Refrigerant ODP (Ozone Depletion Potential) is a relative measure of a refrigerant’s ability to damage stratospheric ozone, using CFC-11 as the reference standard with ODP value of 1. ODP values quantify chlorine and bromine atom release when refrigerants reach the upper atmosphere, with higher values indicating greater ozone destruction potential. Zero-ODP refrigerants contain no ozone-depleting halogenated compounds.
Historical Significance and Regulation
The Montreal Protocol of 1987 established ODP-based phase-out schedules for damaging refrigerants. R-22 has an ODP of 0.055, while R-410A and modern alternatives have ODP values of zero. Complete elimination of high-ODP refrigerants like R-12 (ODP 1.0) has successfully arrested ozone layer damage since the 1990s.
Current Application
All currently approved HVAC refrigerants have ODP values of zero or near-zero, making ozone protection largely resolved in the industry. However, understanding ODP remains important for maintaining legacy equipment and identifying old refrigerants requiring proper disposal. This knowledge helps technicians prevent environmental damage through correct refrigerant handling and recovery procedures during equipment servicing and decommissioning.