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Home > Departments > Environment, Health & Safety > EH&S Programs > Laboratory Safety > HF HFHydrofluoric acid (CAS 7664-39-3) is a colorless, fuming liquid or gas with strong, irritating odor. It is considered more hazardous than most chemicals in five out of six ranking systems ; and it is ranked as one of the most hazardous compounds (worst 10%) to human health. Concentrated HF covering 2% of the body can be fatal. |