The Montreal Protocol on Substances that Deplete the Ozone Layer

Annex C: Controlled substances

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Group Substance Number of isomers Ozone-Depleting Potential*
Group I
CHFCl2 (HCFC‑21)** 1 0.04
CHF2Cl (HCFC‑22)** 1 0.055
CH2FCl (HCFC‑31) 1 0.02
C2HFCl4 (HCFC‑121) 2 0.01-0.04
C2HF2Cl3 (HCFC‑122) 3 0.02-0.08
C2HF3Cl2 (HCFC‑123) 3 0.02-0.06
CHCl2CF3 (HCFC‑123)** - 0.02
C2HF4Cl (HCFC‑124) 2 0.02-0.04
CHFClCF3 (HCFC‑124)** - 0.022
C2H2FCl3 (HCFC‑131) 3 0.007-0.05
C2H2F2Cl2 (HCFC‑132) 4 0.008-0.05
C2H2F3Cl (HCFC‑133) 3 0.02-0.06
C2H3FCl2 (HCFC‑141) 3 0.005-0.07
CH3CFCl2 (HCFC‑141b)** - 0.11
C2H3F2Cl (HCFC‑142) 3 0.008-0.07
CH3CF2Cl (HCFC‑142b)** - 0.065
C2H4FCl (HCFC‑151) 2 0.003-0.005
C3HFCl6 (HCFC‑221) 5 0.015-0.07
C3HF2Cl5 (HCFC‑222) 9 0.01-0.09
C3HF3Cl4 (HCFC‑223) 12 0.01-0.08
C3HF4Cl3 (HCFC‑224) 12 0.01-0.09
C3HF5Cl2 (HCFC‑225) 9 0.02-0.07
CF3CF2CHCl2 (HCFC‑225ca)** - 0.025
CF2ClCF2CHClF (HCFC‑225cb)** - 0.033
C3HF6Cl (HCFC‑226) 5 0.02-0.10
C3H2FCl5 (HCFC‑231) 9 0.05-0.09
C3H2F2Cl4 (HCFC‑232) 16 0.008-0.10
C3H2F3Cl3 (HCFC‑233) 18 0.007-0.23
C3H2F4Cl2 (HCFC‑234) 16 0.01-0.28
C3H2F5Cl (HCFC‑235) 9 0.03-0.52
C3H3FCl4 (HCFC‑241) 12 0.004-0.09
C3H3F2Cl3 (HCFC‑242) 18 0.005-0.13
C3H3F3Cl2 (HCFC‑243) 18 0.007-0.12
C3H3F4Cl (HCFC‑244) 12 0.009-0.14
C3H4FCl3 (HCFC‑251) 12 0.001-0.01
C3H4F2Cl2 (HCFC‑252) 16 0.005-0.04
C3H4F3Cl (HCFC‑253) 12 0.003-0.03
C3H5FCl2 (HCFC‑261) 9 0.002-0.02
C3H5F2Cl (HCFC‑262) 9 0.002-0.02
C3H6FCl (HCFC‑271) 5 0.001-0.03
Group Substance Number of isomers Ozone-Depleting Potential*
Group II
CHFBr2 1 1.00
CHF2Br (HBFC-22B1) 1 0.74
CH2FBr 1 0.73
C2HFBr4 2 0.3-0.8
C2HF2Br3 3 0.5-1.8
C2HF3Br2 3 0.4-1.6
C2HF4Br 2 0.7-1.2
C2H2FBr3 3 0.1-1.1
C2H2F2Br2 4 0.2-1.5
C2H2F3Br 3 0.7-1.6
C2H3FBr2 3 0.1-1.7
C2H3F2Br 3 0.2-1.1
C2H4FBr 2 0.07-0.1
C3HFBr6 5 0.3-1.5
C3HF2Br5 9 0.2-1.9
C3HF3Br4 12 0.3-1.8
C3HF4Br3 12 0.5-2.2
C3HF5Br2 9 0.9-2.0
C3HF6Br 5 0.7-3.3
C3H2FBr5 9 0.1-1.9
C3H2F2Br4 16 0.2-2.1
C3H2F3Br3 18 0.2-5.6
C3H2F4Br2 16 0.3-7.5
C3H2F5Br 8 0.9-1.4
C3H3FBr4 12 0.08-1.9
C3H3F2Br3 18 0.1-3.1
C3H3F3Br2 18 0.1-2.5
C3H3F4Br 12 0.3-4.4
C3H4FBr3 12 0.03-0.3
C3H4F2Br2 16 0.1-1.0
C3H4F3Br 12 0.07-0.8
C3H5FBr2 9 0.04-0.4
C3H5F2Br 9 0.07-0.8
C3H6FBr 5 0.02-0.7
Group III
CH2BrCl bromochloromethane 1 0.12

* 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 a 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.

** Identifies the most commercially viable substances with ODP values listed against them to be used for the purposes of the Protocol.



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