عربي 中文 English Français Русский Español
عربي 中文 English Français Русский Español

The Montreal Protocol on Substances that Deplete the Ozone Layer

Annex A: Controlled substances

Group Substance Ozone-Depleting Potential*
Group I
CFCl3 (CFC‑11) 1.0
CF2Cl2 (CFC‑12) 1.0
C2F3Cl3 (CFC‑113) 0.8
C2F4Cl2 (CFC‑114) 1.0
C2F5Cl (CFC‑115) 0.6
Group II
CF2BrCl (halon‑1211) 3.0
CF3Br (halon‑1301) 10.0
C2F4Br2 (halon‑2402) 6.0

* These ozone depleting potentials are estimates based on existing knowledge and will be reviewed and revised periodically.

Annex B: Controlled substances

Group Substance Ozone-Depleting Potential
Group I
CF3Cl (CFC‑13) 1.0
C2FCl5 (CFC‑111) 1.0
C2F2Cl4 (CFC‑112) 1.0
C3FCl7 (CFC‑211) 1.0
C3F2Cl6 (CFC‑212) 1.0
C3F3Cl5 (CFC‑213) 1.0
C3F4Cl4 (CFC‑214) 1.0
C3F5Cl3 (CFC‑215) 1.0
C3F6Cl2 (CFC‑216) 1.0
C3F7Cl (CFC‑217) 1.0
Group II
CCl4 carbon tetrachloride 1.1
Group III
C2H3Cl3* 1,1,1-trichloroethane* (methyl chloroform) 0.1

* This formula does not refer to 1,1,2-trichloroethane.

Annex C: Controlled substances

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.

Annex D:* A list of products** containing controlled substances specified in Annex A

Products Customs code number
1. Automobile and truck air conditioning units (whether incorporated in vehicles or not) ...................
2. Domestic and commercial refrigeration and air conditioning/heat pump equipment*** ...................
e.g. Refrigerators ...................
Freezers ...................
Dehumidifiers ...................
Water coolers ...................
Ice machines ...................
Air conditioning and heat pump units ...................
3. Aerosol products, except medical aerosols ...................
4. Portable fire extinguisher ...................
5. Insulation boards, panels and pipe covers ...................
6. Pre-polymers ...................

* This Annex was adopted by the Third Meeting of the Parties in Nairobi, 21 June 1991 as required by paragraph 3 of Article 4 of the Protocol.

** Though not when transported in consignments of personal or household effects or in similar non-commercial situations normally exempted from customs attention.

*** When containing controlled substances in Annex A as a refrigerant and/or in insulating material of the product.

Annex E: Controlled substance

Group Substance Ozone-Depleting Potential
Group I
CH3Br methyl bromide 0.6


عربي 中文 English Français Русский Español