R-134a (1,1,1,2-tetrafluoroethane) is a clear, colorless gas with a faint ethereal odor. As a non-ozone-depleting, environmentally safer single component HFC refrigerant, it is a very efficient and safe replacement for R-12 in several air-conditioning and refrigeration applications. R-134a possesses similar energy efficiency and capacity characteristics as R-12, has an intrinsically low toxicity, and is recognized as a superior long-term solution in many applications. It can be used in automotive air conditioning, appliances, small stationary equipment, medium temperature supermarket cases, and industrial and commercial chillers.