| Chemistry name: | ammonium biborate |
| M Formula: | NH4HB4O7•3H2O |
| Properties: | |
| Colorless crystals, efflorescent with loss of ammonia. Soluble in water. D 2.38–2.95. Noncombustible. | |
| Derivation: | |
| Action of ammonium hydroxide on boric acid with subsequent crystallization. | |
| Hazard: | |
| Evolves irritating fumes, especially when heated. | |
| Use: | |
| Fireproofing compounds, electrical condensers, herbicide. | |