The Montreal Protocol on Substances that Deplete the Ozone Layer

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Annex A: Controlled substances

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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

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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

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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.

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

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	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

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