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Hydrogen fluoride |
CAS 7664-39-3 | ||
HF |
RTECS MW7875000 | ||
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Synonyms & Trade Names Anhydrous hydrogen fluoride; Aqueous hydrogen fluoride (i.e., Hydrofluoric acid); HF-A |
DOT ID & Guide 1052 125 (anhydrous) 1790 157 (solution) |
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Exposure
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NIOSH REL: TWA 3 ppm (2.5 mg/m3) C 6 ppm (5 mg/m3) [15-minute] | ||
| OSHA PEL†: TWA 3 ppm | |||
| IDLH 30 ppm See: 7664393 | Conversion 1 ppm = 0.82 mg/m3 | ||
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Physical Description Colorless gas or fuming liquid (below 67°F) with a strong, irritating odor. [Note: Shipped in cylinders.] |
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MW: 20.0 |
BP: 67°F |
FRZ: -118°F |
Sol: Miscible |
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VP: 783 mmHg |
IP: 15.98 eV |
RGasD: 1.86 |
Sp.Gr: 1.00 (Liquid at 67°F) |
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Fl.P: NA |
UEL: NA |
LEL: NA |
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| Nonflammable Gas | |||
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Incompatibilities & Reactivities Metals, water or steam [Note: Corrosive to metals. Will attack glass and concrete.] |
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Measurement Methods NIOSH 3800, 7902, 7903, 7906; OSHA ID110 See: NMAM or OSHA Methods |
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Personal Protection & Sanitation (See protection) Skin: Prevent skin contact (liquid) Eyes: Prevent eye contact (liquid) Wash skin: When contaminated (liquid) Remove: When wet or contaminated (liquid) Change: No recommendation Provide: Eyewash (liquid), Quick drench (liquid) |
First Aid (See procedures) Eye: Irrigate immediately (solution/liquid) Skin: Water flush immediately (solution/liquid) Breathing: Respiratory support Swallow: Medical attention immediately (solution) |
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Important additional information about respirator selection Respirator Recommendations NIOSH/OSHA Up to 30 ppm: (APF = 10) Any chemical cartridge respirator with cartridge(s) providing protection against the compound of concern* (APF = 25) Any powered, air-purifying respirator with cartridge(s) providing protection against the compound of concern* (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern (APF = 10) Any supplied-air respirator* (APF = 50) Any self-contained breathing apparatus with a full facepiece Emergency or planned entry into unknown concentrations or IDLH conditions: (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode (APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus Escape: (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern/Any appropriate escape-type, self-contained breathing apparatus |
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| Exposure Routes inhalation, skin absorption (liquid), ingestion (solution), skin and/or eye contact | |
| Symptoms Irritation eyes, skin, nose, throat; pulmonary edema; eye, skin burns; rhinitis; bronchitis; bone changes | |
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Target Organs
Eyes, skin, respiratory system, bones |
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| See also: INTRODUCTION See ICSC CARD: 0283 See MEDICAL TESTS: 0118 |