Magnesium phosphate

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Description

Magnesium phosphate occurs in three forms: monobasic, dibasic, and tribasic. Dibasic and tribasic magnesium phosphate are the most common. They are used as antacids, food additives, polishing agents, and as stabilizers in plastics. Monobasic magnesium phosphate is one type of magnesia cement, magnesium phosphate cement (MAP). It is formed by the reaction between magnesium oxide and a soluble phosphate, such as ammonium phosphate monobasic (NH4H2PO4). MAP sets rapidly with very high early strength. It is known for good adhesion as well as good water and freeze thaw resistance.

Synonyms and Related Terms

magnesium hydrogen phosphate; magnesia cement; magnesium phosphate cement; MAP

Other Properties

Soluble in acids. Insoluble in water

Composition MGHPO4.3H2O
CAS 7757-86-0
Density 2.13
Molecular Weight 174.33

Hazards and Safety

Mallinckrodt Baker: MSDS

Sources Checked for Data in Record

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entries 5718-5720

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