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Dichlorodifluoromethane

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Synonyms & Trade Names
Difluorodichloromethane, Fluorocarbon 12, Freon® 12, Genetron® 12, Halon® 122, Propellant 12, Refrigerant 12
CAS No.
75-71-8
RTECS No.
PA8200000
DOT ID & Guide
1028 126
Formula
CCl₂F₂
Conversion
1 ppm = 4.95 mg/m3
IDLH
15,000 ppm
See: 75718
Exposure Limits
NIOSH REL
TWA 1000 ppm (4950 mg/m3)
OSHA PEL
TWA 1000 ppm (4950 mg/m3)
Measurement Methods
NIOSH 1018
See: NMAM or OSHA Methods
Physical Description
Colorless gas with an ether-like odor at extremely high concentrations. [Note: Shipped as a liquefied compressed gas.]
Molecular Weight
120.9
Boiling Point
-22°F
Freezing Point
-252°F
Solubility
(77°F): 0.03%
Vapor Pressure
5.7 atm
Ionization Potential
11.75 eV
Flash Point
NA
Upper Explosive Limit
NA
Lower Explosive Limit
NA
Relative Gas Density
4.2
Nonflammable Gas
Incompatibilities & Reactivities
Chemically-active metals such as sodium, potassium, calcium, powdered aluminum, zinc & magnesium
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
Personal Protection/Sanitation
(See protection codes)
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
Respirator Recommendations

NIOSH/OSHA

Up to 10000 ppm:
(APF = 10) Any supplied-air respirator

Up to 15000 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

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 0048
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health