POTASSIUM BOROFULUORIDE
Potassium Tetrafluoroborate
CAS: 14075-53-7
Molecular Formula: BF4K
POTASSIUM BOROFULUORIDE - Names and Identifiers
POTASSIUM BOROFULUORIDE - Physico-chemical Properties
| Molecular Formula | BF4K |
| Molar Mass | 125.9 |
| Density | 2.505g/mLat 25°C(lit.) |
| Melting Point | 530°C(lit.) |
| Boling Point | 960.85 (310 torr) |
| Water Solubility | 4.4 g/L (20 ºC) |
| Appearance | White crystal |
| Color | White to light gray |
| Exposure Limit | ACGIH: TWA 2.5 mg/m3NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3 |
| Merck | 14,7686 |
| Storage Condition | Sealed in dry,Room Temperature |
| Stability | Stable. May decompose on exposure to water or moisture. Incompatible with metals. |
| Sensitive | Moisture Sensitive |
| Refractive Index | 1.3245 |
| MDL | MFCD00011395 |
| Physical and Chemical Properties | Properties white powder or gelatinous crystals. Non-hygroscopic. Bitter in taste. melting point 530 ℃ relative density 2.50 solubility: slightly soluble in water and hot ethanol, insoluble in cold ethanol. |
| Use | Used as flux flux, also used in metallurgical industry and the preparation of boron trifluoride and other fluoride raw materials |
POTASSIUM BOROFULUORIDE - Risk and Safety
| Risk Codes | R36/37/38 - Irritating to eyes, respiratory system and skin. R34 - Causes burns |
| Safety Description | S37/39 - Wear suitable gloves and eye/face protection S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S24/25 - Avoid contact with skin and eyes. |
| UN IDs | 3260 |
| WGK Germany | 1 |
| RTECS | ED2800000 |
| TSCA | Yes |
| HS Code | 28269090 |
| Hazard Note | Corrosive/Moisture Sensitive |
POTASSIUM BOROFULUORIDE - Upstream Downstream Industry
| Raw Materials | Fluorosilicic acid Hydrofluoric Acid Potassium chloride Orthoboric acid Hydrofluoric Acid Potassium hydroxide Sodium hydroxide Potassium carbonate |
POTASSIUM BOROFULUORIDE - Nature
Open Data Verified Data
white powder or gel-like crystals. Non-hygroscopic. Bitter in taste. Crystallization from an aqueous solution results in a hexagonal prismatic crystal. The relative density was 2. 50. Melting point 530 °c. Slightly soluble in water and hot ethanol, insoluble in cold ethanol. Decomposition begins at the time of melting. It can be decomposed by strong acid such as sulfuric acid to generate boron trifluoride. Fluoride and borate are formed on melting with alkali metal carbonates. Toxic!
Last Update：2025-06-10 22:55:16
POTASSIUM BOROFULUORIDE - Preparation Method
Open Data Verified Data
- potassium hydroxide fluoroborate method: hydrofluoric acid and boric acid were put into a reaction kettle, the charge ratio of the two was 25:6.2 (mass ratio), the temperature was not more than 40 ° C., and the reaction was carried out for 6 hours. The obtained fluoroboric acid was introduced into a neutralization tank, and a neutralization reaction was carried out with potassium hydroxide having a concentration of 5 mol/L under stirring and cooling (until discoloration of methyl orange). The precipitated potassium fluoroborate crystals were centrifuged, washed and dried to obtain potassium fluoroborate product.
- potassium fluoborate neutralization method: the fluoboric acid was neutralized with a saturated potassium carbonate solution under stirring in a coating container until the color of methyl orange changed. The precipitated potassium fluoroborate was centrifuged, washed and dried to obtain potassium fluoroborate product.
Last Update：2022-01-01 10:58:58
POTASSIUM BOROFULUORIDE - Application
Open Data Verified Data
used as a flux for thermal welding and brazing, al-MG is cast as a raw material for producing a boron-containing alloy, and used as a filler in a heavy-duty grinding wheel using a resin as an abrasive binder. In the Fusion and Fusion of silver, gold, stainless steel, can pick up the net light metal slag. It is a raw material for the preparation of boron trifluoride and other fluoride salts. It is also used in electrochemical processes and reagents.
Last Update：2025-08-19 16:24:40
POTASSIUM BOROFULUORIDE - Safety
Open Data Verified Data
with glass bottles, jacket carton packaging. 0.5kg per bottle. Should be stored in a cool, dry warehouse. The package is sealed and stored to prevent breakage of the package. During transportation, it should be protected from rain, sunlight and moisture. More than the melting point of potassium fluoroborate decomposition of toxic boron trifluoride
Gas, in the atmosphere, potassium fluoroborate due to the action of water vapor and rapid hydrolysis, and produce white smoke, the skin, eyes, especially on the lungs have a stimulating effect. Protection Measure see boron trifluoride and fluoroboric acid.
Last Update：2025-06-10 22:55:16
POTASSIUM BOROFULUORIDE - Reference Information
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| introduction | potassium fluoroborate, alias potassium boride and potassium tetrafluoroborate, is the potassium salt of fluoroborate. Slightly soluble in water, solubility 4.4g/L (20 ℃), insoluble in cold ethanol and alkali solution, slightly soluble in hot ethanol. |
| properties | potassium fluoborate is a white powder or gel-like crystal. No hygroscopicity. It tastes bitter. |
| Use | Potassium fluoroborate is used as a flux flux, and is also used in the metallurgical industry and the preparation of boron trifluoride and other fluorine salt raw materials. Abrasive for thermosetting resin grinding wheels, raw materials for boron-containing alloys, flux for hot welding and brazing, and also used as low chromium anhydride chromium plating and lead-tin alloy electrolyte components used as analytical reagents and fluxes, it is also used in the manufacture of boron trifluoride, mold materials for aluminum and magnesium casting, electrochemical engineering and chemical testing as a flux for hot welding and brazing, as a raw material for aluminum-magnesium casting to produce boron-containing alloys, and as a filler in heavy-duty grinding wheels with resin as an abrasive binder. When welding and fusing silver, gold and stainless steel, it can clean the waste of light metal. It is the raw material for making boron trifluoride and other fluorine salts. Also used in electrochemical processes and reagents. It is used as a flux flux, and also used in the metallurgical industry and the preparation of boron trifluoride and other fluorine salt raw materials. It is used as a flux on welding and a raw material for the manufacture of other fluorine salts. It can also be used in electrochemical processes and reagents. Resin finishing agent for textile printing and dyeing, metal particle size improvement agent and refining flux for non-ferrous metals, aluminum and magnesium alloy casting sand agent flux. Abrasive for casting aluminum or magnesium. Electrochemical Engineering and Chemical Research, Flux. |
| toxicity | potassium fluoroborate decomposes toxic boron trifluoride gas if it exceeds the melting point. in the atmosphere, potassium fluoroborate is rapidly hydrolyzed due to the action of water vapor and produces white smoke, which is irritating to the skin, eyes and especially to the lungs. Refer to boron trifluoride and fluoroboric acid for protective measures. |
| production method | potassium hydrofluoroborate method puts hydrofluoric acid and boric acid into a reaction kettle with a feeding ratio of 25:6.2 (weight ratio), a temperature not exceeding 40 ℃, and a reaction for 6h. The prepared fluoroboric acid is sent to a neutralization tank, and under stirring and cooling, it is neutralized with potassium hydroxide with a concentration of 5 mol/L (until methyl orange is discolored). The precipitated potassium fluoroborate crystals are centrifuged, washed, and dried to produce potassium fluoroborate products. Its 4HF H3BO3 → HBF4 3H2OHBF4 KOH → KBF4 H2O potassium fluoroborate acid neutralization method neutralizes fluoroborate acid with saturated potassium carbonate solution under stirring in a plastic coated container until methyl orange changes color. The precipitated potassium fluoborate is centrifuged, washed, and dried to produce a finished product of potassium fluoborate. Its 2HBF4 K2CO3 → 2KBF4 H2O CO2 ↑ |
Last Update：2024-04-10 22:29:15
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Raw Materials for POTASSIUM BOROFULUORIDE