Guidance
Ozone-depleting substances (ODS)
Groups of ODS with their ozone-depleting potential.
If you work with ozone-depleting substances (ODS), you must follow guidance for ODS users, producers and traders.
You must not use ODS in new equipment or to service existing equipment, unless they are recycled halons for critical uses. You can still use equipment that contains ODS as long as it is not leaking.
The ozone-depleting potential values in the following tables are estimates and are reviewed regularly.
Group 1
| Industrial designation | Chemical formula | Chemical name (common name) | Ozone-depleting potential |
|---|---|---|---|
| CFC-11 | CFCl3 | Trichlorofluoromethane | 1.0 |
| CFC-12 | CF2Cl2 | Dichlorodifluoromethane | 1.0 |
| CFC-113 | C2F3Cl3 | Trichlorotrifluoroethane | 0.8 |
| CFC-114 | C2F4Cl2 | Dichlorotetrafluoroethane | 1.0 |
| CFC-115 | C2F5Cl | Chloropentafluoroethane | 0.6 |
Group 2
| Industrial designation | Chemical formula | Chemical name (common name) | Ozone-depleting potential |
|---|---|---|---|
| CFC-13 | CF3Cl | Chlorotrifluoromethane | 1.0 |
| CFC-111 | C2FCl5 | Pentachlorofluoroethane | 1.0 |
| CFC-112 | C2F2Cl4 | Tetrachlorodifluoroethane | 1.0 |
| CFC-211 | C3FCl7 | Heptachlorofluoropropane | 1.0 |
| CFC-212 | C3F2Cl6 | Hexachlorodifluoropropane | 1.0 |
| CFC-213 | C3F3Cl5 | Pentachlorotrifluoropropane | 1.0 |
| CFC-214 | C3F4Cl4 | Tetrachlorotetrafluoropropane | 1.0 |
| CFC-215 | C3F5Cl3 | Trichloropentafluoropropane | 1.0 |
| CFC-216 | C3F6Cl2 | Dichlorohexafluoropropane | 1.0 |
| CFC-217 | C3F7Cl | Chloroheptafluoropropane | 1.0 |
Group 3
| Industrial designation | Chemical formula | Chemical name (common name) | Ozone-depleting potential |
|---|---|---|---|
| halon-1211 | CF2BrCl | Bromochlorodifluoromethane | 3.0 |
| halon-1301 | CF3Br | Bromotrifluoromethane | 10.0 |
| halon-2402 | C2F4Br2 | Dibromotetrafluoroethane | 6.0 |
Group 4
| Industrial designation | Chemical formula | Chemical name (common name) | Ozone-depleting potential |
|---|---|---|---|
| CTC | CCl4 | Tetrachloromethane (carbon tetrachloride) | 1.1 |
Group 5
| Industrial designation | Chemical formula | Chemical name (common name) | Ozone-depleting potential |
|---|---|---|---|
| 1,1,1-TCA | C2H3Cl3 (this formula does not refer to 1,1,2-trichloroethane) | 1,1,1-Trichloroethane (methylchloroform) | 0.1 |
Group 6
| Industrial designation | Chemical formula | Chemical name (common name) | Ozone-depleting potential |
|---|---|---|---|
| methyl bromide | CH3Br | Bromomethane | 0.6 |
Group 7
| Industrial designation | Chemical formula | Chemical name (common name) | Ozone-depleting potential |
|---|---|---|---|
| HBFC-21 B2 | CHFBr2 | Dibromofluoromethane | 1.00 |
| HBFC-22 B1 | CHF2Br | Bromodifluoromethane | 0.74 |
| HBFC-31 B1 | CH2FBr | Bromofluoromethane | 0.73 |
| HBFC-121 B4 | C2HFBr4 | Tetrabromofluoroethane | 0.8 |
| HBFC-122 B3 | C2HF2Br3 | Tribromodifluoroethane | 1.8 |
| HBFC-123 B2 | C2HF3Br2 | Dibromotrifluoroethane | 1.6 |
| HBFC-124 B1 | C2HF4Br | Bromotetrafluoroethane | 1.2 |
| HBFC-131 B3 | C2H2FBr3 | Tribromofluoroethane | 1.1 |
| HBFC-132 B2 | C2H2F2Br2 | Dibromodifluoroethane | 1.5 |
| HBFC-133 B1 | C2H2F3Br | Bromotrifluoroethane | 1.6 |
| HBFC-141 B2 | C2H3FBr2 | Dibromofluoroethane | 1.7 |
| HBFC-142 B1 | C2H3F2Br | Bromodifluoroethane | 1.1 |
| HBFC-151 B1 | C2H4FBr | Bromofluoroethane | 0.1 |
| HBFC-221 B6 | C3HFBr6 | Hexabromofluoropropane | 1.5 |
| HBFC-222 B5 | C3HF2Br5 | Pentabromodifluoropropane | 1.9 |
| HBFC-223 B4 | C3HF3Br4 | Tetrabromotrifluoropropane | 1.8 |
| HBFC-224 B3 | C3HF4Br3 | Tribromotetrafluoropropane | 2.2 |
| HBFC-225 B2 | C3HF5Br2 | Dibromopentafluoropropane | 2.0 |
| HBFC-226 B1 | C3HF6Br | Bromohexafluoropropane | 3.3 |
| HBFC-231 B5 | C3H2FBr5 | Pentabromofluoropropane | 1.9 |
| HBFC-232 B4 | C3H2F2Br4 | Tetrabromodifluoropropane | 2.1 |
| HBFC-233 B3 | C3H2F3Br3 | Tribromotrifluoropropane | 5.6 |
| HBFC-234 B2 | C3H2F4Br2 | Dibromotetrafluoropropane | 7.5 |
| HBFC-235 B1 | C3H2F5Br | Bromopentafluoropropane | 1.4 |
| HBFC-241 B4 | C3H3FBr4 | Tetrabromofluoropropane | 1.9 |
| HBFC-242 B3 | C3H3F2Br3 | Tribromodifluoropropane | 3.1 |
| HBFC-243 B2 | C3H3F3Br2 | Dibromotrifluoropropane | 2.5 |
| HBFC-244 B1 | C3H3F4Br | Bromotetrafluoropropane | 4.4 |
| HBFC-251 B1 | C3H4FBr3 | Tribromofluoropropane | 0.3 |
| HBFC-252 B2 | C3H4F2Br2 | Dibromodifluoropropane | 1.0 |
| HBFC-253 B1 | C3H4F3Br | Bromotrifluoropropane | 0.8 |
| HBFC-261 B2 | C3H5FBr2 | Dibromofluoropropane | 0.4 |
| HBFC-262 B1 | C3H5F2Br | Bromodifluoropropane | 0.8 |
| HBFC-271 B1 | C3H6FBr | Bromofluoropropane | 0.7 |
Group 8
| Industrial designation | Chemical formula | Chemical name (common name) | Ozone-depleting potential |
|---|---|---|---|
| HCFC-21* | CHFCl2 | Dichlorofluoromethane | 0.040 |
| HCFC-22* | CHF2Cl | Chlorodifluoromethane | 0.055 |
| HCFC-31 | CH2FCl | Chlorofluoromethane | 0.020 |
| HCFC-121 | C2HFCl4 | Tetrachlorofluoroethane | 0.040 |
| HCFC-122 | C2HF2Cl3 | Trichlorodifluoroethane | 0.080 |
| HCFC-123* | C2HF3Cl2 | Dichlorotrifluoroethane | 0.020 |
| HCFC-124* | C2HF4Cl | Chlorotetrafluoroethane | 0.022 |
| HCFC-131 | C2H2FCl3 | Trichlorofluoroethane | 0.050 |
| HCFC-132 | C2H2F2Cl2 | Dichlorodifluoroethane | 0.050 |
| HCFC-133 | C2H2F3Cl | Chlorotrifluoroethane | 0.060 |
| HCFC-141 | C2H3FCl2 | Dichlorofluoroethane | 0.070 |
| HCFC-141b* | CH3CFCl2 | 1,1-Dichloro-1-fluoroethane | 0.110 |
| HCFC-142 | C2H3F2Cl | Chlorodifluoroethane | 0.070 |
| HCFC-142b* | CH3CF2Cl | 1-Chloro-1,1-difluoroethane | 0.065 |
| HCFC-151 | C2H4FCl | Chlorofluoroethane | 0.005 |
| HCFC-221 | C3HFCl6 | Hexachlorofluoropropane | 0.070 |
| HCFC-222 | C3HF2Cl5 | Pentachlorodifluoropropane | 0.090 |
| HCFC-223 | C3HF3Cl4 | Tetrachlorotrifluoropropane | 0.080 |
| HCFC-224 | C3HF4Cl3 | Trichlorotetrafluoropropane | 0.090 |
| HCFC-225 | C3HF5Cl2 | Dichloropentafluoropropane | 0.070 |
| HCFC-225ca* | CF3CF2CHCl2 | 3,3-Dichloro-1,1,1,2,2-pentafluoropropane | 0.025 |
| HCFC-225cb* | CF2ClCF2CHClF | 1,3-Dichloro-1,1,2,2,3-pentafluoropropane | 0.033 |
| HCFC-226 | C3HF6Cl | Chlorohexafluoropropane | 0.100 |
| HCFC-231 | C3H2FCl5 | Pentachlorofluoropropane | 0.090 |
| HCFC-232 | C3H2F2Cl4 | Tetrachlorodifluoropropane | 0.100 |
| HCFC-233 | C3H2F3Cl3 | Trichlorotrifluoropropane | 0.230 |
| HCFC-234 | C3H2F4Cl2 | Dichlorotetrafluoropropane | 0.280 |
| HCFC-235 | C3H2F5Cl | Chloropentafluoropropane | 0.520 |
| HCFC-241 | C3H3FCl4 | Tetrachlorofluoropropane | 0.090 |
| HCFC-242 | C3H3F2Cl3 | Trichlorodifluoropropane | 0.130 |
| HCFC-243 | C3H3F3Cl2 | Dichlorotrifluoropropane | 0.120 |
| HCFC-244 | C3H3F4Cl | Chlorotetrafluoropropane | 0.140 |
| HCFC-251 | C3H4FCl3 | Trichlorofluoropropane | 0.010 |
| HCFC-252 | C3H4F2Cl2 | Dichlorodifluoropropane | 0.040 |
| HCFC-253 | C3H4F3Cl | Chlorotrifluoropropane | 0.030 |
| HCFC-261 | C3H5FCl2 | Dichlorofluoropropane | 0.020 |
| HCFC-262 | C3H5F2Cl | Chlorodifluoropropane | 0.020 |
| HCFC-271 | C3H6FCl | Chlorofluoropropane | 0.030 |
Group 9
| Industrial designation | Chemical formula | Chemical name (common name) | Ozone-depleting potential |
|---|---|---|---|
| BCM | CH2BrCl | Bromochloromethane | 0.12 |
Part A substances
You do not need to apply for a licence, apply for quota or report on this substance.
| Chemical formula | Chemical name (common name) | Ozone-depleting potential |
|---|---|---|
| CBr2 F2 | Dibromodifluoromethane (halon-1202) | 1.25 |
Part B substances
These ODS are not banned or covered by licensing or quotas but you must report on imports and exports.
| Chemical formula | Chemical name (common name) | Ozone-depleting potential |
|---|---|---|
| C3H7Br | 1-Bromopropane (n-propyl bromide) | 0.02 to 0.10 |
| C2H5Br | Bromoethane (ethyl bromide) | 0.02 to 0.10 |
| CF3I | Trifluoroiodomethane (trifluoromethyl iodide) | 0.01 to 0.02 |
| CH3Cl | Chloromethane (methyl chloride) | 0.02 |
Updates to this page
Published 7 February 2019Last updated 6 February 2024 + show all updates
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Clarified that all groups of ODS cannot be used in new equipment and to service existing equipment, unless they are recycled halons for critical use.
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Added tables of ODS with restrictions.
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First published.