Monoammonium Phosphate
MAP, Ammonium Dihydrogen Phosphate
- CAS
- 7722-76-1
- EC
- 231-764-5
- Food Code
- E342
- Sectors
- Agriculture, Food & Nutrition
Monoammonium phosphate (CAS 7722-76-1) is a white crystalline inorganic salt formed from ammonia and phosphoric acid, highly soluble in water and non-hygroscopic, and is used as a nitrogen and phosphorus source in fertilizers, as a flame suppressant in fire extinguishing powders, and as a yeast nutrient.
Typical Properties
| Molecular formula | H3N.H3O4P |
|---|---|
| Molecular weight | 115.03 g/mol |
| Appearance | Ammonium phosphate is a white crystalline or powdery substance. |
| Form | Solid |
| Color | White or colorless |
| Odor | brilliant wh. cryst. or powd., odorless |
| Melting point | 190 °C |
| Boiling point | 376.1 °C (decomp) |
| Density | 1.803 g/cm³ |
| Water solubility | 368 g/L (20 °C) |
| pH | 3.8-4.4 (25°C, 50mg/mL in H2O) |
| GHS signal word | Warning · Irritant / harmful |
| HS code | 31054000 |
| Grades available | Food Grade, Technical Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Monoammonium Phosphate
Applications
Used in fertilizers as a nitrogen and phosphorus source. In fire extinguishing powders, it acts as a flame suppressant. Also employed in yeast nutrients, metal finishing, and corrosion inhibitors.
Safety & Risks
Stable and non-toxic; avoid exposure to moisture and high heat.
Packaging
Supplied in 25 kg plastic-lined woven bags or 1,000 kg big bags. Store cool, dry, and tightly sealed.