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HYDROFLUOROCARBON-404A 41 HFC-143A Chemical and Physical Properties Common name: HFC-143a Chemical name: 1,1,1-Trifluoroethane Synonyms: FC-143a; hydrofluorocarbon 143a CAS number: 420-46-6 Structural formula: CH3CF3 Description: Colorless gas Molecular weight: 84.04 Boiling point: -47.3°C at 760 mm Hg Melting point: -111.3°C Flash point and flammability: -90°C Solubility: Soluble in chloroform and ether Auto-ignition: 750°C Conversion factors: 1 ppm = 3.40 mg/m3; 1 mg/m3 = 0.29 ppm Toxicokinetics In a study of rats exposed by inhalation to HFC-143a at 4,800 ppm for 4-5 hr, 2,2,2-trifluoroethanol was the only metabolite detected. Nuclear magnetic resonance showed that HFC-143a was metabolized slowly, primarily through an oxidative route (DuPont 1994, as cited in AIHA 1996).