# NIOSH Pocket Guide to Chemical Hazards
Difluorodibromomethane | CAS 75-61-6
CBr2F2 | RTECS PA7525000
Synonyms & Trade Names Dibromodifluoromethane, Freon® 12B2, Halon® 1202 | DOT ID & Guide 1941 171
Exposure Limits | NIOSH REL: TWA 100 ppm (860 mg/m3)
OSHA PEL: TWA 100 ppm (860 mg/m3)
IDLH 2000 ppm | Conversion 1 ppm = 8.58 mg/m3
Physical Description Colorless, heavy liquid or gas (above 76°F) with a characteristic odor.
MW: 209.8 | BP: 76°F | FRZ: -231°F | Sol: Insoluble
VP: 620 mmHg | IP: 11.07 eV |  | Sp.Gr(59°F): 2.29
Fl.P: NA | UEL: NA | LEL: NA |
Noncombustible Liquid Nonflammable Gas
Incompatibilities & Reactivities Chemically-active metals such as sodium, potassium, calcium, powdered aluminum, zinc & magnesium
Measurement Methods NIOSH 1012; OSHA 7
Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: No recommendation Remove: When wet or contaminated Change: No recommendation | First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush immediately Breathing: Respiratory support Swallow: Medical attention immediately
Respirator Recommendations NIOSH/OSHA Up to 1000 ppm: (APF = 10) Any supplied-air respirator Up to 2000 ppm: (APF = 25) Any supplied-air respirator 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 organic vapor canister/Any appropriate escape-type, self-contained breathing apparatus
Exposure Routes inhalation, ingestion, skin and/or eye contact
Symptoms In animals: irritation respiratory system; central nervous system symptoms; liver damage
Target Organs respiratory system, central nervous system, liver
See also: INTRODUCTION