NIOSH Pocket Guide to Chemical Hazards

Selenium hexafluoride CAS 7783-79-1
SeF6 RTECS VS9450000
Synonyms & Trade Names
Selenium fluoride
DOT ID & Guide
2194 125
NIOSH REL: TWA 0.05 ppm
OSHA PEL: TWA 0.05 ppm (0.4 mg/m3)
IDLH 2 ppm Conversion 1 ppm = 7.89 mg/m3
Physical Description
Colorless gas.
MW: 193.0
BP: -30°F
FRZ: -59°F
Sol: Insoluble
VP: >1 atm
IP: ?
RGasD: 6.66

Fl.P: NA

Nonflammable Gas
Incompatibilities & Reactivities
Water [Note: Hydrolyzes very slowly in cold water.]
Measurement Methods
None available
Personal Protection & Sanitation
Skin: No recommendation
Eyes: No recommendation
Wash skin: No recommendation
Remove: No recommendation
Change: No recommendation

First Aid (See procedures)

Breathing: Respiratory support

Respirator Recommendations NIOSH/OSHA
Up to 0.5 ppm: (APF = 10) Any supplied-air respirator
Up to 1.25 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode
Up to 2 ppm: (APF = 50) Any supplied-air respirator that has a tight-fitting facepiece and is operated in a continuous-flow mode/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator 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
Exposure Routes inhalation
Symptoms In animals: pulmonary irritation, edema
Target Organs respiratory system