# 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
Exposure Limits | 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 | UEL: NA | LEL: 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
See also: INTRODUCTION