| Agent Name |
Hydrogen fluoride |
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| Alternative Name |
Hydrofluoric acid |
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| CAS Number |
7664-39-3 |
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| Formula |
F-H |
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| Major Category |
Toxic Gases & Vapors |
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| Synonyms |
Anhydrous hydrogen fluoride; Aqueous hydrogen fluoride; Hydrofluoric acid; HF-A; [NIOSH] Rubigine; Hydrofluoride; Fluorhydric acid; Antisal 2B; [ChemIDplus] UN1052 |
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| Category |
Acids |
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| Description |
Colorless gas or fuming liquid (below 67 degrees F) with a strong, irritating odor; Note: Shipped in cylinders; [NIOSH] |
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| Sources/Uses |
Used as a catalyst and fluorinating agent; used to etch glass, pickle stainless steel, and control pH in oil well operations; [ACGIH] |
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| Comments |
Aqueous hydrogen fluoride = hydrofluoric acid; [NIOSH] Industrial solutions of 45% and 53% are sold commercially. [ACGIH] Over-the-counter solutions usually contain 6-12%. Adverse effects caused by different concentrations of solutions include immediate burns after contact with 50% and greater, delayed pain and swelling up to 8 hours after contact with 20-50%, and injury delayed by 12-24 hours after contact with 20% or less. [ATSDR Medical Management] Solutions 30-70% are highly corrosive to skin; [Quick CPC] Listed as one of the "major irritant airborne toxicants"; [LaDou, p. 523] The following chemicals can release HF when spilled in water: Fluorosulfonic acid, Antimony pentafluoride, Iodine pentafluoride, Uranium hexafluoride, Bromine trifluoride, and Bromine pentafluoride. [ERG 2008] See the Process, "Toxic Gas from Spilling Chemical in Water." See the Disease, "Hydrofluoric acid, toxic effect." Hydrogen fluoride is fibrogenic to the lungs in the context of an acute inhalation exposure complicated by bronchiolitis obliterans. |
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| Reference Link |
ATSDR Medical Management - Hydrogen fluoride |
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| Exposure Assessment |
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| Skin Designation (ACGIH) |
Yes |
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| TIH |
Yes |
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| TLV (ACGIH) |
0.5 ppm, as F |
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| Ceiling (ACGIH) |
2 ppm, as F |
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| PEL (OSHA) |
3 ppm |
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| MAK |
1 ppm |
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| IDLH (NIOSH) |
30 ppm, as F |
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| Excerpts from Documentation for IDLHs |
It has been stated that 50 ppm may be fatal when inhaled for 30 to 60 minutes [Deichmann and Gerarde 1969]. Volunteers tolerated concentrations as high as 4.7 ppm for 6 hours per day for 10 to 50 days without severe adverse effects [Largent 1961] |
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| Vapor Pressure |
783 mm Hg |
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| Odor Threshold Low |
0.04 ppm |
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| Lethal Concentration |
LC50 (rats) = 1,276 ppm/1 hr |
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| Explanatory Notes |
Odor threshold from AIHA; The Guide from the Emergency Response Guidebook is for " Hydrogen fluoride, anhydrous." The 10-minute ERPGs for HF are: 1: 2 ppm; 2: 50 ppm; and 3: 170 ppm; [AIHA] |
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| Reference Link |
International Chemical Safety Cards (WHO/IPCS/ILO) |
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| Flammability (NFPA) |
0: will not burn |
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| Adverse Effects |
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| Toxic Pneumonitis |
Yes |
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| Fibrogenic |
Yes |
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| Dermatotoxin |
Skin Burns |
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| Links to Other NLM Databases |
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| Health Studies |
Human Health Effects from Hazardous Substances Data Bank: HYDROFLUORIC ACID
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