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 Code of Federal Regulations (Last Updated: May 6, 2024)
 Title 40 - Protection of Environment
 Chapter I - Environmental Protection Agency
 SubChapter C - Air Programs
 Part 82 - Protection of Stratospheric Ozone
 Subpart A - Production and Consumption Controls

  Appendix B to Subpart A of Part 82 - Class II Controlled Substances a b  

Latest version.
  • Controlled substance ODP
    1. HCFC-21 (CHFCl2) Dichlorofluoromethane0.04
    2. HCFC-22 (CHF2Cl) Monochlorodifluoromethane0.055
    3. HCFC-31 (CH2FCl) Monochlorofluoromethane0.02
    4. HCFC-121 (C2HFCl4) Tetrachlorofluoroethane0.01-0.04
    5. HCFC-122 (C2HF2Cl3) Trichlorodifluoroethane0.02-0.08
    6. HCFC-123 (C2HF3Cl2) Dichlorotrifluoroethane0.02
    7. HCFC-124 (C2HF4Cl) Monochlorotetrafluoroethane0.022
    8. HCFC-131 (C2H2FCl3) Trichlorofluoroethane0.007-0.05
    9. HCFC-132 (C2H2F2Cl2) Dichlorodifluoroethane0.008-0.05
    10. HCFC-133 (C2H2F3Cl) Monochlorotrifluoroethane0.02-0.06
    11. HCFC-141 (C2H3FCl2) Dichlorofluoroethane0.005-0.07
    12. HCFC-141b (CH3CFCl2) Dichlorofluoroethane0.11
    13. HCFC-142 (C2H3F2Cl) Chlorodifluoroethane0.008-0.07
    14. HCFC-142b (CH3CF2Cl) Monochlorodifluoroethane0.065
    15. HCFC-151 (C2H4FCl) Chlorofluoroethane0.003-0.005
    16. HCFC-221 (C3HFCl6) Hexachlorofluoropropane0.015-0.07
    17. HCFC-222 (C3HF2Cl5) Pentachlorodifluoropropane0.01-0.09
    18. HCFC-223 (C3HF3Cl4) Tetrachlorotrifluoropropane0.01-0.08
    19. HCFC-224 (C3HF4Cl3) Trichlorotetrafluoropropane0.01-0.09
    20. HCFC-225 (C3HF5Cl2) Dichloropentafluoropropane0.02-0.07
    21. HCFC-225ca (CF3CF2CHCl2) Dichloropentafluoropropane0.025
    22. HCFC-225cb (CF2ClCF2CHClF) Dichloropentafluoropropane0.033
    23. HCFC-226 (C3HF6Cl) Monochlorohexafluoropropane0.02-0.1
    24. HCFC-231 (C3H2FCl5) Pentachlorofluoropropane0.05-0.09
    25. HCFC-232 (C3H2F2Cl4) Tetrachlorodifluoropropane0.008-0.1
    26. HCFC-233 (C3H2F3Cl3) Trichlorotrifluoropropane0.007-0.23
    27. HCFC-234 (C3H2F4Cl2) Dichlorotetrafluoropropane0.01-0.28
    28. HCFC-235 (C3H2F5Cl) Monochloropentafluoropropane0.03-0.52
    29. HCFC-241 (C3H3FCl4) Tetrachlorofluoropropane0.004-0.09
    30. HCFC-242 (C3H3F2Cl3) Trichlorodifluoropropane0.005-0.13
    31. HCFC-243 (C3H3F3Cl2) Dichlorotrifluoropropane0.007-0.12
    32. HCFC-244 (C3H3F4Cl) Monochlorotetrafluoropropane0.009-0.14
    33. HCFC-251 (C3H4FCl3) Monochlorotetrafluoropropane0.001-0.01
    34. HCFC-252 (C3H4F2Cl2) Dichlorodifluoropropane0.005-0.04
    35. HCFC-253 (C3H4F3Cl) Monochlorotrifluoropropane0.003-0.03
    36. HCFC-261 (C3H5FCl2) Dichlorofluoropropane0.002-0.02
    37. HCFC-262 (C3H5F2Cl) Monochlorodifluoropropane0.002-0.02
    38. HCFC-271 (C3H6FCl) Monochlorofluoropropane0.001-0.03

    a According to Annex C of the Montreal Protocol, “Where a range of ODPs is indicated, the highest value in that range shall be used for the purposes of the Protocol. The ODPs listed as single value have been determined from calculations based on laboratory measurements. Those listed as a range are based on estimates and are less certain. The range pertains to an isomeric group. The upper value is the estimate of the ODP of the isomer with the highest ODP, and the lower value is the estimate of the ODP of the isomer with the lowest ODP.

    b This table includes all isomers of the substances above, regardless of whether the isomer is explicitly listed on its own.