Diammonium phosphate
CAS 7783-28-0H9N2O4P132.06 g/mol
Diammonium hydrogen phosphate is an inorganic phosphate, being the diammonium salt of phosphoric acid. The commercially available fertilizer has an analysis of 18-46-0 (N-P2O5-K2O) and is marketed under the name diammonium phosphate or DAP. It has a role as a fertilizer. It is an inorganic phosphate and an ammonium salt.
IUPAC: diazanium;hydrogen phosphate
PubChem
Physical & Chemical Properties
| Melting Point | 155 °C with decomposition |
| Density | Diammonium: 1.8 at 68.0 °F Monoammonium: 1.6 at 20 °C (USCG, 1999) |
| Solubility | Insoluble in ethanol, acetone |
| pH | pH about 8 |
| Appearance | Ammonium phosphate is a white solid with a weak odor of ammonia. Sinks and mixes with water. (USCG, 1999) |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
TSCA
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
View sourceGlobal Trade Intelligence
No trade flow data available for this chemical.
HS Code(s): 3105
Data: UN Comtrade
Suppliers on Chem-Exchange
No suppliers currently listing Diammonium phosphate
List Your ProductsSafety Data Sheets
No SDS documents available
Upload an SDS document