Dichloromonofluoromethane
Synonyms & Trade Names
Dichlorofluoromethane, Fluorodichloromethane, Freon® 21, Genetron® 21, Halon® 112, Refrigerant 21Physical Description
Colorless gas with a slight, ether-like odor. [Note: A liquid below 48°F. Shipped as a liquefied compressed gas.]Molecular Weight
102.9Boiling Point
48°FFreezing Point
-211°FSolubility
(86°F): 0.7%Vapor Pressure
(70°F): 1.6 atmIonization Potential
12.39 eVFlash Point
NAUpper Exposive Limit
NALower Explosive Limit
NARelative Gas Density
3.57Incompatibilities & Reactivities
Chemically-active metals such as sodium, potassium, calcium, powdered aluminum, zinc & magnesium; acid; acid fumesExposure Routes
inhalation, skin and/or eye contact (liquid)Symptoms
asphyxia, cardiac arrhythmias, cardiac arrest; liquid: frostbiteTarget Organs
respiratory system, cardiovascular systemPersonal Protection/Sanitation
(See protection codes)Skin:Frostbite
Eyes:Frostbite
Wash skin:No recommendation
Remove:No recommendation
Change:No recommendation
Provide:Frostbite wash
Respirator Recommendations
NIOSH
Up to 100 ppm:
(APF = 10) Any supplied-air respirator
Up to 250 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode
Up to 500 ppm:
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece
Up to 5000 ppm:
(APF = 1000) Any supplied-air respirator operated in a pressure-demand or other positive-pressure mode
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
- Page last reviewed:April 11, 2016
- Page last updated:April 11, 2016
- Content source:
- National Institute for Occupational Safety and Health (NIOSH) Education and Information Division