1,1-Difluoroethylene

  • Vinylidene fluoride
  • 1,1-Difluoroethene
  • R 1132a
Formula
C2H2F2
Structure
Description
Colorless gas with a faint, sweek odor.
Uses
Manufacture of polymers & copolymers, chemical intermediate.

Registry Numbers and Inventories.
CAS
75-38-7
EC (EINECS/ELINCS)
200-867-7
S 9 16 33
RTECS
KW0560000
RTECS class
Tumorigen; Mutagen
UN (DOT)
1959
Beilstein/Gmelin
1733321
Beilstein Reference
4-01-00-00696
Swiss Giftliste 1
G-4204
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C2H2F2
Formula mass
64.04
Melting point, °C
-143.9
Boiling point, °C
-86
Vapor pressure, mmHg
26200 (25 C)
Vapor density (air=1)
2.2
Critical temperature
30.1
Critical pressure
43.8
Density
0.617 g/cm3 (20 C)
Solubility in water
Insoluble
Viscosity
7.7574 pascal-seconds
Surface tension
0.039942 newtons/m
Partition coefficient, pKow
1.24
Heat of vaporization
17.1 kJ/mol
Heat of combustion
-6920 kJ/mol

Hazards and Protection.
Storage
Keep separated from incompatible substances. Store in a tightly closed container. Containers must have overpressure release device. Avoid heat, flames, sparks and other sources of ignition. Keep separated from incompatible substances.
A B1
Handling
Handle in accordance with all current regulations and standards. Subject to storage regulations: U.S. OSHA 29 CFR 1910.101.
Protection
Wear appropriate clothing to prevent any reasonable probability of skin contact. Wear eye protection to prevent any possibility of eye contact.
Respirators
Any self contained breathing apparatus with a full facepiece and operated in a pressure demand or other positive pressure mode or any supplied air respirator with a full facepiece and operated in a pressure demand or other positive pressure mode in combination with an auxiliary self contained breathing apparatus operated in pressure demand or other positive pressure mode.
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
Polymerizes easily.
Incompatibilities
Sensitive to heat Incompatible with oxidizers It
Decomposition
The substance can form explosive peroxides. The substance may polymerize releasing a large amount of heat, with fire or explosion hazard. Heating may cause violent combustion or explosion. Decomposes on heating or on burning producing toxic and corrosive fumes including hydrogen fluoride, fluorine and fluorides.

Fire.
Flash Point,°C
-126
Autoignition, °C
640
Upper exp. limit, %
21.3
Lower exp. limit, %
5.5
Fire fighting
Do not extinguish fire unless flow can be stopped. Use alcohol foam, dry chemical or carbon dioxide. 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
May polymerize explosively when heated or involved in a fire. 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
Fire may produce irritating and/or toxic gases.
Health
1
 
Flammability
4
 
 
Reactivity
2
 

Health.
Exposure limit(s)
NIOSH REL: TWA 1 ppm C 5 ppm use 1910.1017
Poison_Class
-
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
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. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.

Transport.
UN number
1959
Response guide
Hazard class
2.1
36. Halogenated hydrocarbons
Std. Transport #
4905714