Natriummetaphosphat

Cosmetic ingredients (Sodium Metaphosphate) -> CIR (Cosmetic Ingredient Review)

Buffering; Chelating

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/

Large Crystals; Dry Powder

White solid, practically insoluble in water; [Merck Index]

This chemical does not meet GHS hazard criteria for 90.5% (526 of 581) of all reports.

Not Classified

Aggregated GHS information provided per 581 reports by companies from 8 notifications to the ECHA C&L Inventory.

Warning

H315 (100%): Causes skin irritation [Warning Skin corrosion/irritation]

P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501 (click each P-code to see the statement)

Chemical: Metaphosphoric acid (HPO3), sodium salt

Chemical: Metaphosphoric acid, sodium salt

Metaphosphoric acid (HPO3), sodium salt (1:1) is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Metaphosphoric acid (HPO3), sodium salt (1:1) are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)

Status: Active Update: 11-04-2023 https://echa.europa.eu/registration-dossier/-/registered-dossier/14376

Metaphosphoric acid (HPO3), sodium salt: Does not have an individual approval but may be used under an appropriate group standard

Metaphosphoric acid, sodium salt: Does not have an individual approval but may be used as a component in a product covered by a group standard. It is not approved for use as a chemical in its own right.

It changes to sodium trimetaphosphate above 505 deg C and to sodium hexametaphosphate above 607 deg C; [Merck Index] Intraperitoneal LD50 (mouse) = 830 mg/kg; Acute tubular necrosis is adverse effect in IP lethal dose studies; [ChemIDplus] See Sodium tetrametaphosphate.

Not Classified

Skin Irrit. 2 (100%)

Not Classified

SRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.

2.7 [mg/m3]

30 [mg/m3]

180 [mg/m3]

The CIR Expert Panel concluded that the following 31 ingredients are safe in the present practices of use and concentration in cosmetics as described in this safety assessment, when formulated to be non-irritating...Sodium Metaphosphate...

Safe for use in cosmetics, with qualifications

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)/

2023: 1,135,421 lb

(1977) 5.93X10+10 GRAMS

(1979) 6.71X10+10 GRAMS

Dehydration of sodium phosphates (e.g. Na2H2P2O7, NaH2PO4, Na2HPO4). Upon heating NaH2PO4 or NaNH4HPO4 to 250 °C and then slowly to 350 °C, first Na2H2P2O7 and then the insol Maddrell's salt is obtained, which is stable to about 500 °C; at 505 deg it changes to sodium trimetaphosphate, and above 607 °C to sodium hexametaphosphate. According to Maddrell, Ann. 61, 63 (1847) the salt may be prepd by heating two parts NaNO3 with one part H3PO4. An improved procedure is described by v. Knorre, Z. Anorg. Chem. 24, 397 (1900). /Maddrell's salt (polymeric sodium metaphosphate)/

Prepd by rapidly chilling molten sodium metaphosphate. /Glassy sodium metaphosphate; Graham's salt/

Food Additives -> EMULSIFIER; SEQUESTRANT; TEXTURIZER; THICKENER -> JECFA Functional Classes

Food Additives -> EMULSIFIER; SEQUESTRANT; TEXTURIZER; THICKENER -> JECFA Functional Classes

Food Additives -> EMULSIFIER; SEQUESTRANT; TEXTURIZER; THICKENER -> JECFA Functional Classes

Cosmetics -> Buffering; Chelating

Not Known or Reasonably Ascertainable

Metaphosphoric acid (HPO3), sodium salt (1:1): ACTIVE

SODIUM METAPHOSPHATE INHIBITED GROWTH OF E COLI.

(NaPO3)n where "n" may be 2 or more. Several different forms are known.

(NaPO3)n. The value of n ranges from 3 to 10 (cyclic molecules) or may be much larger number (polymer). The vitreous sodium phosphates having N2O/P2O5 mole ratios near unity are classified as sodium metaphosphates (Graham's salts). The average number of of phosphorus atoms per molecule in these glasses ranges from 25 to infinity.

The term sodium metaphosphate has also been extended to short-chain vitreous compositions, the molecules of which exhibit the polyphosphate formula Na(n+2)PnO(3n+1) with n as low as 4-5. These materials are more correctly called sodium pyrophosphates.