CAS #116-14-3 National Toxicology Program Chemical Repository
This compound is used primarily as a monomer, co-monomer and ter-monomer for polytetrafluoroethylene resins (which are used in mold coatings, electrical insulation, filter cloths, electrical tapes, gaskets and Teflon products). This chemical is also used as a propellant for food product aerosols.
NTP CHEMICAL REPOSITORY
*CATALOG ID NUMBER: 001332
*CAS NUMBER: 116-14-3
*BASE CHEMICAL NAME: TETRAFLUOROETHYLENE
*PRIMARY NAME: TETRAFLUOROETHYLENE
*CHEMICAL FORMULA: C2F4
*STRUCTURAL FORMULA: F2C=CF2
-PHYSICAL CHEMICAL DATA ======================
*PHYSICAL DESCRIPTION: LITERATURE: Colorless gas REPOSITORY: Gas
*MOLECULAR WEIGHT: 100.02
*SPECIFIC GRAVITY: Not available
*DENSITY: 1.519 @ -76 C [016,047]
*MP (DEG C): -142.5 C [016,043,135,395]
*BP (DEG C): -76.3 C [016,047,135,395]
WATER : Insoluble [062,205,395,451]
DMSO : Not available
95% ETHANOL : Not available
METHANOL : Not available
ACETONE : Not available
TOLUENE : Not available
OTHER SOLVENTS: Not available
*VOLATILITY: Vapor pressure: 22800 mm Hg @ 21.1 C  Vapor density : 3.87 [053,451]
*FLAMMABILITY (FLASH POINT): Flash point data for this chemical are not available; however, literature indicates that it is flammable . Fires involving this material can be controlled with a dry chemical, carbon dioxide or Halon extinguisher. A water spray may also be used . The autoignition temperature of this compound is 187.8 C (370 F) [053,371,451]. The inhibited monomer can decompose explo- sively when exposed to low energy thermal sources sufficient to create local temperatures of ~482 C, or when containers are exposed to a fire .
*UEL: 10% [053,371,451] LEL: 50% [053,371,451]
*REACTIVITY: This compound is incompatible with a wide range of materials including iodine pentafluoride and sulfur trioxide [043,053,066,451]. When this compound was collected in a liquid nitrogen-cooled trap open to air, it exploded . A mixture with hexafluoropropane (in air) has exploded. Chloroperoxytrifluoro- methane has initiated explosive polymerization of this compound when a mixture was prepared to -196 C and warmed to -110 C. Reactions with difluoromethylene dihypofluorite violently explode in the absence of a diluent. Ignition or explosion may occur with dioxygen difluoride. Oxygen gas added to unstabilized compound produces polymeric peroxide which is powerfully explosive, and sensitive to heat, impact or friction. Triborane pentafluoride catalyzes polymerization of this compound smoothly at temperatures less than -100 C, but explosively above that temperature [036,066]. This compound is also incompatible with metal alkoxides .
*STABILITY: A terpene inhibitor is usually added to this chemical to prevent spontaneous polymerization [036,066]. In its absence, the monomer will spontaneously explode at pressures greater than 2.7 bar [036,043,053,066]. The inhibited monomer will explode if ignited [036,043,066]. The inhibited monomer can decompose explosively when exposed to materials with which it can react exothermically .
*OTHER PHYSICAL DATA: Density: 1.1507 @ -40 C  Freezing point: -142 C [062,371] The UEL increases to 100% when large volumes and powerful igniters are used . Much heavier than air  Critical temperature: 33.3 C [135,137] Critical pressure: 38.92 atmospheres [135,137] Critical volume: 172 cm3/mol [135,137] Critical density: 0.581 kg/dm3 [135,137] Heat of combustion (estimated): -2000 cal/g  Heat of polymerization: -250 cal/g  Odorless to faint odor [053,371]
*NIOSH REGISTRY NUMBER: KX4000000
typ. dose mode specie amount units LC50 ihl rat 40000 ppm/4H LC50 ihl mus 143 gm/m3/4H LC50 ihl gpg 116 gm/m3/4H
*AQTX/TLM96: Not available
*SAX TOXICITY EVALUATION: THR: Mildly toxic by inhalation. It can act as an asphyxiant and may have other toxic properties.
*CARCINOGENICITY: Review: IARC: Not classifiable as a human carcinogen (Group 3) [015,395,610] Status: NTP Carcinogenesis Studies; on test (two year studies), January 1990
*MUTATION DATA: Not available
*TERATOGENICITY: Not available
*STANDARDS, REGULATIONS & RECOMMENDATIONS: OSHA: None ACGIH: None NIOSH Criteria Document: None NFPA Hazard Rating: Health (H): 3 Flammability (F): 4 Reactivity (R): 3 H3: Materials extremely hazardous to health but areas may be entered with extreme care (see NFPA for details). F4: Very flammable gases or very volatile flammable liquids (see NFPA for details). R3: Materials which are capable of detonation or of explosive decomposition or of explosive reaction but require a strong initiating source or which must be heated under confinement before initiation (see NFPA for details).
*OTHER TOXICITY DATA: Standards and Regulations: DOT-Hazard: Flammable gas; Label: Flammable gas Status: EPA TSCA Chemical Inventory, 1989 EPA TSCA 8(a) Preliminary Assessment Information, Proposed Rule EPA TSCA Test Submission (TSCATS) Data Base, April 1990
-OTHER DATA (Regulatory) =======================
*PROPER SHIPPING NAME (IATA): Tetrafluoroethylene, inhibited
*UN/ID NUMBER: UN1081
*HAZARD CLASS: 2 SUBSIDIARY RISK: 3 PACKING GROUP: None
*LABELS REQUIRED: Flammable gas
*PACKAGING: PASSENGER: PKG. INSTR.: Forbidden MAXIMUM QUANTITY: Forbidden CARGO : PKG. INSTR.: 200 MAXIMUM QUANTITY: 150 kg
*SPECIAL PROVISIONS: A1
*USES: This compound is used primarily as a monomer, comonomer and termonomer for polytetrafluoroethylene resins (which are used in mold coatings, electrical insulation, filter cloths, electrical tapes, gaskets and Teflon products). This chemical is also used as a propellant for food product aerosols.
*COMMENTS: Not available
-HANDLING PROCEDURES ===================
*ACUTE/CHRONIC HAZARDS: This compound is an asphyxiant and an irritant of the eyes, nose and throat [053,371]. The vapor is heavier than air and may travel a long distance to a source of ignition and flash back [053,371,451]. When heated to decomposition it emits highly toxic fumes of fluorine [043,058].
*MINIMUM PROTECTIVE CLOTHING: If Tyvek-type disposable protective clothing is not worn during handling of this chemical, wear disposable Tyvek-type sleeves taped to your gloves.
*RECOMMENDED GLOVE MATERIALS: Permeation Test Results For The Neat (Undiluted) Chemical: The permeation test results for the neat (undiluted) chemical are given below. The breakthrough times of this chemical are given for each glove type tested. The table is a presentation of actual test results, not specific recommendations or suggestions. Avoid glove types which exhibit breakthrough times of less than the anticipated task time plus an adequate safety factor. If this chemical makes direct contact with your glove, or if a tear, puncture or hole develops, replace them at once.
Glove Type Model Number Thickness Breakthrough Time Viton North F-091 0.25 mm 480 min Butyl rubber North B-174 0.61 mm 480 min PVA Edmont 29-250 0.25 mm 480 min Neoprene Edmont 29-870 0.64 mm 480 min
*RECOMMENDED RESPIRATOR: When working with this chemical, wear a NIOSH-approved full face positive pressure supplied-air respirator or a self-contained breathing apparatus (SCBA). 
*OTHER: Not available
*STORAGE PRECAUTIONS: You should store this material under ambient temperatures.
*SPILLS AND LEAKAGE: This chemical should be used in a fume hood. If a leak occurs, the main valve of the gas cylinder should be turned off and all personnel evacuated. Do not reenter the contaminated area until the Safety Officer (or other responsible person) has verified that the area has been properly ventilated.
*DISPOSAL AND WASTE TREATMENT: Not available
-EMERGENCY PROCEDURES ====================
*SKIN CONTACT: 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.
*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; if not available, use a level of protection greater than or equal to that advised under Respirator Recommendation.
*EYE CONTACT: 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.
*INGESTION: This compound is a gas, therefore inhalation is the first route of exposure. *SYMPTOMS: Symptoms of exposure to this compound include fever, chills, rigour-like shaking of the limbs and mild respiratory discomfort . Irritation of the eyes, nose and throat may occur [053,371]. It may cause asphyxiation and unconsciousness . It may also cause sore throat, weakness, difficulty in breathing, malaise and numbness and tingling in the arms and fingers . Excessive sweating may occur . Other symptoms include nausea, dry cough, dizziness, headache, tightness in the chest and pyrexia .
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