Skip directly to local search Skip directly to A to Z list Skip directly to navigation Skip directly to site content Skip directly to page options
CDC Home

Enter search terms separated by spaces.

Hydrogen fluoride

Synonyms & Trade Names
Anhydrous hydrogen fluoride; Aqueous hydrogen fluoride (i.e., Hydrofluoric acid); HF-A
CAS No.
7664-39-3
RTECS No.
MW7875000
DOT ID & Guide
1052 125 (anhydrous)
1790 157 (solution)
Formula
HF
Conversion
1 ppm = 0.82 mg/m3
IDLH
30 ppm
See: 7664393
Exposure Limits
NIOSH REL
: TWA 3 ppm (2.5 mg/m3) C 6 ppm (5 mg/m3) [15-minute]
OSHA PEL
†: TWA 3 ppm
Measurement Methods

NIOSH 3800 , 7902 , 7903 , 7906;
OSHA ID110
See: NMAM or OSHA Methods
Physical Description
Colorless gas or fuming liquid (below 67°F) with a strong, irritating odor. [Note: Shipped in cylinders.]
MW:
20.0
BP:
67°F
FRZ:
-118°F
Sol:
Miscible
VP:
783 mmHg
IP:
15.98 eV
Sp.Gr:
1.00 (Liquid at 67°F)
Fl.P:
NA
UEL:
NA
LEL:
NA
RGasD:
0.69
Nonflammable Gas
Incompatibilities & Reactivities
Metals, water or steam [Note: Corrosive to metals. Will attack glass and concrete.]
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
Target Organs
Eyes, skin, respiratory system, bones
Personal Protection/Sanitation
(See protection codes)
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)
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

Important additional information about respirator selection

See also: INTRODUCTION   See ICSC CARD: 0283   See MEDICAL TESTS: 0118
 

Order NIOSH Publications

Contact Us:
USA.gov: The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Rd. Atlanta, GA 30333, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348 - Contact CDC–INFO