Ammonium hydrogen difluoride

• CAT Number: M049656
• CAS Number: 1341-49-7
• Molecular Formula: F2H5N
• Molecular Weight: 57.04
• Purity: ≥95%
• Storage: -20°C
• IUPAC Name: azanium;fluoride;hydrofluoride
• InChI: InChI=1S/2FH.H3N/h2*1H;1H3
• InChIKey: KVBCYCWRDBDGBG-UHFFFAOYSA-N
• SMILES: [NH4+].F.[F-]

Ammonium hydrogen difluoride (Cat No.: M049656) is a colorless, crystalline salt composed of ammonium (NH₄⁺) and hydrogen difluoride (HF₂⁻) ions. It is a strongly acidic and corrosive compound, commonly used in glass etching, metal surface treatment, and semiconductor cleaning due to its ability to dissolve silica and oxides. Upon decomposition, it releases hydrofluoric acid (HF), requiring careful handling. Ammonium hydrogen difluoride also serves as a fluorinating agent in chemical synthesis and is important in industrial processes involving fluoride chemistry.