Substance profile
Ammonium bifluoride
Ammonium bifluoride is rhombic or tetragonal crystals and is odorless.
01 · Identification
What Ammonium bifluoride is
Ammonium bifluoride is rhombic or tetragonal crystals and is odorless. Its molecular formula is F2H5N and its molecular weight is 57.044 g/mol. It boils at 240 °C, melts at 126 °C.
Under the GHS it carries the signal word Danger. It is classed as corrosives.
Other names for Ammonium bifluoride
- ammonium hydrogen difluoride
02 · GHS classification
Hazards and label elements
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
| Code | Hazard statement |
|---|---|
| H301 | Toxic if swallowed. |
| H314 | Causes severe skin burns and eye damage. |
Precautionary statements: P260, P270, P280, P301, P310, P330, P331
03 · Physical and chemical properties
Ammonium bifluoride properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 240 °C (464 °F) | at 760 mmHg | DOE PAC |
| 240 °C (464 °F) | decomposes, decomposes | HSDB | |
| 239.5 °C (463.1 °F) | decomposes, at 760 mmHg | CAMEO | |
| Melting point | 125.6 °C (258.1 °F) | HSDB | |
| 125.56 °C (258 °F) | CAMEO | ||
| 126 °C (258.8 °F) | DOE PAC | ||
| Density | 1.5 g/cm³ | HSDB | |
| 1.5 g/cm³ | at 20 °C | CAMEO | |
| 1.5 g/cm³ | at 25 °C | DOE PAC | |
| Solubility | Solubility in 90% ethanol = 1.73X10+5 mg/L | HSDB | |
| In water, 6.02X10+5 mg/L at 20 °C | at 20 °C | HSDB | |
| Corrosivity | Will etch glass | HSDB | |
| In presence of moisture will corrode glass, cement, and most metals. | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Ammonium bifluoride
Storage conditions
Solution /USP topical fluoride solution/ should be stored in Plax (plastic), paraffin lined, or pyrex bottles.
Source: Hazardous Substances Data Bank (HSDB)
Incompatible materials
... Reacts with silicon containing materials like glass or ceramics at room temperature (formation of SiF4). It also reacts with concentrated acids (formation of HF) and concentrated alkaline solutions (formation of NH3).
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
AMMONIUM BIFLUORIDE reacts violently with bases. In presence of moisture will corrode glass, cement, and most metals. Flammable hydrogen gas may collect in enclosed spaces. Do not use steel, nickel, or aluminum containers (USCG, 1999).
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Ammonium bifluoride in the storage compatibility matrix →