥	56.5	57.12
Water insoluble content: % ≤	0.10	0.012
PH value (1% solution):	9.2-10.0	9.5
Iron as Fe: %	0.015	0.003
Whiteness：	85	90
Density of performance:	0.35-0.9	0.81