Code of Federal Regulations > Title 40 > Chapter I > Part 98 > Subpart A > Appendix - Table A-1 to Subpart A of Part 98

Regulations last checked for updates: Nov 25, 2024

Title 40 - Protection of Environment last revised: Nov 21, 2024

Appendix - Table A-1 to Subpart A of Part 98—Global Warming Potentials

Link to an amendment published at 89 FR 31894, Apr. 25, 2024.

[100-Year Time Horizon]

Name	CAS No.	Chemical formula	Global warming potential (100 yr.)
Chemical-Specific GWPs
Carbon dioxide	124-38-9	CO2	1
Methane	74-82-8	CH4	^a 25
Nitrous oxide	10024-97-2	N2O	^a 298
Fully Fluorinated GHGs
Sulfur hexafluoride	2551-62-4	SF6	^a 22,800
Trifluoromethyl sulphur pentafluoride	373-80-8	SF5CF3	17,700
Nitrogen trifluoride	7783-54-2	NF3	17,200
PFC-14 (Perfluoromethane)	75-73-0	CF4	^a 7,390
PFC-116 (Perfluoroethane)	76-16-4	C2F6	^a 12,200
PFC-218 (Perfluoropropane)	76-19-7	C3F8	^a 8,830
Perfluorocyclopropane	931-91-9	C-C3F6	17,340
PFC-3-1-10 (Perfluorobutane)	355-25-9	C4F10	^a 8,860
PFC-318 (Perfluorocyclobutane)	115-25-3	C-C4F8	^a 10,300
PFC-4-1-12 (Perfluoropentane)	678-26-2	C5F12	^a 9,160
PFC-5-1-14 (Perfluorohexane, FC-72)	355-42-0	C6F14	^a 9,300
PFC-6-1-12	335-57-9	C7F16; CF3(CF2)5CF3	^b 7,820
PFC-7-1-18	307-34-6	C8F18; CF3(CF2)6CF3	^b 7,620
PFC-9-1-18	306-94-5	C10F18	7,500
PFPMIE (HT-70)	NA	CF3OCF(CF3)CF2OCF2OCF3	10,300
Perfluorodecalin (cis)	60433-11-6	Z-C10F18	^b 7,236
Perfluorodecalin (trans)	60433-12-7	E-C10F18	^b 6,288
Saturated Hydrofluorocarbons (HFCs) With Two or Fewer Carbon-Hydrogen Bonds
HFC-23	75-46-7	CHF3	^a 14,800
HFC-32	75-10-5	CH2F2	^a 675
HFC-125	354-33-6	C2HF5	^a 3,500
HFC-134	359-35-3	C2H2F4	^a 1,100
HFC-134a	811-97-2	CH2FCF3	^a 1,430
HFC-227ca	2252-84-8	CF3CF2CHF2	^b 2640
HFC-227ea	431-89-0	C3HF7	^a 3,220
HFC-236cb	677-56-5	CH2FCF2CF3	1,340
HFC-236ea	431-63-0	CHF2CHFCF3	1,370
HFC-236fa	690-39-1	C3H2F6	^a 9,810
HFC-329p	375-17-7	CHF2CF2CF2CF3	^b 2360
HFC-43-10mee	138495-42-8	CF3CFHCFHCF2CF3	^a 1,640
Saturated Hydrofluorocarbons (HFCs) With Three or More Carbon-Hydrogen Bonds
HFC-41	593-53-3	CH3F	^a 92
HFC-143	430-66-0	C2H3F3	^a 353
HFC-143a	420-46-2	C2H3F3	^a 4,470
HFC-152	624-72-6	CH2FCH2F	53
HFC-152a	75-37-6	CH3CHF2	^a 124
HFC-161	353-36-6	CH3CH2F	12
HFC-245ca	679-86-7	C3H3F5	^a 693
HFC-245cb	1814-88-6	CF3CF2CH3	^b 4620
HFC-245ea	24270-66-4	CHF2CHFCHF2	^b 235
HFC-245eb	431-31-2	CH2FCHFCF3	^b 290
HFC-245fa	460-73-1	CHF2CH2CF3	1,030
HFC-263fb	421-07-8	CH3CH2CF3	^b 76
HFC-272ca	420-45-1	CH3CF2CH3	^b 144
HFC-365mfc	406-58-6	CH3CF2CH2CF3	794
Saturated Hydrofluoroethers (HFEs) and Hydrochlorofluoroethers (HCFEs) With One Carbon-Hydrogen Bond
HFE-125	3822-68-2	CHF2OCF3	14,900
HFE-227ea	2356-62-9	CF3CHFOCF3	1,540
HFE-329mcc2	134769-21-4	CF3CF2OCF2CHF2	919
HFE-329me3	428454-68-6	CF3CFHCF2OCF3	^b 4,550
1,1,1,2,2,3,3-Heptafluoro-3-(1,2,2,2-tetrafluoroethoxy)-propane	3330-15-2	CF3CF2CF2OCHFCF3	^b 6,490
Saturated HFEs and HCFEs With Two Carbon-Hydrogen Bonds
HFE-134 (HG-00)	1691-17-4	CHF2OCHF2	6,320
HFE-236ca	32778-11-3	CHF2OCF2CHF2	^b 4,240
HFE-236ca12 (HG-10)	78522-47-1	CHF2OCF2OCHF2	2,800
HFE-236ea2 (Desflurane)	57041-67-5	CHF2OCHFCF3	989
HFE-236fa	20193-67-3	CF3CH2OCF3	487
HFE-338mcf2	156053-88-2	CF3CF2OCH2CF3	552
HFE-338mmz1	26103-08-2	CHF2OCH(CF3)2	380
HFE-338pcc13 (HG-01)	188690-78-0	CHF2OCF2CF2OCHF2	1,500
HFE-43-10pccc (H-Galden 1040x, HG-11)	E1730133	CHF2OCF2OC2F4OCHF2	1,870
HCFE-235ca2 (Enflurane)	13838-16-9	CHF2OCF2CHFCl	^b 583
HCFE-235da2 (Isoflurane)	26675-46-7	CHF2OCHClCF3	350
HG-02	205367-61-9	HF2C-(OCF2CF2)2-OCF2H	^b 3,825
HG-03	173350-37-3	HF2C-(OCF2CF2)3-OCF2H	^b 3,670
HG-20	249932-25-0	HF2C-(OCF2)2-OCF2H	^b 5,300
HG-21	249932-26-1	HF2C-OCF2CF2OCF2OCF2O-CF2H	^b 3,890
HG-30	188690-77-9	HF2C-(OCF2)3-OCF2H	^b 7,330
1,1,3,3,4,4,6,6,7,7,9,9,10,10,12,12,13,13,15,15-eicosafluoro-2,5,8,11,14-Pentaoxapentadecane	173350-38-4	HCF2O(CF2CF2O)4CF2H	^b 3,630
1,1,2-Trifluoro-2-(trifluoromethoxy)-ethane	84011-06-3	CHF2CHFOCF3	^b 1,240
Trifluoro(fluoromethoxy)methane	2261-01-0	CH2FOCF3	^b 751
Saturated HFEs and HCFEs With Three or More Carbon-Hydrogen Bonds
HFE-143a	421-14-7	CH3OCF3	756
HFE-245cb2	22410-44-2	CH3OCF2CF3	708
HFE-245fa1	84011-15-4	CHF2CH2OCF3	286
HFE-245fa2	1885-48-9	CHF2OCH2CF3	659
HFE-254cb2	425-88-7	CH3OCF2CHF2	359
HFE-263fb2	460-43-5	CF3CH2OCH3	11
HFE-263m1; R-E-143a	690-22-2	CF3OCH2CH3	^b 29
HFE-347mcc3 (HFE-7000)	375-03-1	CH3OCF2CF2CF3	575
HFE-347mcf2	171182-95-9	CF3CF2OCH2CHF2	374
HFE-347mmy1	22052-84-2	CH3OCF(CF3)2	343
HFE-347mmz1 (Sevoflurane)	28523-86-6	(CF3)2CHOCH2F	^c 216
HFE-347pcf2	406-78-0	CHF2CF2OCH2CF3	580
HFE-356mec3	382-34-3	CH3OCF2CHFCF3	101
HFE-356mff2	333-36-8	CF3CH2OCH2CF3	^b 17
HFE-356mmz1	13171-18-1	(CF3)2CHOCH3	27
HFE-356pcc3	160620-20-2	CH3OCF2CF2CHF2	110
HFE-356pcf2	50807-77-7	CHF2CH2OCF2CHF2	265
HFE-356pcf3	35042-99-0	CHF2OCH2CF2CHF2	502
HFE-365mcf2	22052-81-9	CF3CF2OCH2CH3	^b 58
HFE-365mcf3	378-16-5	CF3CF2CH2OCH3	11
HFE-374pc2	512-51-6	CH3CH2OCF2CHF2	557
HFE-449s1 (HFE-7100) Chemical blend	163702-07-6	C4F9OCH3	297
	163702-08-7	(CF3)2CFCF2OCH3
HFE-569sf2 (HFE-7200) Chemical blend	163702-05-4	C4F9OC2H5	59
	163702-06-5	(CF3)2CFCF2OC2H5
HG'-01	73287-23-7	CH3OCF2CF2OCH3	^b 222
HG'-02	485399-46-0	CH3O(CF2CF2O)2CH3	^b 236
HG'-03	485399-48-2	CH3O(CF2CF2O)3CH3	^b 221
Difluoro(methoxy)methane	359-15-9	CH3OCHF2	^b 144
2-Chloro-1,1,2-trifluoro-1-methoxyethane	425-87-6	CH3OCF2CHFCl	^b 122
1-Ethoxy-1,1,2,2,3,3,3-heptafluoropropane	22052-86-4	CF3CF2CF2OCH2CH3	^b 61
2-Ethoxy-3,3,4,4,5-pentafluorotetrahydro-2,5-bis[1,2,2,2-tetrafluoro-1-(trifluoromethyl)ethyl]-furan	920979-28-8	C12H5F19O2	^b 56
1-Ethoxy-1,1,2,3,3,3-hexafluoropropane	380-34-7	CF3CHFCF2OCH2CH3	^b 23
Fluoro(methoxy)methane	460-22-0	CH3OCH2F	^b 13
1,1,2,2-Tetrafluoro-3-methoxy-propane; Methyl 2,2,3,3-tetrafluoropropyl ether	60598-17-6	CHF2CF2CH2OCH3	^b 0.5
1,1,2,2-Tetrafluoro-1-(fluoromethoxy)ethane	37031-31-5	CH2FOCF2CF2H	^b 871
Difluoro(fluoromethoxy)methane	461-63-2	CH2FOCHF2	^b 617
Fluoro(fluoromethoxy)methane	462-51-1	CH2FOCH2F	^b 130
Fluorinated Formates
Trifluoromethyl formate	85358-65-2	HCOOCF3	^b 588
Perfluoroethyl formate	313064-40-3	HCOOCF2CF3	^b 580
1,2,2,2-Tetrafluoroethyl formate	481631-19-0	HCOOCHFCF3	^b 470
Perfluorobutyl formate	197218-56-7	HCOOCF2CF2CF2CF3	^b 392
Perfluoropropyl formate	271257-42-2	HCOOCF2CF2CF3	^b 376
1,1,1,3,3,3-Hexafluoropropan-2-yl formate	856766-70-6	HCOOCH(CF3)2	^b 333
2,2,2-Trifluoroethyl formate	32042-38-9	HCOOCH2CF3	^b 33
3,3,3-Trifluoropropyl formate	1344118-09-7	HCOOCH2CH2CF3	^b 17
Fluorinated Acetates
Methyl 2,2,2-trifluoroacetate	431-47-0	CF3COOCH3	^b 52
1,1-Difluoroethyl 2,2,2-trifluoroacetate	1344118-13-3	CF3COOCF2CH3	^b 31
Difluoromethyl 2,2,2-trifluoroacetate	2024-86-4	CF3COOCHF2	^b 27
2,2,2-Trifluoroethyl 2,2,2-trifluoroacetate	407-38-5	CF3COOCH2CF3	^b 7
Methyl 2,2-difluoroacetate	433-53-4	HCF2COOCH3	^b 3
Perfluoroethyl acetate	343269-97-6	CH3COOCF2CF3	^b 2.1
Trifluoromethyl acetate	74123-20-9	CH3COOCF3	^b 2.0
Perfluoropropyl acetate	1344118-10-0	CH3COOCF2CF2CF3	^b 1.8
Perfluorobutyl acetate	209597-28-4	CH3COOCF2CF2CF2CF3	^b 1.6
Ethyl 2,2,2-trifluoroacetate	383-63-1	CF3COOCH2CH3	^b 1.3
Carbonofluoridates
Methyl carbonofluoridate	1538-06-3	FCOOCH3	^b 95
1,1-Difluoroethyl carbonofluoridate	1344118-11-1	FCOOCF2CH3	^b 27
Fluorinated Alcohols Other Than Fluorotelomer Alcohols
Bis(trifluoromethyl)-methanol	920-66-1	(CF3)2CHOH	195
(Octafluorotetramethy-lene) hydroxymethyl group	NA	X-(CF2)4CH(OH)-X	73
2,2,3,3,3-Pentafluoropropanol	422-05-9	CF3CF2CH2OH	42
2,2,3,3,4,4,4-Heptafluorobutan-1-ol	375-01-9	C3F7CH2OH	^b 25
2,2,2-Trifluoroethanol	75-89-8	CF3CH2OH	^b 20
2,2,3,4,4,4-Hexafluoro-1-butanol	382-31-0	CF3CHFCF2CH2OH	^b 17
2,2,3,3-Tetrafluoro-1-propanol	76-37-9	CHF2CF2CH2OH	^b 13
2,2-Difluoroethanol	359-13-7	CHF2CH2OH	^b 3
2-Fluoroethanol	371-62-0	CH2FCH2OH	^b 1.1
4,4,4-Trifluorobutan-1-ol	461-18-7	CF3(CH2)2CH2OH	^b 0.05
Unsaturated Perfluorocarbons (PFCs)
PFC-1114; TFE	116-14-3	CF2 = CF2; C2F4	^b 0.004
PFC-1216; Dyneon HFP	116-15-4	C3F6; CF3CF = CF2	^b 0.05
PFC C-1418	559-40-0	c-C5F8	^b 1.97
Perfluorobut-2-ene	360-89-4	CF3CF = CFCF3	^b 1.82
Perfluorobut-1-ene	357-26-6	CF3CF2CF = CF2	^b 0.10
Perfluorobuta-1,3-diene	685-63-2	CF2 = CFCF = CF2	^b 0.003
Unsaturated Hydrofluorocarbons (HFCs) and Hydrochlorofluorocarbons (HCFCs)
HFC-1132a; VF2	75-38-7	C2H2F2 , CF2 = CH2	^b 0.04
HFC-1141; VF	75-02-5	C2H3F, CH2 = CHF	^b 0.02
(E)-HFC-1225ye	5595-10-8	CF3CF = CHF(E)	^b 0.06
(Z)-HFC-1225ye	5528-43-8	CF3CF = CHF(Z)	^b 0.22
Solstice 1233zd(E)	102687-65-0	C3H2ClF3; CHCl = CHCF3	^b 1.34
HFC-1234yf; HFO-1234yf	754-12-1	C3H2F4; CF3CF = CH2	^b 0.31
HFC-1234ze(E)	1645-83-6	C3H2F4; trans-CF3CH = CHF	^b 0.97
HFC-1234ze(Z)	29118-25-0	C3H2F4; cis-CF3CH = CHF; CF3CH = CHF	^b 0.29
HFC-1243zf; TFP	677-21-4	C3H3F3, CF3CH = CH2	^b 0.12
(Z)-HFC-1336	692-49-9	CF3CH = CHCF3(Z)	^b 1.58
HFC-1345zfc	374-27-6	C2F5CH = CH2	^b 0.09
Capstone 42-U	19430-93-4	C6H3F9, CF3(CF2)3CH = CH2	^b 0.16
Capstone 62-U	25291-17-2	C8H3F13, CF3(CF2)5CH = CH2	^b 0.11
Capstone 82-U	21652-58-4	C10H3F17, CF3(CF2)7CH = CH2	^b 0.09
Unsaturated Halogenated Ethers
PMVE; HFE-216	1187-93-5	CF3OCF = CF2	^b 0.17
Fluoroxene	406-90-6	CF3CH2OCH = CH2	^b 0.05
Fluorinated Aldehydes
3,3,3-Trifluoro-propanal	460-40-2	CF3CH2CHO	^b 0.01
Fluorinated Ketones
Novec 1230 (perfluoro (2-methyl-3-pentanone))	756-13-8	CF3CF2C(O)CF (CF3)2	^b 0.1
Fluorotelomer Alcohols
3,3,4,4,5,5,6,6,7,7,7-Undecafluoroheptan-1-ol	185689-57-0	CF3(CF2)4CH2CH2OH	^b 0.43
3,3,3-Trifluoropropan-1-ol	2240-88-2	CF3CH2CH2OH	^b 0.35
3,3,4,4,5,5,6,6,7,7,8,8,9,9,9-Pentadecafluorononan-1-ol	755-02-2	CF3(CF2)6CH2CH2OH	^b 0.33
3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,11-Nonadecafluoroundecan-1-ol	87017-97-8	CF3(CF2)8CH2CH2OH	^b 0.19
Fluorinated GHGs With Carbon-Iodine Bond(s)
Trifluoroiodomethane	2314-97-8	CF3I	^b 0.4
Other Fluorinated Compounds
Dibromodifluoromethane (Halon 1202)	75-61-6	CBR2F2	^b 231
2-Bromo-2-chloro-1,1,1-trifluoroethane (Halon-2311/Halothane)	151-67-7	CHBrClCF3	^b 41

Fluorinated GHG Group ^d	Global warming potential (100 yr.)
Default GWPs for Compounds for Which Chemical-Specific GWPs Are Not Listed Above
Fully fluorinated GHGs	10,000
Saturated hydrofluorocarbons (HFCs) with 2 or fewer carbon-hydrogen bonds	3,700
Saturated HFCs with 3 or more carbon-hydrogen bonds	930
Saturated hydrofluoroethers (HFEs) and hydrochlorofluoroethers (HCFEs) with 1 carbon-hydrogen bond	5,700
Saturated HFEs and HCFEs with 2 carbon-hydrogen bonds	2,600
Saturated HFEs and HCFEs with 3 or more carbon-hydrogen bonds	270
Fluorinated formates	350
Fluorinated acetates, carbonofluoridates, and fluorinated alcohols other than fluorotelomer alcohols	30
Unsaturated perfluorocarbons (PFCs), unsaturated HFCs, unsaturated hydrochlorofluorocarbons (HCFCs), unsaturated halogenated ethers, unsaturated halogenated esters, fluorinated aldehydes, and fluorinated ketones	1
Fluorotelomer alcohols	1
Fluorinated GHGs with carbon-iodine bond(s)	1
Other fluorinated GHGs	2,000

^a The GWP for this compound was updated in the final rule published on November 29, 2013 [78 FR 71904] and effective on January 1, 2014.

^b This compound was added to Table A-1 in the final rule published on December 11, 2014, and effective on January 1, 2015.

^c The GWP for this compound was updated in the final rule published on December 11, 2014, and effective on January 1, 2015 .

^d For electronics manufacturing (as defined in § 98.90), the term “fluorinated GHGs” in the definition of each fluorinated GHG group in § 98.6 shall include fluorinated heat transfer fluids (as defined in § 98.98), whether or not they are also fluorinated GHGs.

[79 FR 73779, Dec. 11, 2014]

authority: 42 U.S.C. 7401-7671q.

source: 74 FR 56374, Oct. 30, 2009, unless otherwise noted.