| Identification | More | [Name]
Potassium tetrafluoroborate | [CAS]
14075-53-7 | [Synonyms]
POTASSIUM BOROFLUORIDE
POTASSIUM BOROFULUORIDE
POTASSIUM FLUOBORATE
POTASSIUM FLUOROBORATE
POTASSIUM TETRAFLUOROBORATE
Avogadrite
Borate(1-), tetrafluoro-, potassium
Borate(1-),tetrafluoro-,potassium
boronpotassiumfluoride
KBF4
Potassium borofluoride (KBF4)
Potassium boron fluoride
Potassium fluoroborate (KBF4)
Potassium fluorohydroborate
Potassium hydrofluoroborate
potassiumboridefluoride
potassiumtetrafluoroborate(1-)
tetrafluoro-borate(1-potassium
Potassium Hexafluoroposphate
POTASSIUM TETRAFLUOROBORATE, 99.99+% | [EINECS(EC#)]
237-928-2 | [Molecular Formula]
BF4K | [MDL Number]
MFCD00011395 | [Molecular Weight]
125.9 | [MOL File]
14075-53-7.mol |
| Chemical Properties | Back Directory | [Appearance]
white odourlesss crystalline powder | [Melting point ]
530 °C(lit.) | [density ]
2.505 g/mL at 25 °C(lit.)
| [refractive index ]
1.3245 | [storage temp. ]
Sealed in dry,Room Temperature | [solubility ]
slightly soluble in ethanol | [form ]
Micro-Crystalline Powder | [color ]
White to light gray | [Odor]
wh. odorless cryst. | [Stability:]
Stable. May decompose on exposure to water or moisture. Incompatible with metals. | [Water Solubility ]
4.4 g/L (20 ºC) | [Sensitive ]
Moisture Sensitive | [Merck ]
14,7686 | [Exposure limits]
ACGIH: TWA 2.5 mg/m3
NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3 | [CAS DataBase Reference]
14075-53-7(CAS DataBase Reference) | [NIST Chemistry Reference]
Potassium tetrafluoroborate(14075-53-7) | [EPA Substance Registry System]
14075-53-7(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
Xi,C | [Risk Statements ]
R36/37/38:Irritating to eyes, respiratory system and skin .
R34:Causes burns. | [Safety Statements ]
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 label where possible) .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection . | [RIDADR ]
3260 | [WGK Germany ]
1
| [RTECS ]
ED2800000
| [Hazard Note ]
Corrosive/Moisture Sensitive | [TSCA ]
Yes | [HS Code ]
28269090 | [Safety Profile]
Poison by
intraperitoneal route. When heated to
decomposition it emits very toxic fumes of
F, K2O, and BOx. Used in sand casting of
aluminum and magnesium, grinding, and in
resinoid grindmg wheels. See also
FLUORIDES and BORON
COMPOUNDS. |
| Hazard Information | Back Directory | [Hazard]
Toxic by ingestion.
| [Uses]
Has been proposed as a flux for soldering and brazing; filler in resin-bonded grinding wheels. | [Uses]
Potassium tetrafluoroborate is used as an active filler in the preparation of resin-bonded abrasives. It is also used for extraction, refining and processing of metals in the chemical industry. It finds application as additive in alloying industry and welding agent. Further, it is used in the production of fluxing agents for brazing and soldering. | [Flammability and Explosibility]
Notclassified | [Purification Methods]
Crystallise it from H2O (solubility% (temperature): 0.3 (3o), 0.45 (20o), 1.4 (40o), 6.27 (100o), and dry it under vacuum. It is a non-hygroscopic salt. A 10% solution is transparent blue at 100o, green at 90o and yellow at 60o. [V.rlander et al. Chem Ber 65 535 1932, Kwasnik in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 223 1963.] |
| Questions And Answer | Back Directory | [Chemical Properties]
It appears as white powder or gelatinous crystals. It has hygroscopicity with bitter taste. It is slightly soluble in water and hot ethanol, insoluble in cold ethanol.
| [Application]
- Used as the abrasive material of the thermosetting resin grinding wheel, the raw material of boron alloy, the fluxing agent of heat welding and brazing; it can also be used as the components of low chromic anhydride chrome and lead-tin alloy electrolyte.
- Used as analytical reagents and fluxes, also for the production of boron trifluoride, abrasive materials for the aluminum and magnesium casting, electrochemical engineering and chemical testing.
- Used as the fluxing agent of heat flux and brazing, and the raw material for the production of boron alloy using aluminum and magnesium casting; it acts as the filler in the heavy wheel using resin as abrasive adhesive. In the welding and fusion of silver, gold, stainless steel, it can clean up the dross of light metal. It is a raw material for the manufacture of boron trifluoride and other fluorine salts. Also used in electrochemical processes and reagents.
- Used as fluxing agent; also used for the metallurgical industry and for the preparation of boron trifluoride as well as the raw materials of other fluorine salt.
- Used as the resin finishing agents for textile printing and dyeing, improving agent of metal particle size and refining fluxes and the casting sand granules of the aluminum and magnesium alloy.
| [Preparative Methods]
Fluoroboric acid-potassium hydroxide method:
Hydrofluoric acid and boric acid are sent into the reactor at a ratio of 25: 6.2 (weight ratio); the temperature does not exceed 40 ℃. The reaction continues for 6h. The prepared fluoroboric acid is fed to a neutralization tank and neutralized with a 5 mol/L potassium hydroxide under stirring and cooling (until the methyl orange is discolored). Precipitated potassium fluoroborate crystal is subject to centrifugal separation, washing and drying, obtaining the finished product of potassium fluoroborate. its
4HF + H3BO3 → HBF4 + 3H2O
HBF4 + KOH → KBF4 + H2O
Fluoroboric acid/potassium carbonate neutralization method: under the stirring of the coating container, apply the saturated potassium carbonate solution for neutralizing fluoroboric acid to until the methyl orange is discolored. The precipitated potassium fluoroborate is subject to centrifugal separation, washing and drying, obtaining the finished product of potassium fluoroborate. Its reaction is:
2HBF4 + K2CO3 → 2KBF4 + H2O + CO2 ↑
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