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
- Website address 1 Comment: 'Magnesia Cements" by Dr. Mark A. Shand, Premier Chemicals Research Center, http://www.premierchemicals.com/corner/articles/cements.htm (accessed July 9, 2007)