HFHydrogen Fluoride


STEL: 3ppm (Short Term exposure Limit - 15mins)

TWA: 1.8ppm (Time Weighted Average - 8hrs)


Alarm Recomendations
Rising Latching Alarms For Line Safety Applications

First Alarm: Second Alarm: Third Alarm:
1ppm 3ppm Optional

hydrogen fluoride, hydrogen fluoride gas, hf, hf gas, hf gas detection, Hydrogen Fluoride gas detectorHydrogen Fluoride(HF) is a colourless gas, with a pungent odour at 0.04ppm and causes eye irritation and throat irritation at 3 ppm. Hydrogen Fluoride gas is lighter than air and will be a liquid at temperatures below 20°C.

Hydrogen Fluoride (HF) Uses:

Hydrogen Fluoride is main gas source used in fluorine. This makes Hydrogen Fluoride the precursor to many pharmaceutical and industrial compounds and polymers, especially Teflon. It  is universally used in many superacids, such as Fluoroantimonic acid. Other uses for Hydrogen Fluoride include;

  • separating uranium isotopes
  • as a cracking catalyst in oil refineries
  • etching glass and enamel
  • removing rust
  • cleaning brass and crystal
  • It also is used in manufacturing silicon semiconductor chips and as a laboratory reagent.

Health Effects and Hazards

If Hydrogen Fluoride gas is inhaled, not only from the gas but also from the vapours arising from concentrated Hydrogen Fluoride liquid, even in fairly low concentrations can cause:

  • eye, irritation
  • nose irritation
  • throat irritation.
  • Strong irritating odour can be smelled at concentrations of 0.04ppm. this level is considerably less than the short term exposure limit of 3 ppm.
  • Systemic effects can occur from all routes of exposure and may include nausea, vomiting, gastric pain, or cardiac arrhythmia.
  • See the HSE EH40 Safety Sheet

Hydrogen fluoride can enter the body either by inhalation of air containing hydrogen fluoride or by dermal contact with hydrofluoric acid (dissolved form of HF). Dermal contact with hydrofluoric acid occurs mainly in the occupational setting. Inhalation of air containing hydrogen fluoride can cause irritation of the eyes, nose and throat.

Exposure to high levels may cause muscle spasms and can damage the lungs and heart and in extreme cases can result in death. Hydrofluoric acid is highly corrosive which means, physical contact(contact with skin or eyes) with hydrofluoric acid can cause severe skin burns. The skin may initially be red and painful while severe burns and internal tissue damage can develop over time following exposure. Absorption of large quantities of hydrofluoric acid through the skin can affect the heart and lungs and in extreme cases may result in death. Symptoms may be delayed for several days, especially in the case of exposure to dilute solutions of hydrogen fluoride (less than 20%).  Survivors of severe inhalation injury may suffer residual chronic lung disease.

IGD Hydrogen Fluoride Gas Detector Solutions:

IGD’s HF sensor is available as an 2-Wire ATEX/IECEX hydrogen fluoride Gas Detector for for hazardous areas. Alternatively IGD’s 2-Wire HF  gas detector for non hazardous areas.

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