Dichlorodifluoromethane

  • Refrigerant 12
  • Freon 12
  • Halon 12
  • Difluorodichloromethane
Formula
CCl2F2
Structure
Description
A colorless gas with a faint ethereal odor.
Uses
Refrigerant, aerosol propellant.

Registry Numbers and Inventories.
CAS
75-71-8
EC (EINECS/ELINCS)
200-893-9
RTECS
PA8200000
RTECS class
Human Data
UN (DOT)
1028
Merck
12,3114
Beilstein/Gmelin
1732393
Beilstein Reference
4-01-00-00040
RCRA
U075
EPA OPP
14
Swiss Giftliste 1
G-1527
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CCl2F2
Formula mass
120.91
Melting point, °C
-157.8
Boiling point, °C
-29.79
Vapor pressure, mmHg
4249 (20 C)
Vapor density (air=1)
4.2
Critical temperature
111.8
Critical pressure
40.7
Density
1.4883 g/cm3 (-30 C)
Solubility in water
0.028 g/100 mL
Viscosity
0.262 cp (20 C)
Surface tension
11.7 g/s2 (0 C)
Dipole moment
0.51 D
Partition coefficient, pKow
2.16
Thermal expansion
0.0035/K at 15 C
Heat of vaporization
20.9 kJ/mol

Hazards and Protection.
Storage
Store at room temperature. Venting: safety relief.
A
Handling
Containers of this material may be hazardous when emptied. Since emptied containers retain product residues (vapor, liquid, and/or solid), all hazard precautions given in the data sheet must be observed.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Attempt to stop leak if without undue personnel hazard.
Stability
Stable.
Incompatibilities
Avoid contact with chemically-active metals such as sodium, potassium, calcium, powdered aluminum, zinc and magnesium. On contact with acids or acid there is the evolution of highly toxic
Decomposition
Carbonyl fluoride, hydrogen chloride, hydrogen fluoride phosgene.

Fire.
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
Nonflammable gas
Hazards
Vapors from liquefied gas are initially heavier than air and spread along ground.
Combustion products
Although nonflammable, dissociation products generated in a fire may be irritating or toxic.
Health
1
 
Flammability
0
 
 
Reactivity
1
 

Health.
Exposure limit(s)
OSHA PEL: TWA 1000 ppm (4950 mg/m3) NIOSH REL: TWA 1000 ppm (4950 mg/m3) NIOSH IDLH: 15,000 ppm
Poison_Class
5
Exposure effects
Headache, dizziness, and disorientation are common. Cerebral edema may be found on autopsy. Dichlorodifluoromethane was not teratogenic in rats and rabbits. <br>The reproductive effects of 1,1,1,2-tetrafluoroethane were studied in rats. No adverse effects on reproductive performance was noted or on the development, maturation or reproductive performance of up to two successive generations.
   Ingestion
Nausea may develop. Ingestion of a small amount of trichlorofluoromethane resulted in necrosis and perforation of the stomach in one patient.
   Inhalation
Vapors may cause dizziness or asphyxiation without warning.
   Skin
Dermal contact may result in defatting, irritation or contact dermatitis. Severe frostbite has been reported as an effect of freon exposure. Injection causes transient pain, erythema and edema.
   Eyes
See Skin.

First aid
 
   Ingestion
This compound is a gas, therefore inhalation is the first route of exposure.
   Inhalation
IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. If symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop, call a physician and be prepared to transport the victim to a hospital. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used.
   Skin
CAUTION: Exposure of skin to compressed gases may result in freezing of the skin. Treatment for frostbite may be necessary. Remove the victim from the source of contamination. IMMEDIATELY wash affected areas gently with COLD water (and soap, if necessary) while removing and isolating all contaminated clothing. Dry carefully with clean, soft towels. If symptoms such as inflammation or irritation develop, IMMEDIATELY call a physician or go to a hospital for treatment.
   Eyes
First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. If symptoms (such as redness or irritation) develop, immediately transport the victim to a hospital.

Transport.
UN number
1028
Response guide
Hazard class
2.2
USCG CHRIS Code
DCF
 
36 Halogenated hydrocarbons
Std. Transport #
4904532
 
IMO Gas Code
B