Trifluoromethane, refrigerated liquid

  • Fluoroform
  • Freon 23
  • Methyl trifluoride
  • Carbon trifluoride
  • Methane, trifluoro
Formula
CHF3
Structure
Description
A colorless odorless gas.
Uses
Intermediate in organic synth, direct coolant for infrared detector cells, blowing agent for urethane foams.

Registry Numbers and Inventories.
CAS
75-46-7
EC (EINECS/ELINCS)
200-872-4
RTECS
PB6900000
RTECS class
Mutagen
UN (DOT)
1984
Merck
13,4200
Beilstein/Gmelin
1731035
Beilstein Reference
4-01-00-00024
Swiss Giftliste 1
G-4304
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CHF3
Formula mass
70.01
Melting point, °C
-155.18
Boiling point, °C
-82.1
Vapor pressure, mmHg
35300 (25 C)
Vapor density (air=1)
2.4
Critical temperature
26
Critical pressure
47.32
Density
1.935 (solid); 1.52 (liquid)g/cm3 (-100 C)
Solubility in water
Insoluble
Viscosity
0.0146 cp (25 C)
Refractive index
1.00043 (25 C)
Partition coefficient, pKow
0.64
Heat of vaporization
16.70 kJ/mol

Hazards and Protection.
Storage
May be stored over water.
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 clothing.
Respirators
Wear positive pressure self-contained breathing apparatus.
Small spills/leaks
Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors.
Stability
Stable up to 1150 C.
Incompatibilities
Attacks magnesium and its alloys.
Decomposition
When heated to decomposition it emits toxic fumes of hydrogen fluoride. All fluorocarbons will undergo thermal decomposition when exposed to flame or red-hot metal.

Fire.
Flash Point,°C
-112
Upper exp. limit, %
35.3
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Do not use water on material itself. Use water spray to knock-down vapors.
Fire potential
May burn but does not ignite readily.
Hazards
Containers may explode when heated. Ruptured cylinders may rocket.
Combustion products
When heated to decompose it emits toxic fumes ofhydrogen fluoride.
Health
2

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
Vapors may cause dizziness or asphyxiation without warning.
   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
See Skin.

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
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Administer oxygen if breathing is difficult.
   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
If symptoms develop, immediately move individual away from exposure and into fresh air. Flush eyes gently with water for at least 15 minutes while holding eyelids apart; seek immediate medical attention.

Transport.
UN number
1984
Response guide
Hazard class
2.2
36. Halogenated hydrocarbons
Std. Transport #
4904582