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Dichloromonofluoromethane																				Related Pages
Synonyms & Trade Names
			Dichlorofluoromethane, Fluorodichloromethane, Freon® 21, Genetron® 21, Halon® 112, Refrigerant 21
CAS No.
			75-43-4
	RTECS No.
			PA8400000
	DOT ID & Guide
			1029 126

FormulaCHCl2F
	Conversion
			1 ppm = 4.21 mg/m3
	IDLH
			5000 ppmSee: 75434

Exposure Limits
			NIOSH RELTWA 10 ppm (40 mg/m3)
					OSHA PEL TWA 1000 ppm (4200 mg/m3) See Appendix G
	Measurement Methods
			**NIOSH** 2516
					
					See: NMAM or OSHA Methods
										
Physical Description
			Colorless gas with a slight, ether-like odor.
					[Note: A liquid below 48°F. Shipped as a liquefied compressed gas.]													
										
Molecular Weight102.9	
	Boiling Point48°F
	Freezing Point-211°F
	Solubility(86°F): 0.7%
	Vapor Pressure(70°F): 1.6 atm
	Ionization Potential12.39 eV											
Flash PointNA
	Upper Explosive LimitNA
	Lower Explosive LimitNA
	Relative Gas Density3.57
Nonflammable Gas
Incompatibilities & Reactivities
			Chemically-active metals such as sodium, potassium, calcium, powdered aluminum, zinc & magnesium; acid; acid fumes
Exposure Routes
			inhalation, skin and/or eye contact (liquid)
Symptoms
			asphyxia, cardiac arrhythmias, cardiac arrest; liquid: frostbite
Target Organs
			respiratory system, cardiovascular 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****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 canisterAny appropriate escape-type, self-contained breathing apparatus
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 1106

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
Introduction
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Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
Personal Protection and Sanitation Codes
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