1-Chloro-1,1-difluoroethane

  • Freon 142
  • HCFC-142b
  • 1,1-Difluoro-1-chloroethane
Formula
C2H3ClF2
Structure
Description
Colorless gas with a faint odor.
Uses
Aerosol propellant for non-food use, chemical intermediate for vinylidene fluoride.

Registry Numbers and Inventories.
CAS
75-68-3
EC (EINECS/ELINCS)
200-891-8
RTECS
KH7650000
RTECS class
Mutagen; Reproductive Effector
UN (DOT)
2517
Beilstein/Gmelin
1731584
Beilstein Reference
4-01-00-00127
Swiss Giftliste 1
G-4171
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C2H3ClF2
Formula mass
100.50
Melting point, °C
-130.8
Boiling point, °C
-9.2
Vapor pressure, mmHg
7786 (25 C)
Vapor density (air=1)
3.49
Critical temperature
137
Critical pressure
40.69
Density
1.107 g/m<sup>3<sup> (25 C)
Solubility in water
Slightly soluble
Viscosity
0.50 cp (-91 C)
Partition coefficient, pKow
1.8
Heat of fusion
2.7 kJ/mol
Heat of vaporization
23.27 kJ/mol

Hazards and Protection.
Storage
Grounding and bonding required. Keep separated from incompatible substances. Avoid heat, flames, sparks and other sources of ignition.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate chemical protective gloves and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus when fighting fires involving this material.
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors.
Stability
Stable at normal temperatures and pressure.
Incompatibilities
Can react violently with strong reducing agents such as the very active metals and the active metals Can react with strong oxidizing agents or weaker oxidizing agents under extremes of temperature.
Decomposition
When heated to decomposition, emits toxic fumes of hydrogen fluoride and hydrogen chloride. Under certain conditions, fluorocarbon vapors may decompose on contact with flames or hot surfaces, creating potential hazard of inhalation of toxic decomposition products.

Fire.
Flash Point,°C
-65
Autoignition, °C
632
Upper exp. limit, %
17.9
Lower exp. limit, %
6.2
Fire fighting
Do not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
EXTREMELY FLAMMABLE.
Hazards
Vapors from liquefied gas are initially heavier than air and spread along ground. Vapors may travel to source of ignition and flash back. Containers may explode when heated. Ruptured cylinders may rocket.
Combustion products
All fluorocarbons will undergo thermal decomposition when exposed to flame or red-hot metal.
Health
2
 
Flammability
4
 
 
Reactivity
0
 

Health.
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
Pulmonary irritation, bronchial constriction, cough, dyspnea, and chest tightness may develop after inhalation. Chronic pulmonary hyperreactivity may occur. Adult respiratory distress syndrome has been reported following acute inhalational exposures. Pulmonary edema is an autopsy finding in fatal cases.
   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
EYES - Eye irritation occurs with ambient exposure. Frostbite of the lids may be severe. NOSE - Nasal irritation occurs with ambient exposure. THROAT - Irritation occurs. Frostbite of the lips, tongue, buccal mucosa and hard palate developed in a man after deliberate inhalation.

First aid
 
   Ingestion
These substances may cause frostbite to the upper airway and gastrointestinal tract after ingestion. Administer oxygen and manage airway as clinically indicated. Emesis, activated charcoal, and gastric lavage are not recommended.
   Inhalation
Provide a quiet calm atmosphere to prevent adrenaline surge if the patient is seen before the onset of cardiac arrhythmias. Minimize physical exertion.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists. If frostbite has occurred, refer to dermal treatment in the main body of this document for rewarming.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility. Ophthamologic consultation should be obtained in any symptomatic patients.

Transport.
UN number
2517
Response guide
Hazard class
2.1
36. Halogenated hydrocarbons
Std. Transport #
4905720 4905740