1,2-Difluoroethane

  • Ethylene difluoride
  • Freon 152
  • R 152
Formula
C2H4F2
Structure
Description
Colorless, odorless gas.
Uses
Refrigerant.

Registry Numbers and Inventories.
CAS
624-72-6
RTECS
KI1410500
RTECS class
Mutagen
UN (DOT)
1030
Beilstein/Gmelin
1730859
Beilstein Reference
4-01-00-00121
Swiss Giftliste 1
G-6902
Japan ENCS (MITI)
Listed

Properties.
Formula
C2H4F2
Formula mass
66.06
Melting point, °C
-160
Boiling point, °C
-30
Critical temperature
107.5
Critical pressure
43.9
Density
1.08 g/cm3
Solubility in water
Soluble
Refractive index
1.28701 (20.4 C)
Partition coefficient, pKow
0.62

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
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 protective gloves, clothing and goggles. Always wear thermal protective clothing when handling refrigerated/cryogenic liquids.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Make no contact with the spilled material. ELIMINATE all ignition sources, combustibles and ground all equipment. Take up with sand or other noncombustible absorbent material and place into containers for later disposal.
Stability
No data.

Fire.
Flash Point,°C
-37
Upper exp. limit, %
21.5
Lower exp. limit, %
4.6
Fire fighting
If material on fire or involved in fire: Do not extinquish fire unless flow can be stopped. Use water in flooding quantities as fog. Cool all affected containers with flooding quantitites of water. Apply water from as far a distance as possible. Wear positive pressure self-contained breathing apparatus when fighting fires involving this material. Approach fire with caution. If fire becomes uncontrollable or container is exposed to direct flame consider evacuation of one-half (12) mile radius.
Fire potential
EXTREMELY FLAMMABLE. Will be easily ignited by heat, sparks or flames. Will form explosive mixtures with air.
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.
Combustion products
All fluorocarbons will undergo thermal decomposition when exposed to flame or red-hot metal.

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
May cause irritation.

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
1030
Response guide
Hazard class
2.1
36. Halogenated hydrocarbons