1,1,1-Trifluoroethane

  • Freon 143a
Formula
C2H3F3
Structure
Description
Clear, colorless liquid or vapor with a faint ether odor.
Uses
Refrigerant gas.

Registry Numbers and Inventories.
CAS
420-46-2
EC (EINECS/ELINCS)
206-996-5
RTECS
KJ4110000
RTECS class
Mutagen; Reproductive Effector
UN (DOT)
2035
Beilstein/Gmelin
1731552
Beilstein Reference
4-01-00-00122
Swiss Giftliste 1
G-174417
US TSCA
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C2H3F3
Formula mass
84.05
Melting point, °C
-111.34
Boiling point, °C
-50
Vapor pressure, mmHg
2400
Vapor density (air=1)
2.92
Critical temperature
346
Critical pressure
37.15
Density
0.942 g/cm3 (20 C)
Solubility in water
Insoluble
Viscosity
0.0992 cp (35 C)
Surface tension
2.24 g/s2 (45 C)
Heat of vaporization
15.93 kJ/mol

Hazards and Protection.
Storage
Store in a clean, dry place. Keep cool.
Handling
Should not be used for any purpose above atmospheric pressure. Use with sufficient ventilation. Do not mix with air.
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
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
Stable at normal temperatures and pressures.
Incompatibilities
Can react with some metals to form dangerous products Incompatible with strong oxidizing and reducing agents Incompatible with many amines, nitrides, azo/diazo compounds, alkali metals, and epoxides.
Decomposition
Oxides of carbon, hydrogen fluoride.

Fire.
Upper exp. limit, %
20.5
Fire fighting
Do not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog. Solid streams of water may be ineffective. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
EXTREMELY FLAMMABLE.
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. Ruptured cylinders may rocket.

Health.
Poison_Class
-
Exposure effects
The toxological properties of this substance have not been fully investigated.
   Ingestion
Unlikely route of exposure.
   Inhalation
Vapors may cause dizziness or asphyxiation without warning. Some may be irritating if inhaled at high concentrations.
   Skin
Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.
   Eyes
May cause irritation.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Administer oxygen if breathing is difficult.
   Skin
Remove and isolate contaminated clothing and shoes. Clothing frozen to the skin should be thawed before being removed. In case of contact with liquefied gas, thaw frosted parts with lukewarm water
   Eyes
Flush with running water for at least 20 minutes.

Transport.
UN number
2035
Response guide
Hazard class
2.1
36. Halogenated hydrocarbons
Std. Transport #
4905787