R-134a is tetrafluoroethane developed by the partnership of DuPont/Suva, DuPont/Dymel, Arkema/Forane, and Honeywell/Genetron. Developed in the USA. Others made in ???? will consist of methyl chloride, chlorodifluoromethane, and chlorodifluoroethane. I'm not sa... Login to read more.