A fairly new entry in the interim refrigerant market contains the largest percentage yet of R-22 and is said to have a rather wide range of aftermarket applications. R-411C (a.k.a. G2018C and HCFC-411C) contains 95.5% R-22 and small percentages of R-1270 (propylene) and R-152 (an HFC refrigerant).
Most interim refrigerants have R-22 in the range of 30% to 60% of the composition. The R-411 series upped the ante, starting with R-411A at 87.5% R-22 and R-411B with 95% R-22.