Hydrofluoric acid, a solution of hydrogen fluoride gas (HF) in water, is one of the most corrosive and dangerous chemicals encountered in the laboratory. Exposure to HF can cause severe tissue damage and even death. The fluoride ions in HF readily bind calcium and magnesium, reducing their levels in the blood, resulting in hypotension and cardiac effects.1 Deaths have been reported from concentrated acid burns (involving ≥ 50% HF solutions) to as little as 2.5% of body surface area, which is equivalent to approximately one hand and forearm.2 In lower concentrations, symptoms may be delayed, which can lead to delayed recognition of exposure and a more severe burn. The following special safety precautions are necessary when using this chemical, regardless if using dilute or concentrated HF.

Hydrofluoric acid (HF) exposure is very toxic and can be fatal if not treated immediately. HF is absorbed quickly; however, damage/symptoms can occur hours to days later. Any person exposed to HF must have immediate first aid, followed by immediate medical treatment from a physician. When seeking medical attention bring a copy of this HF Fact Sheet, the Safety Data Sheet (SDS) for the product used, and the Honeywell guide, “Recommended Medical Treatment for Hydrofluoric Acid Exposure” to the Stanford Hospital Emergency Room.

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Or, take victim to seek medical evaluation at Stanford Hospital Emergency Room. If possible, provide continuous irrigation during transport.

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Immediately call EH&S at (650) 725-9999 (286 from School of Medicine phones) to report an HF spill that is health threatening, is outside of the fume hood, is greater than 30 mls, or will take longer than 15 minutes to clean up. Do not use spill kits with kitty litter or sand because HF reacts with silica to produce silicon tetrafluoride, a toxic gas.

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