NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Oxygen difluoride

CAS
7783-41-7

OF2

RTECS
RS2100000
Synonyms & Trade Names

Difluorine monoxide, Fluorine monoxide, Oxygen fluoride
DOT ID & Guide
2190 / 124

Exposure
Limits

NIOSH REL: C 0.05 ppm (0.1 mg/m3)
OSHA PEL: TWA 0.05 ppm (0.1 mg/m3)
IDLH
0.5 ppm See: 7783417
Conversion
1 ppm = 2.21 mg/m3
Physical Description
Colorless gas with a peculiar, foul odor. [Note: Shipped as a nonliquefied compressed gas.]
MW: 54.0
BP: -230°F
FRZ: -371°F
Sol: 0.02%
VP: >1 atm
IP: 13.11 eV
RGasD: 1.88

Fl.P: NA
UEL: NA
LEL: NA

Nonflammable Gas, but a strong oxidizer.
Incompatibilities & Reactivities

Combustible materials, chlorine, bromine, iodine, platinum, metal oxides, moist air, hydrogen sulfide, hydrocarbons, water [Note: Reacts very slowly with water to form hydrofluoric acid.]
Measurement Methods
None available
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
Skin: No recommendation
Eyes: No recommendation
Wash skin: No recommendation
Remove: No recommendation
Change: No recommendation

First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support

Respirator Recommendations
NIOSH/OSHA
Up to 0.5 ppm:
(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 and/or eye contact
Symptoms
Irritation eyes, skin, respiratory system; headache; pulmonary edema; eye, skin burns (from contact with the gas under pressure)
Target Organs
Eyes, skin, respiratory system
See also: INTRODUCTION   See ICSC CARD: 0818   See MEDICAL TESTS: 0171