NIOSH Pocket Guide to Chemical Hazards


CAS 75-71-8


RTECS PA8200000
Synonyms & Trade Names
Difluorodichloromethane; Fluorocarbon 12; Freon® 12; Genetron® 12; Halon® 122; Propellant 12; Refrigerant 12
DOT ID & Guide
1028 126


NIOSH REL: TWA 1000 ppm (4950 mg/m3)
OSHA PEL: TWA 1000 ppm (4950 mg/m3)
IDLH 15,000 ppm See: 75718 Conversion 1 ppm = 4.95 mg/m3
Physical Description
Colorless gas with an ether-like odor at extremely high concentrations. [Note: Shipped as a liquefied compressed gas.]
MW: 120.9
BP: -22°F
FRZ: -252°F
Sol(77°F): 0.03%
VP: 5.7 atm
IP: 11.75 eV
RGasD: 4.2

Fl.P: NA

Nonflammable Gas
Incompatibilities & Reactivities
Chemically-active metals such as sodium, potassium, calcium, powdered aluminum, zinc & magnesium
Measurement Methods
NIOSH 1018
See: NMAM or OSHA Methods
Personal Protection & Sanitation (See protection)
Skin: Frostbite
Eyes: Frostbite
Wash skin: No recommendation
Remove: No recommendation
Change: No recommendation
Provide: Frostbite wash
First Aid (See procedures)
Eye: Frostbite
Skin: Frostbite
Breathing: Respiratory support

Important additional information about respirator selection
Respirator Recommendations NIOSH/OSHA
Up to 10,000 ppm:
(APF = 10) Any supplied-air respirator
Up to 15,000 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
(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, skin and/or eye contact (liquid)
Symptoms Dizziness, tremor, asphyxia, unconsciousness, cardiac arrhythmias, cardiac arrest; liquid: frostbite
Target Organs cardiovascular system, peripheral nervous system
See also: INTRODUCTION   See ICSC CARD: 0048