Ammonium Bifluoride purified

Ammonium bifluoride purified is a highly water-soluble, white crystalline inorganic salt with the formula NH₄HF₂, used widely in industrial applications for its etching, cleaning, and metal treatment properties.​

Chemical and Physical Properties

Formula: NH₄HF₂ (ammonium hydrogen difluoride).​

Molar mass: 57.04 g/mol.​

Appearance: White crystalline solid, often hygroscopic (absorbs moisture from air).​

Melting point: 124.6 °C; boils/decomposes ~240 °C.​

Density: 1.5 g/cm³.​

Solubility in water: Very high (60–156 g/100 mL, depending on temperature).​

pH (5% solution): around 3.5 (acidic).​

Purity (purified/extra pure): typically ≥98%.​

Major Uses and Applications

Glass etching and frosting: Ammonium bifluoride is a powerful etchant for glass and silicates, used in glass, lamp, and optical industries.​

Metal treatment and cleaning: Removes oxides, scales, and stains from metal surfaces, and is a cleaning agent for steel, aluminum, and equipment.​

Surface polishing: Plays a role in precision cleaning of ceramics and metal parts.​

Chemical intermediate: Used in the production of hydrofluoric acid and as a source of fluoride ions for industrial synthesis.​

Textiles and dyes: Acts as a mordant and dyeing auxiliary.​

Safety and Handling

Highly corrosive and toxic; causes severe skin burns and eye damage.​

Releases corrosive hydrogen fluoride vapors when moist or heated—must be handled only with proper protective equipment in well-ventilated conditions.​

Hygroscopic: Store in airtight containers, away from acids and moisture.​

Non-flammable, but reacts with metals and glass.​

Ammonium bifluoride purified is valued for its versatility in industrial etching, cleaning, and processing, but demands careful handling due to its corrosivity and toxicity