The Shift to Natural Refrigerants is Possible

Stacked bar chart of the refrigerant mix in percent, 1991 to 1998 (no bar for 1996). 1991 and 1992: R12 only. 1993: mostly R12, with 15 percent R134a and 2 percent R600a. 1994: 72 percent R134a and 28 percent R600a. 1995: 85 percent R600a and 15 percent R134a. 1997: 98 percent R600a. 1998: 99 percent R600a.