Tetrafluoroethylene

  • Tetrafluorethene
  • Perfluoroethene
  • Perfluoroethylene
  • TFE
Formula
C2F4
Structure
Description
A colorless, odorless gas.
Uses
In prepn of propellants for food product aerosols.

Registry Numbers and Inventories.
CAS
116-14-3
EC (EINECS/ELINCS)
204-126-9
RTECS
KX4000000
RTECS class
Tumorigen; Drug; Reproductive Effector
UN (DOT)
1081
Beilstein/Gmelin
1098492
Swiss Giftliste 1
G-3850
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C2F4
Formula mass
100.02
Melting point, °C
-142.5
Boiling point, °C
-76.3
Vapor pressure, mmHg
24500
Vapor density (air=1)
3.9
Critical temperature
33.3
Critical pressure
37.7
Density
1.519 g/cm3 (20 C)
Solubility in water
Insoluble
Partition coefficient, pKow
1.37

Hazards and Protection.
Storage
Cylinders containing tetrafluoroethylene under high pressure.Should be stored in a cool, well-ventilated area and protected against accidental impacts store in a cool, dry, well-ventilated location. Separate from oxidizing materials, air, sulfur trioxide, halogen compounds. Outside or detached storage is preferred.
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
Self-contained breathing apparatus for high concentration.
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
Closed containers may rupture violently when heated. Polymerizes easily.
Incompatibilities
Reacts with air (oxygen) to form polymeric peroxides that are explosive May react violently with aluminum.
Decomposition
When heated to decomposition it emits highly toxic fumes of hydrogen fluoride.

Fire.
Flash Point,°C
-108
Autoignition, °C
200
Upper exp. limit, %
60
Lower exp. limit, %
11
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
Atmospheric concentration of tetrafluoroethylene should not be allowed in contact with open flames. Flammable, dangerous fire risk
Hazards
Vapor is heavier than air and may travel considerable distance to source of ignition and flash back..Toxic impurities formed during preparation or pyrolysis of tetrafluoroethylene, particularly octafluoroisobutylene...Are hazardous.
Combustion products
When burned in air, gas forms toxic carbonyl fluoride and hydrogen fluoride.
Health
2
 
Flammability
4
 
 
Reactivity
3
 

Health.
Exposure limit(s)
2 ppm TLV
Carcinogin
G-A3, I-2B, N-2, CP65
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
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
1081
Response guide
Hazard class
2.1
USCG CHRIS Code
TFE
 
Std. Transport #
4905783