Sodium Tripolyphosphate (STPP)

Overview

Sodium tripolyphosphate (STPP) is a white crystalline powder that dissolves in water. It is a strong complexing agent for calcium and magnesium ions and a widely used builder in detergents.

Also known as

STPP; Pentasodium triphosphate; Sodium triphosphate

CAS number

7758-29-4

Molecular formula

Na5P3O10

Molecular weight

367.86

Specifications

Test items	Specifications
Appearance	White crystalline powder
STPP (as Na5P3O10) /%	≥96
P2O5 content /%	≥57
Fe /%	≤0.007
pH (1%)	9.2-10.0
Water insoluble matter /%	≤0.1

Applications

• Builder in synthetic detergents and cleaning products
• Dispersant in ceramics, paints and pigments
• Water softening and industrial water treatment
• Tanning, textile and paper processing

Packaging

25 kg/bag (PE-lined); 1000 kg/jumbo bag.

Storage

Store in a dry, ventilated warehouse with the bags kept sealed, as the product absorbs moisture from the air.