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 · Identifiers
Potassium Fluoride identifiers and molecular data
Potassium Fluoride CAS number and EC number
Potassium Fluoride molecular formula and molecular weight
03 · GHS classification
Potassium Fluoride hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Potassium Fluoride pictograms and signal word
Potassium Fluoride hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Acute toxicity - oral GHS chapter 3.1 | Category 3 | H301 | GHS06 |
| Acute toxicity - dermal GHS chapter 3.1 | Category 3 | H311 | GHS06 |
| Acute toxicity - inhalation GHS chapter 3.1 | Category 3 | H331 | GHS06 |
Potassium Fluoride hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H331 | Toxic if inhaled. |
| H311 | Toxic in contact with skin. |
| H301 | Toxic if swallowed. |
This page lists only the codes assigned to Potassium Fluoride. The full reference lives on the hazard statements hub, the precautionary statements hub and the GHS pictograms hub.
Safety Data Sheet
Getting an SDS for Potassium Fluoride
A Safety Data Sheet is written for a product, not for a substance: the supplier of the grade you actually buy issues it, so two suppliers of Potassium Fluoride issue two different sheets. That is why there is no single authoritative SDS for a substance to download — what there is, is the job of collecting the sheets for the products you hold and keeping them current as suppliers revise them.
04 · Precautionary statements
Potassium Fluoride precautionary statements
CLP Annex VI assigns 10 precautionary statements to Potassium Fluoride. They are grouped the way a label groups them: what to do before handling, what to do when something has already happened, how to store it and how to dispose of it.
Prevention
What to do before and during handling so the hazard never happens.
Response
What to do once exposure, spillage or fire has already happened.
Reading the notation. … is a blank the supplier fills in — not a truncated sentence.· [square brackets] mark a part printed only when it applies.
05 · Names in the regulation
Potassium Fluoride name in 23 EU languages
CLP Annex VI Part 3 is published in every language edition of the regulation, and the identification column is written out in each of them. Nothing below is translated by us: each line is the name as that edition prints it. Under Art. 18(2) the substance name from Annex VI is a lawful product identifier, so this is the wording to put on a label going to that market — and where the cell lists several designations, any one of them qualifies.
| Language | Name in CLP Annex VI Part 3 |
|---|---|
| Bulgarian български | калиев флуорид |
| Spanish español | Fluoruro de potasio |
| Czech čeština | fluorid draselný |
| Danish dansk | kaliumfluorid |
| German Deutsch | Kaliumfluorid |
| Estonian eesti | kaaliumfluoriid |
| Greek ελληνικά | φθοριούχο κάλιο |
| English English | potassium fluoride |
| French français | fluorure de potassium |
| Croatian hrvatski | kalijev fluorid |
| Italian italiano | fluoruro di potassio |
| Latvian latviešu | kālija fluorīds |
| Lithuanian lietuvių | kalio fluoridas |
| Hungarian magyar | kálium-fluorid |
| Maltese Malti | fluworur tal-potassju |
| Dutch Nederlands | kaliumfluoride |
| Polish polski | fluorek potasu |
| Portuguese português | fluoreto de potássio |
| Romanian română | fluorură de potasiu |
| Slovak slovenčina | fluorid draselný |
| Slovenian slovenščina | kalijev fluorid |
| Finnish suomi | kaliumfluoridi |
| Swedish svenska | kaliumfluorid |
All 23 language editions of Annex VI carry this entry. Irish is the twenty-fourth official EU language and has no line here for a different reason: no consolidated CLP text has ever been published in Irish, so there is no Irish edition of Annex VI to quote a name from. Source: consolidated CLP, CELEX 02008R1272, language editions. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic.
06 · Label elements
Potassium Fluoride GHS label elements
Everything CLP Annex VI fixes for Potassium Fluoride, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
Potassium Fluoride
- Toxic if inhaled.
- Toxic in contact with skin.
- Toxic if swallowed.
- Do not breathe dust/fume/gas/mist/vapours/spray.
- Do not eat, drink or smoke when using this product.
- Use only outdoors or in a well-ventilated area.
- Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/…
- IF SWALLOWED:
- IF ON SKIN:
- IF INHALED:
- Immediately call a POISON CENTER/doctor/…
- Rinse mouth.
- Wash with plenty of water/…
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Potassium Fluoride in the GHS label constructor →
07 · Health hazards
Potassium Fluoride health hazards and exposure limits
Potassium Fluoride hazard summary
Toxic by ingestion; A skin, eye, and mucous membrane irritant; Contact with molten substance can cause burns; Reacts with acids to produce toxic hydrogen fluoride gas; [CAMEO]
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
Potassium Fluoride occupational exposure limits
| Limit | Value | Source |
|---|---|---|
| PEL | 2.5 [mg/m3], as F | Haz-Map, Information on Hazardous Chemicals and Occupational Diseases |
These are United States values. The European Union sets its own indicative and binding limits, and the figure that applies at a given workplace is the one in the local regulation — not the one shown here.
08 · 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.
Potassium Fluoride boiling point
| 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 |
Potassium Fluoride melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | 858 °C (1576.4 °F) | HSDB | |
| 19.3 °C (66.7 °F) | Tetrahydrate | HSDB | |
| 857.78 °C (1576 °F) | CAMEO |
Potassium Fluoride density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 2.48 g/cm³ | HSDB | |
| 2.48 g/cm³ | at 25 °C | DOE PAC |
Potassium Fluoride solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| 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 |
Potassium Fluoride vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 0.7501 mmHg | at 869 °C | HSDB |
| 0.75 mmHg | at 869 °C | DOE PAC |
Potassium Fluoride corrosivity
| Property | Value | Conditions | Source |
|---|---|---|---|
| Corrosivity | Aqueous solution corrodes glass and porcelain | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Handling and storage
Potassium Fluoride storage 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)
Potassium Fluoride 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 →
10 · Transport
Potassium Fluoride UN number and transport classification
Transport classification is a separate system from the GHS classification above. It decides how a package is marked and how a load may be carried; it does not follow from the workplace label, and the workplace label does not follow from it. The entries below are linked by CAS number, never by name.
The same CAS number is shipped under more than one UN number. Which entry applies follows from the form and the concentration of the consignment — read the proper shipping name, not the CAS.
Potassium Fluoride under UN 1812 — shipping name, class and packing group
Europe · ADR 2025, Table A
| Proper shipping name (3.1.2) | Class | Classification code | PG | Labels (column 5) |
|---|---|---|---|---|
| POTASSIUM FLUORIDE, SOLID | 6.1 | T5 | III | |
Source: ADR 2025, Table A of Chapter 3.2 · ECE/TRANS/352 Vol. I (UNECE). Class 6.1 is “Toxic substances” (ADR 2.1.1.1).
United States · 49 CFR 172.101 Hazardous Materials Table
| Proper shipping name (column 2) | Class or division | PG | Labels (column 6) |
|---|---|---|---|
| Potassium fluoride, solid | 6.1 | III | |
Source: 49 CFR 172.101 Hazardous Materials Table · eCFR, revision 2026-08-03. Class 6.1 is “Poisonous materials” (49 CFR 173.2).
Potassium Fluoride under UN 3422 — shipping name, class and packing group
Europe · ADR 2025, Table A
| Proper shipping name (3.1.2) | Class | Classification code | PG | Labels (column 5) |
|---|---|---|---|---|
| POTASSIUM FLUORIDE SOLUTION | 6.1 | T4 | III | |
Source: ADR 2025, Table A of Chapter 3.2 · ECE/TRANS/352 Vol. I (UNECE). Class 6.1 is “Toxic substances” (ADR 2.1.1.1).
United States · 49 CFR 172.101 Hazardous Materials Table
| Proper shipping name (column 2) | Class or division | PG | Labels (column 6) |
|---|---|---|---|
| Potassium fluoride solution | 6.1 | III | |
Source: 49 CFR 172.101 Hazardous Materials Table · eCFR, revision 2026-08-03. Class 6.1 is “Poisonous materials” (49 CFR 173.2).
11 · Questions
Potassium Fluoride — frequently asked questions
What is the CAS number of Potassium Fluoride?
The CAS number of Potassium Fluoride is 7789-23-3. Its EC number is 232-151-5.
What is the chemical formula of Potassium Fluoride?
The molecular formula of Potassium Fluoride is FK and its molecular weight is 58.097 g/mol.
What does a Potassium Fluoride label have to show?
Under CLP Annex VI the label for Potassium Fluoride carries the pictogram Skull and crossbones and the signal word is Danger.
Is Potassium Fluoride flammable?
CLP Annex VI assigns Potassium Fluoride no flammability hazard class. That is not a statement that it cannot burn: the harmonised list only records the hazards that were assessed for it.
Is Potassium Fluoride a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Potassium Fluoride. Annex VI is a list of agreed classifications, not a list of substances found safe, so this is an absence of a classification rather than a clean bill of health.
What is the exposure limit for Potassium Fluoride?
The US occupational exposure limit reported for Potassium Fluoride is 2.5 [mg/m3], as F (Haz-Map, Information on Hazardous Chemicals and Occupational Diseases). Limits differ by country: the EU sets its own indicative and binding values, and the figure that applies at a given workplace is the one in the local regulation.
What is the boiling point of Potassium Fluoride?
The boiling point reported for Potassium Fluoride is 1502 °C (2735.6 °F) (HSDB).
What is the melting point of Potassium Fluoride?
The melting point reported for Potassium Fluoride is 858 °C (1576.4 °F) (HSDB).
Nearby
Substances next to Potassium Fluoride
Keep going: substances starting with P, or search the whole database by name, CAS number, pictogram or signal word.