NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Hydrogen fluoride

CAS
7664-39-3

HF

RTECS
MW7875000
Synonyms & Trade Names

Anhydrous hydrogen fluoride; Aqueous hydrogen fluoride (i.e., Hydrofluoric acid); HF-A
DOT ID & Guide
1052 / 125 (anhydrous)
1790 / 157 (solution)

Exposure
Limits

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
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
RGasD: 1.86
Sp.Gr: 1.00 (Liquid at 67°F)
Fl.P: NA
UEL: NA
LEL: NA

Nonflammable Gas
Incompatibilities & Reactivities

Metals, water or steam [Note: Corrosive to metals. Will attack glass and concrete.]
Measurement Methods
NIOSH 3800, 7902, 7903, 7906; OSHA ID110
See: NMAM or OSHA Methods
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)
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
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
See also: INTRODUCTION   See ICSC CARD: 0283   See MEDICAL TESTS: 0118