Basic information Safety Related Supplier


Basic information Safety Related Supplier
Dichloromonofluoromethane Basic information
Dichloromonofluoromethane Chemical Properties
  • Melting point:-135°C
  • Boiling point:8.9°C
  • Density 1,354 g/cm3
  • vapor pressure 1,216 at 11.8 °C (NIOSH, 1997)
  • refractive index 1.3540
  • solubility Soluble in acetic acid, alcohol, and ether (Weast, 1986)
  • form Colorless gas
  • color Colorless liquid or gas with an ether-like odor
  • Water Solubility 0.7 wt % at 30 °C (NIOSH, 1997)
  • Exposure limitsNIOSH REL: TWA 10 ppm (40 mg/m3), IDLH 5,000 ppm; OSHA PEL: TWA 1,000 ppm (4,200 mg/m3); ACGIH TLV: TWA 10 ppm (adopted).
  • NIST Chemistry ReferenceMethane, dichlorofluoro-(75-43-4)
  • EPA Substance Registry SystemHCFC-21 (75-43-4)
Safety Information
  • Hazard Codes N
  • Risk Statements 59
  • Safety Statements 59
  • RIDADR 1029
  • RTECS PA8400000
  • HazardClass 2.2
  • Hazardous Substances Data75-43-4(Hazardous Substances Data)
  • ToxicityLC50 (inhalation) for rats 49,900 ppm/4-h (quoted, RTECS, 1985).
Dichloromonofluoromethane Usage And Synthesis
  • Chemical PropertiesDichlorofluoromethane is a heavy, colorless gas or liquid (below 9C) with a slight ethereal odor.
  • UsesFire extinguishers; solvent; refrigerant.
  • UsesRefrigerant gas; propellant gas
  • General DescriptionDichloromonofluoromethane is a colorless, odorless gas. Dichloromonofluoromethane is shipped as a liquid under its own vapor pressure. Contact with the liquid may cause frostbite to unprotected skin. Dichloromonofluoromethane can asphyxiate by displacement of air. Exposure of the container to prolonged heat or fire may cause Dichloromonofluoromethane to rupture violently and rocket.
  • Air & Water ReactionsSlightly soluble in water.
  • Reactivity ProfileDichloromonofluoromethane is incompatible with the following: Chemically-active metals such as sodium, potassium, calcium, powdered aluminum, zinc & magnesium; acid; acid fumes .
  • Health HazardINHALATION: May cause giddiness, light-headedness, disorientation, nausea, vomiting, narcosis, cardiac dysrhythmias, hypotension, and death. SKIN: May cause frostbite or irritation. EYES: May cause irritation or cold injury.
  • Fire HazardSpecial Hazards of Combustion Products: Toxic fumes of chlorine and fluorine may be produced in fire.
  • Safety ProfileMildly toxic by inhalation. Experimental reproductive effects. When heated to decomposition it emits very toxic fumes of Cl and F-.
  • Potential ExposureThis material is used as a refrigerant and a propellant gas.
  • Environmental FateChemical/Physical. The experimental hydrolysis half-life of dichlorofluoromethane in water at 25 °C and pH 7 is 234 yr (Jeffers and Wolfe, 1996).
  • ShippingUN1029 Dichlorofluoromethane or Refrigerant gas R-21 Hazard Class: 2.2; Labels: 2.2-Nonflammable compressed gas. Cylinders must be transported in a secure upright position, in a well-ventilated truck. Protect cylinder and labels from physical damage. The owner of the compressed gas cylinder is the only entity allowed by federal law (49CFR) to transport and refill them. It is a violation of transportation regulations to refill compressed gas cylinders without the express written permission of the owner.
  • IncompatibilitiesReacts violently with chemically active metals: sodium, potassium, calcium, powdered aluminum; zinc, magnesium, alkali, alkaline earth. Reacts with acids or acid fumes producing highly toxic chlorine and fluorine fumes. Attacks some forms of plastics, rubber, and coatings.
  • Waste DisposalReturn refillable compressed gas cylinders to supplier. Incineration, preferably after mixing with another combustible fuel. Care must be exercised to assure complete combustion to prevent the formation of phosgene. An acid scrubber is necessary to remove the halo acids produced. Because of recent discovery of potential ozone decomposition in the stratosphere, this material should be released to the atmosphere only as a last resort
Dichloromonofluoromethane Preparation Products And Raw materials
Dichloromonofluoromethane(75-43-4)Related Product Information
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