Sodium hexametaphosphate

Sodium hexametaphosphate

Chembox new
Reference= ["Merck Index", 12th Edition, Sodium polymetaphosphate, 8814]
ImageFile = sodium hexametaphosphate.png ImageSize = 200px
Section1 = Chembox Identifiers
CASNo = 10124-56-8
Section2 = Chembox Properties
Formula = (NaPO3)6
Appearance = White, odorless, crystalline powder
MolarMass = 611.77
MeltingPt = 550.0 °C
BoilingPt = 1500.0 °C
Density = 2.484 g/cm³
Solvent = other solvents
SolubleOther = Easily soluble in water Insoluble in organic solvents
Section3 = Chembox Structure
Structure =
Section7 = Chembox Hazards
ExternalMSDS = [http://216.239.51.104/search?q=cache:l0nrr8muKpIJ:www.sciencelab.com/xMSDS-Sodium_hexametaphosphate-9924995+sodium+hexametaphosphate+mdms&hl=en&ct=clnk&cd=1&gl=us&client=opera Sodium hexametaphosphate MSDS]
NFPA-H = 1
NFPA-F =
NFPA-R =
MainHazards = Ingestion:
May cause irritation
Inhalation:
Irritant
Skin:
May cause irritation
Eyes: Irritant
LD50 = 3053 mg/kg

Sodium hexametaphosphate (SHMP) is a hexamer of composition (NaPO3)6. [Van Wazer, John R. "Phosphorus and its compounds". New York : Interscience Publishers (1958)] Sodium hexametaphosphate of commerce is typically a mixture of polymeric metaphosphates, of which the hexamer is one, and is usually the compound referred to by this name. It is more correctly termed sodium polymetaphosphate. It is prepared by melting monosodium orthophosphate, followed by rapid cooling. SHMP hydrolyzes in aqueous solution, particularly under acidic conditions, to sodium trimetaphosphate and sodium orthophosphate. SHMP is used as a sequestrant and has applications in a wide variety of industries, including as a food additive in which it is used under the E number E452i. Sodium carbonate is sometimes added to SHMP to raise the pH to 8.0-8.6, which produces a number of SHMP products used for water softening and detergents. Also used as a dispersing agent to break down clay and other soil types.

Ceramic process

One of the lesser-known uses for sodium hexametaphosphate is as a deflocculant in the making of Terra sigillata, a ceramic technique using a fine particled slip. The sodium hexametaphosphate causes the heavy particles in the slip to drop to the bottom allowing the fine particles to be siphoned off and applied to a green ware ceramic surface.

Other Uses

Sodium hexametaphosphate is also a whitening ingredient included in Crest Pro-Health, Vivid White and Vivid White Night. [ [http://www.crest.com/vivid/faq.jsp Crest Vivid White Toothpaste ] ]

It is also used as an additive in Rubicon Mango drinks, Diet Lipton teas and Life Brand naturally flavored bottled water.

Health concern

Some individuals may experience an allergic reaction to the ingestion of sodium hexametaphosphate that may produce mild chest pain.Fact|date=April 2008 One case of this allergic reaction was reported to have been due to trace amounts of sodium hexametaphosphate found in bottled water.Fact|date=April 2008

Other names

*Calgon S
*Glassy sodium
*Graham's Salt
*Hexasodium metaphosphate
*Hexasodium salt
*Metaphosphoric acid

References

External links

* [http://www.ohsah.bc.ca/index.php?section_id=393& Occupational Health and Safety Agency for Healthcare in British Columbia]
* [http://www.phosphatesfacts.org/uses.asp Use of phosphates (including sodium hexametaphosphate) in industry]


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