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STMP Sodium Trimetaphosphate CAS 7785-84-4

Chemical Name: Sodium Trimetaphosphate

Synonymous Names: STMP; Trisodium Trimetaphosphate; Sodium Cyclotriphosphate; Trisodium Cyclotriphosphate

CAS No.: 7785-84-4

Molecular Formula: Na₃P₃O₉

Molecular Weight: 305.89 g/mol

Purity: ≥99%

EINECS No.: 232-088-3

Grade: Food Grade; Industrial Grade

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Description
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Foconsci’s Sodium Trimetaphosphate (STMP) is used in starch modification, phosphate-based cleaning products, and the production of crosslinked polysaccharide materials.

STMP reacts with starch and other polysaccharides to form phosphate crosslinks. In modified starch production, this helps improve stability during heating and processing. Sodium Trimetaphosphate is also used in industrial formulations that require phosphate-based water softening and dispersion.

Structural Formula:

Product Specification

Item	Specification
Product name	Sodium Trimetaphosphate
CAS number	7785-84-4
Appearance	White powder
Purity	99% Min
PH value ( 1% aqueous solution)	6.0-9.0
Heavy metal (calculated as Pb)%	0.001 Max
Arsenic (As)%	0.0003 Max
Fluoride ((based on CI)%	0.005 Max
Water insoluble matter%	0.1 Max

Applications of Sodium Trimetaphosphate (STMP)

Modified Starch Production: Sodium Trimetaphosphate is used to produce crosslinked starch for food and industrial applications. It forms phosphate links between starch molecules, helping the modified starch maintain viscosity and texture during heating and processing. STMP can also be used together with Sodium Tripolyphosphate (STPP)in starch modification.
Food Processing: Food-grade Sodium Trimetaphosphate is used as a starch-modifying agent in the production of modified starches for sauces, fillings, dairy products, and other processed foods.
Detergents and Industrial Cleaning: Sodium Trimetaphosphate is used in phosphate-based detergent and cleaning formulations. It helps bind hardness ions and supports the dispersion of dirt and suspended particles in cleaning solutions.
Polysaccharide Crosslinking:STMP is used to crosslink natural polymers such as starch, cellulose derivatives, and chitosan-based materials. It can help reduce water solubility and improve the strength and stability of the resulting polymer networks.
Functional Packaging Films: Sodium Trimetaphosphate can be used to prepare crosslinked chitosan and methylcellulose films.

Packaging & Storage

Packaging: 25 kg bags with moisture-resistant inner liners.

Store Sodium Trimetaphosphate in sealed packaging and protect it from moisture. Avoid exposure to water during storage.

Safety Information

Avoid breathing dust and contact with eyes during handling. Use suitable protective equipment and follow the product SDS. Keep the material away from moisture and incompatible substances.