Hydrofluoric acid or Hydrogen Fluoride (HF) is fatal if inhaled, if swallowed, or in contact with skin. It causes severe skin burns and eye damage. The effects may be delayed after exposure. Do not ...

Although chemists consider hydrofluoric acid (HF) to be a “weak” acid ... HF burns cause excruciating pain and are very slow to heal. Skin contact with HF is probably the most common route of exposure ...