Product Description
Sodium Tripolyphosphate (STPP), CAS No. 7758-29-4, is an inorganic sodium phosphate compound with the chemical formula Na₅P₃O₁₀. It is commonly supplied as a white powder or granular solid and is widely used in industrial and commercial formulations. Due to its excellent water-softening, sequestering, and dispersing properties, STPP plays an important role in many chemical processing applications.
Sodium Tripolyphosphate is commonly used in detergent manufacturing, water treatment, ceramics, and selected food-processing applications where permitted by local regulations and the relevant product grade. It can help control metal ions, improve cleaning efficiency, and support the dispersion of solid particles. Its performance depends on product purity, particle size, grade, and formulation conditions.
Sodium tripolyphosphate Chemical Properties
Melting point | 622 °C |
density | 2.52 g/cm3 (20℃) |
vapor pressure | <0.1 hPa (20 °C) |
storage temp. | Storage temperature: no restrictions. |
solubility | H2O: may be clear to slightly hazy |
form | Powder/Solid |
color | White |
Odor | Odorless |
PH Range | 9.5 - 10.3 at 1 g/l at 20 °C |
PH | 9.0-10.0 (25℃, 1% in H2O) |
Water Solubility | 20 g/100 mL (20 ºC) |
Sensitive | Hygroscopic |
Merck | 14,8697 |
Stability: | Stable. Incompatible with strong oxidizing agents, strong acids. Hygroscopic. |
InChIKey | HWGNBUXHKFFFIH-UHFFFAOYSA-I |
LogP | -4.691 (est) |
CAS DataBase Reference | 7758-29-4(CAS DataBase Reference) |
EPA Substance Registry System | Sodium tripolyphosphate (7758-29-4) |
Safety and Storage
Handle according to the product-specific Safety Data Sheet (SDS).
Avoid inhalation of dust and unnecessary contact with eyes.
Wear suitable gloves, eye protection, and other recommended personal protective equipment.
Store in a tightly sealed container in a cool, dry, and well-ventilated area.
Protect from moisture to prevent caking and changes in product handling properties.
Food-grade and industrial-grade products should be stored and handled separately.
