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          The National Institute for Occupational Safety and Health (NIOSH)
         1. NIOSH Pocket Guide to Chemical Hazards
      Dichloromonofluoromethane
      Print
        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
                Formula
                  CHCl₂F
                Conversion
                  1 ppm = 4.21 mg/m3
                IDLH
                  5000 ppm
                  See: 75434
                Exposure Limits
                  NIOSH REL
                  TWA 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 Weight
                  102.9
                Boiling Point
                  48°F
                Freezing Point
                  -211°F
                Solubility
                  (86°F): 0.7%
                Vapor Pressure
                  (70°F): 1.6 atm
                Ionization Potential
                  12.39 eV
                Flash Point
                  NA
                Upper Explosive Limit
                  NA
                Lower Explosive Limit
                  NA
                Relative Gas Density
                  3.57
                  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 canister
                Any 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
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