The HCFCs are a class of chemicals that have been used to replace the CFCs. They contain chlorine and thus deplete stratospheric ozone, but to a much lesser extent than CFCs. HCFCs have ozone depletion potentials (ODPs) ranging from 0.01 to 0.1. As CFC and TCA were phased out of use, HCFC-141b became a popular replacement. Like CFC’s and TCA, 141b has no flashpoint, dries very quickly and leaves no residue. Unfortunately, at 0.1m it has one of the highest ODP’s of any solvent still being produced.

A table of ozone-depleting substances shows their ODPs, GWPs, and CAS numbers. HCFCs are numbered according to a standard scheme. The National Oceanic and Atmospheric Administration provides more detailed information about HCFCs on their web site.