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HFC-143a (Trifluoroethane)
Identification
Synonyms: 1,1,1-Trifluoroethane (IUPAC); Freon 143a; R143a; R-143a; HCFC143a
CAS No.: 420-46-2 EC No.: 206-996-5 RTECS No.:
Molecular Weight: 84.041
Molecular Formula: C2H3F3
Structural Formula: 
m.p.: -111°C
b.p. (1 atm): -47.75°C
Density (25°C): 1.300g/cm3
Vapor Pressure: 1.247mPa
Critical T.: 73.15°C
Critical P.: 3.834 mPa
Critical Density: 0.455g/cm3
ODP: 0
GWP: 4300 (CO2=1)
Chemical and Physical properties: Stable in normal condition. Colorless and odorless gas.
(Note: isomer 1,1,2-Trifluoroethane: HFC-143b)
Preparation
HFC-143a can be made by floridation reaction between HCFC-142b (1,1-difluoro-1-chloroethane) and hydrofluoric acid.
Application
HCFC-143a is used as a component of azeotropic-like blend refrigerant such as R507 (with 50% HFC-143a), R404a (with 52% HFC-143a), R-408a (with 47% HFC-143a)
Specification*
| Items | Specification |
|---|---|
| HFC-143a content, % | 99.8 min |
| moisture, mg/kg | 10 max |
| acidity,ppm | 0.1 max |
| nonvolatile residues | 100 mg/kg max. |
Standard Packaging
320kgs/400L steel cylinder; 730kg/926L (13 cylinders/20’ FCL); ISO tank
Filling ratio: 0.79
Risks and Safety Information
HFC-143a is regulated by UN as flammable gas with UN 2035,
Class 2.1,
PG unknown
R-Phrase: R12
S-Phrase: S9, S16, S33
For more information, please see MSDS