Sodium Trimetaphosphate (STMP)

Overview

Sodium trimetaphosphate (STMP) is a cyclic phosphate supplied as a white crystalline powder that dissolves in water. It is mainly used as a cross-linking agent for starch and in other industrial applications.

Also known as

STMP; Trisodium trimetaphosphate; Cyclic sodium metaphosphate

CAS number

7785-84-4

Molecular formula

Na3P3O9

Molecular weight

305.89

Specifications

Test items	Specifications
Appearance	White crystalline powder
STMP (as Na3P3O9) /%	≥95
P2O5 content /%	≥68
pH (1%)	6.0-9.0
Water insoluble matter /%	≤0.1
Density /(g/cm³)	2.49

Applications

• Cross-linking agent for modified starches
• Water treatment and dispersant
• Dispersant for ceramics and pigments
• Raw material for other phosphate products

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.