POTASSIUM BIFLUORIDE
potassium bifluoride
CAS: 7789-29-9
Molecular Formula: F2HK
POTASSIUM BIFLUORIDE - Names and Identifiers
POTASSIUM BIFLUORIDE - Physico-chemical Properties
| Molecular Formula | F2HK |
| Molar Mass | 78.1 |
| Density | 2.37g/mLat 25°C(lit.) |
| Melting Point | 239°C(lit.) |
| Water Solubility | 39 g/100 mL (20 ºC) |
| Appearance | Crystals or Crystalline Powder |
| Specific Gravity | 2.37 |
| Color | White to light gray |
| Exposure Limit | ACGIH: TWA 2.5 mg/m3NIOSH: IDLH 250 mg/m3 |
| Merck | 14,7610 |
| Sensitive | Hygroscopic |
| Physical and Chemical Properties | Characters colorless tetragonal or cubic crystal. Slightly sour odor. Bicrystalline compound. melting point 225 ℃ (decomposition) relative density 2.37 solubility soluble in water, soluble in potassium acetate, insoluble in ethanol. The aqueous solution was acidic. |
| Use | Used in the manufacture of anhydrous hydrogen fluoride, pure potassium fluoride, optical glass, elemental fluorine, also used as glass etchant, welding flux, wood preservative, etc |
POTASSIUM BIFLUORIDE - Risk and Safety
| Risk Codes | R25 - Toxic if swallowed R34 - Causes burns |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S37 - Wear suitable gloves. S22 - Do not breathe dust. |
| UN IDs | UN 3421 8/PG 2 |
| WGK Germany | 1 |
| RTECS | TS6650000 |
| FLUKA BRAND F CODES | 3 |
| TSCA | Yes |
| HS Code | 28261990 |
| Hazard Note | Corrosive |
| Hazard Class | 8 |
| Packing Group | II |
POTASSIUM BIFLUORIDE - Upstream Downstream Industry
| Raw Materials | Hydrofluoric Acid Hydrofluoric Acid Potassium hydroxide Potassium carbonate Hydrofluoric Acid |
| Downstream Products | Sulphur hexafluoride |
POTASSIUM BIFLUORIDE - Nature
Open Data Verified Data
colorless square crystal. Melting point of 238.7 deg C; d 2. 37. Hydrogen fluoride is released by absorption of water in humid air. Soluble in water, solubility in water (g/lOOmL):30.1 (10 C)1 39.2 (20 C)1 114.0(80c). The aqueous solution is acidic, corrosive and highly irritating. Soluble in ethanol, but insoluble in anhydrous ethanol. Absorption of moisture or water will produce a large number of corrosive smoke. Toxic and corrosive flue gas is generated by high thermal decomposition.
Last Update：2025-06-10 22:55:16
POTASSIUM BIFLUORIDE - Preparation Method
Open Data Verified Data
potassium hydroxide was dissolved in water and reacted with hydrofluoric acid to obtain potassium fluoride. The solution was filtered, acidified with hydrofluoric acid, cooled, controlled to Ph 2 to 3, cooled, crystallized, centrifuged, and dried.
Last Update：2025-06-10 22:55:16
POTASSIUM BIFLUORIDE - Application
Open Data Verified Data
electrolytes for production of anhydrous hydrogen fluoride, pure potassium fluoride, and elemental fluorine. Also used in the manufacture of optical glass, etching glass. It can be used as a welding flux for silver products, a preservative for Wood, a masking agent, a catalyst for benzene alkylation, and the like.
Last Update：2025-08-19 16:24:40
POTASSIUM BIFLUORIDE - Safety
Open Data Verified Data
It has a strong stimulating effect on eyes, skin and mucosa. Poisoning after inhalation, ingestion, or absorption through the skin. Staff should be well protected, if accidentally touch the eyes, should immediately rinse with a large amount of flowing water. The working environment should have good ventilation conditions. Store in a cool, dry, well-ventilated warehouse. Keep away from fire and heat source. Keep the container sealed. Moisture-proof, sunscreen. Should be stored separately from acids, edible chemical raw materials, etc.
Last Update：2025-06-10 22:55:16
POTASSIUM BIFLUORIDE - Reference Information
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| toxicity | This product is toxic, the maximum allowable concentration is 2.5 mg/m3. Corrosive, irritating to the skin and mucous membranes. Thermal decomposition will produce hydrogen fluoride. Protective equipment must be worn during operation to avoid contact with the skin. See hydrogen fluoride for others. |
| Application | used in the manufacture of anhydrous hydrogen fluoride, pure potassium fluoride, optical glass, elemental fluorine, also used as glass etchant, welding flux, wood preservatives, etc. for the production of anhydrous hydrogen fluoride, pure potassium fluoride, elemental Fluorine Production of electrolyte. Also used in the manufacture of optical glass, etching glass. It can be used as a welding flux for silver products, a preservative for Wood, a masking agent, a catalyst for benzene alkylation, and the like. It is used as wood preservative, etching glass, welding flux for silver products and other fluorine salts. It is used as a masking agent and metallurgical flux, and also as a catalyst for the production of fluorine alkylated benzene. Etch glass. Manufacture of fluorine. Metallurgical flux. Preparation of 2-fluoro sugars; Monofluorination of inorganic phosphates. |
| production method | potassium hydroxide method solid potassium hydroxide is dissolved in an equal amount of water in a neutralization tank, and then hydrofluoric acid (or anhydrous hydrofluoric acid) is used. The reaction proceeds to produce potassium fluoride. After filtration, it is acidified with hydrofluoric acid (or anhydrous hydrofluoric acid) in an acidifier while cooling with water. Control the pH value of 2~3. The reaction solution was cooled to 50 to 60 ° C., and then the crystals were cooled in a cooling tank. After centrifugal separation, drying at 170~200 deg C for 8H, prepared potassium hydrogen fluoride product. Its KOH HF → KF H2OKF HF → KHF2 |
| category | corrosive article |
| flammability hazard characteristics | decomposition of toxic hydrogen fluoride gas in case of tide and water; thermal decomposition of toxic hydrogen fluoride gas |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; Stored separately from acid |
| extinguishing agent | water mist |
| Occupational Standard | TLV-TWA 2.5 mg (fluorine)/m3; Tel 5 mg (fluorine)/M3 |
Last Update：2024-04-10 22:29:15
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Raw Materials for POTASSIUM BIFLUORIDE
Downstream Products for POTASSIUM BIFLUORIDE