Ozone depletion potential

The ozone depletion potential ( ODP , abbreviation for Ozone Depletion Potential ) of a chemical compound is a measure of the relative effect of the depletion of the ozone layer ( ozone hole ) that can be triggered by the substance, based on the ODP value 1 in the Montreal Protocol specified substance trichlorofluoromethane ( R11 ).

Classification and examples

The ozone depletion potential can be estimated from the composition of a substance. Chlorofluorocarbons have an ozone depletion potential around 1. Brominated substances usually have higher ozone depletion potentials in the range of 5 to 15, since bromine reacts more aggressively with ozone . Due to the presence of hydrogen, chlorinated hydrocarbons usually have ozone depletion potentials in the range from 0.005 to 0.2. Pure fluorocarbons do not break down ozone and thus have an ozone breakdown potential of 0.

The EPA divides substances with ozone depletion potential into Class I (ODP ≥ 0.2) and Class II (ODP <0.2). Since the Montreal Protocol of 1987, the values ​​have been adjusted twice to ODP2 (40 CFR 82) and ODP3 (WMO 2006).

Abbreviation	Refrigerant	ODP
R-11	Trichlorofluoromethane	1
R-12	Dichlorodifluoromethane	1
R-22	Chlorodifluoromethane	0.055
R-115	Chloropentafluoroethane	0.5
R-123	2,2-dichloro-1,1,1-trifluoroethane	0.0015
R-124	1-chloro-1,2,2,2-tetrafluoroethane	0.03
R-134a	1,1,1,2-tetrafluoroethane	0
Halon 1301	Bromotrifluoromethane	10

See also

• The global warming potential is the measure analogous to the ODP to describe the relative effect of the greenhouse effect.

Individual evidence

1. ↑ Entry on ozone depletion potential. In: Römpp Online . Georg Thieme Verlag, accessed April 19, 2011.
2. ↑ ^{a b} EPA: Class I Ozone-depleting Substances; Retrieved April 20, 2011.
3. ↑ ^{a b} EPA: Class II Ozone-Depleting Substances; Retrieved April 20, 2011.
4. ↑ Focus on heat pumps - refrigerants .
5. ↑ ^{a b} refrigerants.com: Technical Guidelines R-123 and R-124 (PDF; 60 kB).

Web links

• List of substances with ODP