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Class I Ozone-Depleting Substances

 The list of Class II substances (the HCFCs) is here. 

 Global warming potentials (GWPs) for selected non-ozone-depleting substances are provided in

another table. 

Why are there three values given for the ODPs and four values given for the GWPs? 

The numbers in the “ODP-1” column are from Table 1-5 of The Scientific Assessment of 

Ozone Depletion, 2002, a report of the World Meteorological Association’s Global Ozone 

Research and Monitoring Project. The ODPs in the “ODP-1” column that were not in Table 

1-5 of the 2002 report have not been updated since 1998 and are from The Scientific

Assessment of Ozone Depletion, 1998. The “ODP-2” column numbers are from the Montreal 

Protocol, and the “ODP-3” column numbers are from 40 CFR Part 82, stratospheric ozone 

protection regulations required by title VI of the Clean Air Act amendments.

All GWP values represent global warming potential over a 100-year time horizon. The 

numbers in the “GWP-1” column are from Table 1-6 of The Scientific Assessment of Ozone 

Depletion, 2002, a report of the World Meteorological Association’s Global Ozone Research 

and Monitoring Project. The GWPs in the “GWP-1” column that were not provided Table 1-6 

of the 2002 report have not been updated since 1998 and are from The Scientific

Assessment of Ozone Depletion, 1998. “GWP-2” column numbers are from the 

Intergovernmental Panel on Climate Change (IPCC ) Second Assessment 

Report: Climate Change 1995, “GWP-3” column numbers are from the IPCC Third

Assessment Report: Climate Change 2001, and “GWP-4” column numbers are from 40 CFR 

Part 82, stratospheric ozone protection regulations required by title VI of the Clean Air Act 

amendments.

Under section 602 of the Clean Air Act, EPA was required to list in the Federal Register the GWPs 

for ozone-depleting substances. That list was published on January 19, 1996.

 Blanks in the data indicate that the information was not shown in the original source. 

Chemical Name Lifetime,

in years

ODP1 

(WMO 

20021)

ODP2 

(Montreal 

Protocol)

ODP3 

(40 

CFR)

GWP1 

(WMO 

2002)

GWP2 

(SAR)

GWP3 

(TAR)

GWP4 

(40 

CFR)

CAS 

Number

Group I (from section 602 of the CAA)

CFC-11 (CCl3F)

Trichlorofluoromethane 45 1.0 1.0 1.0 4680 3800 4600 4000 75-69-

4

CFC-12 (CCl2F2)

Dichlorodifluoromethane 100 1.0 1.0 1.0 10720 8100 10600 8500 75-71-

8

CFC-113 (C2F3Cl3)

1,1,2-Trichlorotrifluoroethane 85 1.0 0.8 1.0 6030 4800 6000 5000 76-13-

1

CFC-114 (C2F4Cl2)

Dichlorotetrafluoroethane 300 0.94 1.0 1.0 9880 9800 9300 76-14-

2

CFC-115 (C2F5Cl)

Monochloropentafluoroethane 1700 0.44 0.6 0.6 7250 7200 9300 76-15-

3

Group II (from section 602 of the CAA)

Halon 1211 (CF2ClBr)

Bromochlorodifluoromethane 16 6.0 3.0 3.0 1860 1300 353-

59-3

Halon 1301 (CF3Br) 75-63-

U.S. EPA: Class I Ozone-Depleting Substances Page 1 of 4

http://www.epa.gov/ozone/ods.html 2/15/2007
Bromotrifluoromethane 65 12 10.0 10.0 7030 6900 8

Halon 2402 (C2F4Br2)

Dibromotetrafluoroethane 20 <8.6 6.0 6.0 1620 124-

73-2

Group III (from section 602 of the CAA)

CFC-13 (CF3Cl)

Chlorotrifluoromethane 640 1.0 1.0 1.0 14190 14000 11700 75-72-

9

CFC-111 (C2FCl5)

Pentachlorofluoroethane 1.0 1.0 1.0 354-

56-3

CFC-112 (C2F2Cl4)

Tetrachlorodifluoroethane 1.0 1.0 1.0 76-12-

0

CFC-211 (C3FCl7)

Heptachlorofluoropropane 1.0 1.0 1.0 422-

78-6

CFC-212 (C3F2Cl6)

Hexachlorodifluoropropane 1.0 1.0 1.0 3182-

26-1

CFC-213 (C3F3Cl5)

Pentachlorotrifluoropropane 1.0 1.0 1.0 2354-

06-5

CFC-214 (C3F4Cl4)

Tetrachlorotetrafluoropropane 1.0 1.0 1.0 29255-

31-0

CFC-215 (C3F5Cl3)

Trichloropentafluoropropane 1.0 1.0 1.0 4259-

43-2

CFC-216 (C3F6Cl2)

Dichlorohexafluoropropane 1.0 1.0 1.0 661-

97-2

CFC-217 (C3F7Cl)

Chloroheptafluoropropane 1.0 1.0 1.0 422-

86-6

Group IV (from section 602 of the CAA)

CCI4

Carbon tetrachloride 26 0.73 1.1 1.1 1380 1400 1800 1400 56-23-5

Group V (from section 602 of the CAA)

Methyl Chloroform

(C2H3Cl3)

1,1,1-trichloroethane

5.0 0.12 0.1 0.1 144 140 110 71-55-

6

Group VI (listed in the Accelerated Phaseout Final Rule)

Methyl Bromide (CH3Br) 0.7 0.38 0.6 5 5

74-83-

9

Group VII (listed in the Accelerated Phaseout Final Rule)

CHFBr2 1.0 1.0

HBFC-12B1 (CHF2Br) 0.74 0.74

CH2FBr 0.73 0.73

C2HFBr4 0.3 -

0.8 0.3-0.8

C2HF2Br3 0.5 -

1.8 0.5 - 1.8

C2HF3Br2 0.4 -

1.6 0.4 - 1.6

C2HF4Br 0.7 -

1.2 0.7 - 1.2

C2H2FBr3 0.1 -

1.1 0.1 - 1.1

C2H2F2Br2 0.2 -

1.5 0.2 - 1.5

C2H2F3Br 0.7 -

1.6 0.7 - 1.6

C2H3FBr2 0.1 -

1.7 0.1 - 1.7

U.S. EPA: Class I Ozone-Depleting Substances Page 2 of 4

http://www.epa.gov/ozone/ods.html 2/15/2007
1 The Scientific Assessment of Ozone Depletion, 2002 updated a limited number of GWPs and 

ODPs (semiempirical values for all updated ODPs except CFC-114 and CFC-115, which are 

model-derived). All GWPs and ODPs that were not updated in 2002 are 1998 values that have not 

changed.

 Class II ozone-depleting chemicals are listed in a different table.

C2H3F2Br 0.2 -

1.1 0.2 - 1.1

C2H4FBr 0.07 -

0.1

0.07 -

0.1

C3HFBr6 0.3 -

1.5 0.3 - 1.5

C3HF2Br5 0.2 -

1.9 0.2 - 1.9

C3HF3Br4 0.3 -

1.8 0.3 - 1.8

C3HF4Br3 0.5 -

2.2 0.5 - 2.2

C3HF5Br2 0.9 -

2.0 0.9 - 2.0

C3HF6Br 0.7 -

3.3 0.7 - 3.3

C3H2FBr5 0.1 -

1.9 0.1 - 1.9

C3H2F2Br4 0.2 -

2.1 0.2 - 2.1

C3H2F3Br3 0.2 -

5.6 0.2 - 5.6

C3H2F4Br2 0.3 -

7.5 0.3 - 7.5

C3H2F5Br 0.9 -

1.4 0.9 - 1.4

C3H3FBr4 0.08 -

1.9

0.08 -

1.9

C3H3F2Br3 0.1 -

3.1 0.1 - 3.1

C3H3F3Br2 0.1 -

2.5 0.1 - 2.5

C3H3F4Br 0.3 -

4.4 0.3 - 4.4

C3H4FBr3 0.03 -

0.3

0.03 -

0.3

C3H4F2Br2 0.1 -

1.0 0.1 - 1.0

C3H4F3Br 0.07 -

0.8

0.07 -

0.8

C3H5FBr2 0.04 -

0.4

0.04 -

0.4

C3H5F2Br 0.07 -

0.8

0.07 -

0.8

C3H6FBr 0.02 -

0.7

0.02 -

0.7

Group VIII (from the Chlorobromomethane Phaseout Final Rule)

CH2BrCl

Chlorobromomethane 0.37 0.12 0.12

U.S. EPA: Class I Ozone-Depleting Substances Page 3 of 4

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Last updated on Wednesday, March 8th, 2006

URL: http://www.epa.gov/ozone/ods.html 

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