NIOSH Pocket Guide to Chemical Hazards


CAS 76-11-9


RTECS KI1425000
Synonyms & Trade Names
2,2-Difluoro-1,1,1,2-tetrachloroethane; Freon® 112a; Halocarbon 112a; Refrigerant 112a
DOT ID & Guide


NIOSH REL: TWA 500 ppm (4170 mg/m3)
OSHA PEL: TWA 500 ppm (4170 mg/m3)
IDLH 2000 ppm See: 76119 Conversion 1 ppm = 8.34 mg/m3
Physical Description
Colorless solid with a slight, ether-like odor. [Note: A liquid above 105°F.]
MW: 203.8
BP: 197°F
MLT: 105°F
Sol: 0.01%
VP: 40 mmHg
IP: ?

Sp.Gr: 1.65
Fl.P: NA

Noncombustible Solid
Incompatibilities & Reactivities
Chemically-active metals such as potassium, beryllium, powdered aluminum, zinc, calcium, magnesium & sodium; acids
Measurement Methods
NIOSH 1016; OSHA 7
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: No recommendation

First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
Important additional information about respirator selection
Respirator Recommendations NIOSH/OSHA
Up to 2000 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
(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 Irritation eyes, skin; central nervous system depression; pulmonary edema; drowsiness; dyspnea (breathing difficulty)
Target Organs Eyes, skin, respiratory system, central nervous system