R-1234ze

1,3,3,3-Tetrafluoropropene (HFO-1234ze(E), R-1234ze) is a hydrofluoroolefin. It was developed as a “fourth generation” refrigerant to replace fluids such as R-134a, as a blowing agent for foam and aerosol applications, and in air horns and gas dusters. The use of R-134a is being phased out because of its high global-warming potential. HFO-1234ze(E) itself has zero ozone-depletion potential (ODP=0), a very low global-warming potential (GWP < 1 ), even lower than CO2, and it is classified by ANSI/ASHRAE[4] as class A2L refrigerant (lower flammability and lower toxicity).