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Sodium Tripolyphosphate

Sodium Tripolyphosphate

Basic Information

CAS No.: 7758-29-4
Molecular Formula: Na₅P₃O₁₀
Molecular Weight: 367.86

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Product Details

Sodium Tripolyphosphate is a white crystalline powder with strong dispersing, sequestering and buffering properties. It is widely used in detergent formulations, water treatment, food processing, ceramic manufacturing and textile processing.


Chemical Properties

PropertyValue
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 Information

PropertyValue
Hazard Codes

Xi

Risk Statements

36/37/38

Safety Statements

26-36-24/25

WGK Germany

1

RTECS

YK4570000

F

3

TSCA

Yes

HS Code

28353110

Hazardous Substances Data

7758-29-4(Hazardous Substances Data)

Toxicity

LD50 orally in rats: 6.50 g/kg (Smyth)


Product Usage

Sodium tripolyphosphate (STPP) is an important inorganic chemical auxiliary. In the detergent industry, it is a highly effective water softener and builder, chelating calcium and magnesium ions in water to prevent soap scum deposition, thereby significantly improving the detergency of laundry powders and dishwashing liquids. In the food industry, it is used as a moisture retention agent and quality improver, widely applied in meat, seafood, and dairy processing to enhance water-holding capacity, improve texture, and prevent fat oxidation. Additionally, it is used in the ceramic industry for slurry deflocculation, and in textile and paper industries as a dispersant and anti-settling agent. Its advantages include strong chelating ability and good synergies, but it should be noted that phosphorus-containing wastewater may contribute to eutrophication of water bodies.

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