Hydrogen fluoride (chemical formula: HF) is a fluoride of hydrogen, which is strongly corrosive and highly toxic. It is a colorless gas, and in the air, as long as it exceeds 3ppm, it will produce a irritating taste. Hydrofluoric acid is an aqueous solution of hydrogen fluoride, which can be absorbed through the skin mucosa, respiratory tract and gastrointestinal tract. If accidentally exposed to hydrofluoric acid, wash immediately with plenty of water for 20 to 30 minutes, then apply with calcium gluconate ointment or liquid medicine, and emergency medical treatment; If you drink it by mistake, drink a large amount of high-calcium milk immediately, and then send it to the doctor for emergency treatment.

Appearance and properties: Colorless gas with a spicy smell

Density: 1.15g /mL at 25 °C(lit.)

Boiling point: 105°C

Melting point: -35°C

Flash point: 112°C

Water solubility: soluble

Stability: Stable. Hygroscopic. Incompatible with glass, alkali metals, light metals, alkaline earth metals

Storage conditions: The warehouse is ventilated and dry at low temperature, and stored separately from H pore agent, alkali, cyanide and metal powder

Vapor density: 1.27 (vs air)

Vapor pressure: 25 mm Hg (20 °C)