Substance profile
Potassium Fluoride
Potassium Fluoride is white cubic crystals.
01 · Identification
What Potassium Fluoride is
Potassium Fluoride is white cubic crystals. Its molecular formula is FK and its molecular weight is 58.097 g/mol. It boils at 1502 °C, melts at 858 °C, is soluble in water.
Under the GHS it carries the signal word Danger.
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 |
|---|---|
| H331 | Toxic if inhaled. |
| H311 | Toxic in contact with skin. |
| H301 | Toxic if swallowed. |
Precautionary statements: P260, P270, P271, P280, P301, P302, P304, P310, P330, P352
03 · Physical and chemical properties
Potassium Fluoride 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 | 1502 °C (2735.6 °F) | HSDB | |
| 1505 °C (2741 °F) | at 760 mmHg | CAMEO | |
| 1502 °C (2735.6 °F) | at 760 mmHg | DOE PAC | |
| Melting point | 858 °C (1576.4 °F) | HSDB | |
| 19.3 °C (66.7 °F) | Tetrahydrate | HSDB | |
| 857.78 °C (1576 °F) | CAMEO | ||
| Density | 2.48 g/cm³ | HSDB | |
| 2.48 g/cm³ | at 25 °C | DOE PAC | |
| Solubility | Soluble in water, hydrogen fluoride; insoluble in alcohol | HSDB | |
| 102 g/100 g water at 25 °C | at 25 °C | HSDB | |
| greater than or equal to 100 mg/mL at 66 °F (NTP, 1992) | at 18.89 °C | CAMEO | |
| Vapor pressure | 0.7501 mmHg | at 869 °C | HSDB |
| 0.75 mmHg | at 869 °C | DOE PAC | |
| Corrosivity | Aqueous solution corrodes glass and porcelain | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
04 · Handling and storage
Storing and handling Potassium Fluoride
Incompatible materials
Platinum is attacked by bromine trifluoride at 280 °C in presence of potassium fluoride.
Source: Hazardous Substances Data Bank (HSDB)
Reactivity
POTASSIUM FLUORIDE reacts with acids to evolve corrosive and toxic hydrogen fluoride. Aqueous solutions corrode glass and consequently are prepared and stored in polyethylene containers. The pure solid may be stored in glass containers. Reacts violently with (Pt + BrF3). [NTP 1992].
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Potassium Fluoride in the storage compatibility matrix →