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Home> Encyclopedia >   /  Food Additives  /  Phosphate  /  Other Inorganic Chemicals  /  Others  /  Other Inorganic Salts
sodium hexametaphosphate structure
sodium hexametaphosphate structure

sodium hexametaphosphate

CAS No.:10124-56-8
Molecular Weight:611.770386
Introduction: It can be used as a food quality improver in food industry, pH adjusting agent, metal ion chelating agents, dispersants, extenders, etc. It can be used as a kind of common analytical reagents, water softener, and also used for photofinishing and printing.It can be used as a water softener, detergent, preservative, cement hardening accelerator, fiber dyeing and cleaning agents; it can also used for medicine, food, petroleum, printing and dyeing, tanning, and paper industry.It can be used as texturizing agent; emulsifiers; stabilizer; chelating agent. It is less frequently for being used alone and is generally used in mixture with pyrophosphate and metaphosphate. The mixture is mainly used for ham, sausage, surimi such as the tissue improver for water retention, tendering and meat softening. It can also be used for prevention of crystallization of canned crab as well as dissolving agent of pectin.It can be used as the water softening agent of boiler water and industrial water (including water for the production of dyes, water for the production of titanium dioxide, water for printing and dyeing, and slurry mixing, water for cleaning color copy of the film, as well as chemical industrial water and the water for the medicines, reagents production, etc.) as well as the water treatment agent for the industrial cooling water; it can also be used as a corrosion inhibitor, flotation agent, dispersant agent, high temperature binding agent, dyeing auxiliaries, metal surface treatment, rust inhibitors, detergent additives and also cement hardening accelerator. Coated paper production can use it as pulp dispersants in order to improve the penetration capability. In addition, it can also be apply to the washing utensils and chemical fiber in order to remove iron ions of the pulp. In the oil industry, it can be used for the antirust of the drilling pipe and adjusting the slurry viscosity upon the control of oil drilling.It can be used as the quality improver with various effects of increasing the complex metal ions of food, pH, ionic strength, thereby improving the adhesive capability as well as the water holding ability of food. China provides that it can be applied to the dairy products, poultry products, ice cream, instant noodles and meat with the maximum permitted amount being 5.0 g/kg; the maximal permitted usage amount in canned food, fruit juice (flavored) drinks and vegetable protein drink is 1.0g/kg.It can be used as a food quality improver in food industry and applied to canned food, fruit juice drinks, dairy products, and soy milk. It can be used as Ph adjusting agent, metal ion chelate agent, adhesive and bulking agents. When being applied to beans and canned fruits and vegetables, it can be stabilize the natural pigment and protect the food color and lustre; when being used in canned meat, it can be used for preventing the emulsification of the fat and maintaining its uniform texture; when being applied to meat, it can be used to increase the water holding capacity and prevent the deterioration of fat in the meat. It can also help to clarify the wine when being supplied to beer and further prevent turbidity.
1. Names and Identifiers
1.1 Name
sodium hexametaphosphate
1.2 Synonyms

Calgon (old) Calgon S Chemi-charl Food Grade Sodium Hexametaphosphate Graham's salt Hexametaphosphate, sodium salt Hexasodium hexametaphosphate Hexasodium metaphosphate HMP Medi-Calgon Metaphosphoric acid (H6P6O18), hexasodium salt Metaphosphoric acid, hexasodium salt Natrium hexametaphosphat Natrium hexametaphosphat [German] Phosphate, sodium hexameta SHMP Sodium hexametaphosphate (Na6P6O18) Sodium Hexametaphosphate(Sodium Polyphosphates, Glassy Sodium metaphosphate Sodium phosphate (Na6P6O18) Sodium polymeta phosphate SODIUM POLYMETAPHOSPHATE SODIUM POLYPHOSPHATES SODIUM POLYPHOSPHATES GLASSY

1.3 CAS No.
10124-56-8
1.4 EINECS(EC#)
233-343-1
1.5 Molecular Formula
Na6O18P6 (isomer)
1.6 Inchi
InChI=1/6Na.H6O18P6/c;;;;;;1-19(2)13-20(3,4)15-22(7,8)17-24(11,12)18-23(9,10)16-21(5,6)14-19/h;;;;;;(H,1,2)(H,3,4)(H,5,6)(H,7,8)(H,9,10)(H,11,12)/q6*+1;/p-6
1.8 Canonical Smiles
[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].O=P1([O-])OP([O-])(=O)OP([O-])(=O)OP([O-])(=O)OP([O-])(=O)OP([O-])(=O)O1
2. Properties
3.1 Density
2.181
3.2 Melting Point
616 °C
3.3 Boiling Point
1500℃
3.4 Refractive Index
1.482
3.5 Appearance
white granular solid
3.6 Chemical Properties
It is colorless and transparent glass flake or white granular crystals. It is easily soluble in water but insoluble in organic solvents.
3.7 Color/Form
White
3.8 Stability
Stable. Keep dry.
3.9 StorageTemp
Store in a cool, dry place. Store in a tightly closed container.
3.10 Water Solubility
Soluble in water. Insoluble in organic solvents
3. Use and Manufacturing
4.1 Agricultural Uses
Sodium metaphosphate is the salt of metaphosphoric acidhaving a molecular formula (NaPO3)n, where n rangesfrom 3 to 10 (for cyclic molecules) or may be much larger(for polymers). Cyclic molecules have alternate phosphorus andoxygen atoms in the rings and start with trimetaphosphate(NaPO3)3 to at least decametaphosphate. Sodium hexametaphosphate may be a polymer where n isbetween 10 and 20. Vitreous sodium phosphates have a Na2O:P2O5 rationear unity and are called Graham's salts. The averagenumber of phosphorus atoms in these vitreous glassesranges from 25 to infinity.
4.2 Safety Profile
Poison by intravenous route. Moderately toxic by intraperitoneal and subcutaneous routes. Wdly toxic by ingestion. When heated to decomposition it emits toxic fumes of PO, and Na2O. See also PHOSPHATES. sodium hexametaphosphate Preparation Products And Raw materials Preparation Products
4.3 Storage
Ambient temperatures.
4.4 Usage
It can be used as a food quality improver in food industry, pH adjusting agent, metal ion chelating agents, dispersants, extenders, etc. It can be used as a kind of common analytical reagents, water softener, and also used for photofinishing and printing.It can be used as a water softener, detergent, preservative, cement hardening accelerator, fiber dyeing and cleaning agents; it can also used for medicine, food, petroleum, printing and dyeing, tanning, and paper industry.It can be used as texturizing agent; emulsifiers; stabilizer; chelating agent. It is less frequently for being used alone and is generally used in mixture with pyrophosphate and metaphosphate. The mixture is mainly used for ham, sausage, surimi such as the tissue improver for water retention, tendering and meat softening. It can also be used for prevention of crystallization of canned crab as well as dissolving agent of pectin.It can be used as the water softening agent of boiler water and industrial water (including water for the production of dyes, water for the production of titanium dioxide, water for printing and dyeing, and slurry mixing, water for cleaning color copy of the film, as well as chemical industrial water and the water for the medicines, reagents production, etc.) as well as the water treatment agent for the industrial cooling water; it can also be used as a corrosion inhibitor, flotation agent, dispersant agent, high temperature binding agent, dyeing auxiliaries, metal surface treatment, rust inhibitors, detergent additives and also cement hardening accelerator. Coated paper production can use it as pulp dispersants in order to improve the penetration capability. In addition, it can also be apply to the washing utensils and chemical fiber in order to remove iron ions of the pulp. In the oil industry, it can be used for the antirust of the drilling pipe and adjusting the slurry viscosity upon the control of oil drilling.It can be used as the quality improver with various effects of increasing the complex metal ions of food, pH, ionic strength, thereby improving the adhesive capability as well as the water holding ability of food. China provides that it can be applied to the dairy products, poultry products, ice cream, instant noodles and meat with the maximum permitted amount being 5.0 g/kg; the maximal permitted usage amount in canned food, fruit juice (flavored) drinks and vegetable protein drink is 1.0g/kg.It can be used as a food quality improver in food industry and applied to canned food, fruit juice drinks, dairy products, and soy milk. It can be used as Ph adjusting agent, metal ion chelate agent, adhesive and bulking agents. When being applied to beans and canned fruits and vegetables, it can be stabilize the natural pigment and protect the food color and lustre; when being used in canned meat, it can be used for preventing the emulsification of the fat and maintaining its uniform texture; when being applied to meat, it can be used to increase the water holding capacity and prevent the deterioration of fat in the meat. It can also help to clarify the wine when being supplied to beer and further prevent turbidity.
4. Safety and Handling
5.1 Safety Statements
S24/25
5.2 DisposalMethods
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.
5.3 Exposure Standards and Regulations
Sodium hexametaphosphate used as a sequestrant in food for human consumption is generally recognized as safe when used in accordance with good manufacturing practice.
Sodium hexametaphosphate used as a sequestrant in animal drugs, feeds, and related products is generally recognized as safe when used in accordance with good manufacturing or feeding practice.
5.4 Formulations/Preparations
Sodium hexametaphosphate detergents, calgon, giltex, quadrafos, hagan phosphate, micromet: mixtures containing Graham's salt as principal agent. Supplied in form of powder, flakes, & small, broken, glass-like particles.
... SEVERAL SODIUM HEXAMETAPHOSPHATE PREPN LABELED "REAGENT GRADE"... ARE TYPICAL COMMERCIAL MIXTURES OF VARYING CHAIN LENGTHS ... IT IS, THEREFORE, INCORRECT TO DESIGNATE THEM AS CHEMICALLY PURE OR REAGENT-GRADE ... .
Has molecular ratio of 1.1 Na2O:1 P2O5 with guaranteed min of 67% P2O5. Several specialized compositions are available. /Calgon/
/Vitreous sodium phosphate (sodium hexametaphosphate) found in/ Calgon; Calgon Bath Oil Beads; Calgon Bouquet; and Calgon Bubble Bath.
5.5 Protective Equipment and Clothing
EYE CONTACT WITH CONCENTRATED ALKALI CAUSES CONJUNCTIVAL EDEMA & CORNEAL DESTRUCTION. A. ALKALIES PENETRATE SKIN SLOWLY. EXTENT OF DAMAGE THEREFORE DEPENDS ON DURATION OF CONTACT. B. CHRONIC POISONING (FROM SKIN CONTACT). CHRONIC DERMATITIS MAY FOLLOW REPEATED CONTACT ... . /ALKALIES/
5.6 Report

Reported in EPA TSCA Inventory.

5.7 Safety

Poison by intravenous route. Moderately toxic by intraperitoneal and subcutaneous routes. Mildly toxic by ingestion. When heated to decomposition it emits toxic fumes of POx and Na2O. See also PHOSPHATES.
Safety Statements: 24/25
S24/25:Avoid contact with skin and eyes.

5.8 Skin, Eye, and Respiratory Irritations
EYE CONTACT WITH CONCENTRATED ALKALI CAUSES CONJUNCTIVAL EDEMA & CORNEAL DESTRUCTION. A. ALKALIES PENETRATE SKIN SLOWLY. EXTENT OF DAMAGE THEREFORE DEPENDS ON DURATION OF CONTACT. B. CHRONIC POISONING (FROM SKIN CONTACT). CHRONIC DERMATITIS MAY FOLLOW REPEATED CONTACT ... . /ALKALIES/
5.9 Specification

?Sodium hexametaphosphate , its cas register number is 10124-56-8. It also can be called?Graham's salt ; Metaphosphoric acid, hexasodium salt ; Sodium polymetaphosphate ; Calgon ; Calgon (old) ; Calgon S ; Caswell No. 772 ; Chemi-charl ; EPA Pesticide Chemical Code 076402 ; FEMA 3027 ; Graham's salt ; HMP ; HSDB 5053 ; Hexametaphosphate, sodium salt ; Hexasodium hexametaphosphate ; Hexasodium metaphosphate ; Medi-Calgon ; Metaphosphoric acid (H6P6O18), hexasodium salt ; Metaphosphoric acid, hexasodium salt ; Natrium hexametaphosphat ; Natrium hexametaphosphat [German] ; Phosphate, sodium hexameta ; Polyphos ; SHMP ;?Sodium hexametaphosphate (Na6P6O18) ; Sodium phosphate (Na6P6O18) ; Sodium phosphate, tribasic ; Sodium polymeta phosphate ; Metaphosphoric acid (H6P6O18), hexasodium salt ; Metaphosphoric acid (H6P6O18), sodium salt (1:6) ; Metaphosphoric acid, hexasodium salt ; Sodium metaphosphate ; Sodium phosphate, tribasic . It is a?white granular solid.?It hydrolyzes in aqueous solution, particularly under acidic conditions, to sodium trimetaphosphate and sodium orthophosphate .

5.10 Toxicity

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mouse LD50 intraperitoneal 870mg/kg (870mg/kg) KIDNEY, URETER, AND BLADDER: "CHANGES IN TUBULES (INCLUDING ACUTE RENAL FAILURE, ACUTE TUBULAR NECROSIS)" Revue d'Epidemiologie, Medecine Sociale et Sante Publique. Vol. 10, Pg. 391, 1962.
mouse LD50 intravenous 62mg/kg (62mg/kg) ? Arzneimittel-Forschung. Drug Research. Vol. 7, Pg. 445, 1957.
mouse LD50 oral 4320mg/kg (4320mg/kg) PERIPHERAL NERVE AND SENSATION: FLACCID PARALYSIS WITHOUT ANESTHESIA (USUALLY NEUROMUSCULAR BLOCKAGE)

BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY)

BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD
Gigiena i Sanitariya. For English translation, see HYSAAV. Vol. 38(9), Pg. 19, 1973.
mouse LD50 subcutaneous 1300mg/kg (1300mg/kg) ? Arzneimittel-Forschung. Drug Research. Vol. 7, Pg. 445, 1957.
rabbit LDLo intravenous 140mg/kg (140mg/kg) ? Naunyn-Schmiedeberg's Archiv fuer Experimentelle Pathologie und Pharmakologie. Vol. 169, Pg. 238, 1933.
rat LD50 oral 6200mg/kg (6200mg/kg) PERIPHERAL NERVE AND SENSATION: FLACCID PARALYSIS WITHOUT ANESTHESIA (USUALLY NEUROMUSCULAR BLOCKAGE)

BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY)

BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD
Gigiena i Sanitariya. For English translation, see HYSAAV. Vol. 38(9), Pg. 19, 1973.

5. MSDS

2.Hazard identification

2.1 Classification of the substance or mixture

Not classified.

2.2 GHS label elements, including precautionary statements

Pictogram(s) No symbol.
Signal word

No signal word.

Hazard statement(s)

none

Precautionary statement(s)
Prevention

none

Response

none

Storage

none

Disposal

none

2.3 Other hazards which do not result in classification

none

6. NMR Spectrum
7. Computational chemical data
  • Molecular Weight:611.770386g/mol
  • Molecular Formula:Na6O18P6
  • Exact Mass:611.68965
  • Monoisotopic Mass:611.68965
  • Complexity:513
  • Rotatable Bond Count:0
  • Hydrogen Bond Donor Count:0
  • Hydrogen Bond Acceptor Count:18
  • Topological Polar Surface Area:296
  • Heavy Atom Count:30
  • Defined Atom Stereocenter Count:0
  • Undefined Atom Stereocenter Count:0
  • Defined Bond Stereocenter Count:0
  • Undefined Bond Stereocenter Count:0
  • Isotope Atom Count:0
  • Covalently-Bonded Unit Count:7
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