WHAT IS SODIUM TRIPOLYPHOSPHATE
Sodium tripolyphosphate (STPP) with formula Na5P3O10, is the sodium salt of triphosphoric acid. It is a water soluble, white, odourless powder or granular material. STPP is most commonly used as a builder in detergent and cleaning formulations as it enhances their cleaning power. It also acts as a water softener. It acts as a Sequestrant for alkaline metals, scale control, corrosion control, and water softening.
- CAS No: 7758–29–4
- EINECS No: 231–838–7
- Other Names: Sodium tripolyphosphate; STPP; STP; sodium triphosphate; TPP; Pentasodium triphosphate;
- Appearance: White powder
- Formula: Na5P3O10
- Density: 2.52 g/cm3
- Molar Mass: 367.86 g mol/1
- Melting point: 622 oC
- Solubility: soluble in water 145 g/L @25C
- pH: 9.5 – 10.3 (10% solution)
Uses for sodium tripolyphosphate
It is used in various applications including in toothpaste and as a builder in soaps and detergents, improving their cleansing ability.
STPP is a solid inorganic compound used in a large variety of household cleaning products, mainly as a builder, but also in industrial cleaning processes and ceramics manufacture. STPP is widely used in regular and compact laundry detergents and automatic dishwashing detergents (in powder, liquid, gel and/or tablet form), toilet cleaners, surface cleaners, and coffee urn cleaners. It also provides a number of chemical functions including: sequestration of “water hardness”, enabling surfactants to function effectively; pH buffering; dirt emulsification and prevention of deposition; hydrolysis of grease; and dissolving-dispersing dirt particles
Health & Safety
R-phrase(s): R36/37/38 Irritating to eyes, respiratory system and skin.
S-phrase(s): S26 In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 Wear suitable protective clothing
For more information see MSDS for sodium tripolyphosphate