Options to Chloroflurocarbons
The problem coolant:CFCs-To be phased out ine developing world by 2010 under the Montreal Protocol on Substances that deplete the Ozone Layer. Deplete the Ozone Layer. Deadlines could be advanced by 4 years.
| The possible substitutes | In favour | Against |
| Hydrochloroflurocarbons such as HCFC-22 | Can only be a temporary substitute to CFCs because they too... | ...have a definite ozone-depleting potential (ODP). |
| Hydroflurocarbons 1. HFC-134a | Zero ODP | Substantive global warming potential (GWP). Requires changes in compressor design and new lubricating oils. Expensive and protected by patents held by Western companies. |
| 2. HFC-152a | Does not require special lubricating oils | Toxic and flammable. Rejected by US, so not attractive to exporters. |
| Hydrocarbons such as a mix of propane and isobutane | Zero ODP. GWP is one-hundredth of HCF-134a. Requires minir changes in compressor design. Easy availability at prices one-tenth that of HCF-134a. | Inflammable. Difficult to make a freezer compartment in a fridge. |