Sodium metaphosphate

Description

Sodium metaphosphate · CAS 10361-03-2 · NaO3P. UNII 532IUT7IRV. Melting Point: 628 °C.

Identification

CAS Registry Number	10361-03-2
PubChem CID	16133893
Molecular formula	NaO3P
UNII (FDA)	532IUT7IRV

Computed Descriptors

Molecular Weight	101.962
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	3
Rotatable Bond Count	0
Exact Mass	101.94827514
Monoisotopic Mass	101.94827514
Topological Polar Surface Area	57.2
Heavy Atom Count	5
Formal Charge	0
Complexity	49.8

Physical & Chemical Properties

Melting Point	628 °C

Physical description & handling notes

• Large Crystals; Dry Powder
• White solid, practically insoluble in water; [Merck Index]
• White powder. Practically insol in water and in aq solns of pyrophosphates and hexametaphosphates. Sol in mineral acids. Does not form complexes with Fe(II), Fe(III), U(IV) salts. /Maddrell's salt (polymeric sodium metaphosphate)/
• Sol in water (pH adjusted to 8-8.6). Insol in organic solvents. Possess dispersing and deflocculating properties, coagulate albumins, and inhibit the crystallinization of slightly sol compds such as calcium carbonate and calcium sulfate. /Glassy sodium metaphosphate; Graham's salt/
• When heated to decomposition it emits toxic fumes of sodium oxide and phosphoxides.
• Clear, hygroscopic glass. MP: 628 °C. Sol in water, but dissolves slowly. Depolymerizes in aqueous soln to form sodium trimetaphosphate and sodium orthophosphates. /Glassy sodium metaphosphate; Graham's salt/

Regulatory Status

Regulatory & Food Contact	FDA Substance added to food: EMULSIFIER OR EMULSIFIER SALT, FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT, PH EMULSIFIER; SEQUESTRANT; TEXTURIZER; THICKENER: Food Additives EMULSIFIER OR EMULSIFIER SALT, FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT, PH CONTROL AGENT, SEQUESTRANT, ST GRAHAM'S SALT Group MTDI for phosphorus from all sources, expressed as P TRS 683-JECFA 26/25
GHS notification summary	90.5% (526 / 581)

GHS Hazard Classification

GHS notification summary	90.5% (526 / 581)
Reported hazard statements	H315 (100%), H319 (100%), H335 (97.6%)

Documented Uses

• CIR ingredient: Sodium Metaphosphate
• Used in toothpaste and dentifrices (abrasive), detergents, water softeners, food additives (sequestrant and emulsifier), and textile processing; [HSDB]
• Textiles (Fiber & Fabric Manufacturing) [Category: Industry]
• Used in toothpaste formulations as an abrasive.
• Dental polishing agents, detergent builders, water softeners, sequestrants, emulsifiers, food additives, textile processing, laundering. /Sodium metaphosphate/
• In dentifrices, polishing agents, abrasive detergents. /Maddrell's salt (polymeric sodim metaphosphate)/

Synonyms

Sodium metaphosphate; Kurrol's salt; Sporix; Maddrell's salt; Sodium Kurrol's salt; Insoluble metaphosphate; Sodium metaphosphate (NaPO3); 532IUT7IRV; SODIUM METAPHOSPHATE (NA(PO3)); DTXSID6040244; J139.264F; RefChem:1098817; DTXCID4020244; 233-782-9; 10361-03-2; Metaphosphoric acid, sodium salt

Frequently Asked Questions

What are the CAS number and molecular formula of Sodium metaphosphate?

CAS 10361-03-2; molecular formula NaO3P; molecular weight — g/mol.

What other names is Sodium metaphosphate known by?

Sodium metaphosphate, Kurrol's salt, Sporix, Maddrell's salt, Sodium Kurrol's salt, Insoluble metaphosphate.

What is the regulatory status of Sodium metaphosphate?

Documented regulatory listings: FDA Substance added to food: EMULSIFIER OR EMULSIFIER SALT, FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT, PH ; EMULSIFIER; SEQUESTRANT; TEXTURIZER; THICKENER: Food Additives; EMULSIFIER OR EMULSIFIER SALT, FLAVOR ENHANCER, FLAVORING AGENT OR ADJUVANT, PH CONTROL AGENT, SEQUESTRANT, ST.

Is Sodium metaphosphate classified as hazardous?

90.5% of GHS notifications report no hazard classification (526 of 581).

What are the key physical properties of Sodium metaphosphate?

Melting Point: 628 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.