Sodium trimetaphosphate

CAS Number
7785-84-4
EC Number
232-088-3
Abbreviation
STMP

What is Sodium trimetaphosphate?

Sodium trimetaphosphate (CAS 7785-84-4), commonly abbreviated as STMP, is an inorganic cyclic phosphate salt.

Where is Sodium trimetaphosphate used?

  • Food processing: crosslinks starch granules to improve heat and shear stability in canned goods, sauces, and instant food products
  • Water treatment: sequesters calcium and magnesium ions, preventing scale formation in distribution systems and industrial cooling circuits
  • Textile and paper manufacturing: dispersing and sequestering agent during processing baths
  • Leather processing: buffering and chelating agent to regulate pH during tanning stages
  • It also functions as a crosslinking agent, chelating agent, and buffering compound.

Other Names (Synonyms)

Trisodium trimetaphosphate|Trisodium metaphosphate|Cyclic sodium trimetaphosphate|Sodium phosphate ((NaPO3)3)|Metaphosphoric acid, trisodium salt|Sodium metaphosphate (Na3(P3O9))|Trisodium trimetaphosphate (Na3P3O9)|Cyclisches trinatriummetaphosphat|STMP

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What are the physical properties of Sodium trimetaphosphate?

Melting Point 53°C [MER06]
Density 2.49 g/cm³
Color White
Form Powder
Water Solubility Soluble in water. Insoluble in alcohol.

Which trade and regulatory codes apply to Sodium trimetaphosphate?

HS Code 28353190
UN Number 3077
ADR Class 9
Packing Group III
Storage Class 11 - Combustible Solids
WGK (Germany) 2
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