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Ammonium Bifluoride CAS 1341-49-7 cidammoniumfluoride 

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Place of Origin: Shandong, China (Mainland) 
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Product Detail

Means of Transport: Ocean,Land,Air
Packing: According to the request of...
Brand Name: MOSINTER
Molecular formula: F2H5N
Melting Point: 125 °C(lit.)
Flashing point: 238°C
Soluble: 630 g/L (20 ºC)
Production Capacity: 5000 Ton/Year
Delivery Date: within 7 days
CAS No.: 1341-49-7
Molecular weight: 57.04
Boiling point: 230 °C
Density: 1,5 g/cm3
Sensibility: Hygroscopic

Ammonium hydrogen fluoride is the inorganic compound with the formula NH4HF2 or NH4For HF.

Ammonium Bifluoride (CAS: 1341-49-7)





White Orthorhombic Crystal

NH4HF2, %≥


loss on drying, %≤


Content of residue on ignition, %≤


Sulfate(base on SO4) content, %≤


Content of ammonium fluosilicate [(NH4)SiF6]   , %≤


Ammonium hydrogen fluoride is the inorganic compound with the formula NH4HF2 or NH4F·HF. It is produced from ammonia and hydrogen fluoride. This colourless salt is a glass-etchant and an intermediate in a once-contemplated route to hydrofluoric acid.


Ammonium bifluoride, as its name indicates, contains a bifluoride, or hydrogen(difluoride) anion: HF2−. This centrosymmetric triatomic anion features the strongest known hydrogen bond, with a F−H length of 114 pm.  and a bond energy greater than 155 kJ mol−1.

In solid [NH4][HF2], each ammonium cation is surrounded by four fluoride centers in a tetrahedron, with hydrogen-fluorine hydrogen bonds present between the hydrogen atoms of the ammonium ion and the fluorine atoms. Solutions contain tetrahedral [NH4]+ cations and linear [HF2]− anions.

Production and applications

Ammonium bifluoride is a component of some etchants. It attacks silica component of glass:

SiO2 + 4 [NH4][HF2] → SiF4 + 4 [NH4]F + 2 H2O

Potassium bifluoride is a related more commonly used etchant.

Ammonium bifluoride has been considered as an intermediate in the production of hydrofluoric acid from hexafluorosilicic acid. Thus, hexafluorosilicic acid is hydrolyzed to give ammonium fluoride, which thermally decomposes to give the bifluoride:

H2SiF6 + 6 NH3 + 2 H2O → SiO2 + 6 NH4F

2 NH4F → NH3 + [NH4]HF2

The resulting ammonium bifluoride is converted to the sodium bifluoride, which thermally decomposes to release HF.

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