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Global Warming Potentials of ODS Substitutes

The global warming potential (GWP) represents how much a given mass of a chemical contributes to global warming over a given time period compared to the same mass of carbon dioxide. Carbon dioxide's GWP is defined as 1.0.

Why are there three values given for the GWP and atmospheric lifetime?

All GWP values represent global warming potential over a 100-year time horizon. Dashes indicate that the source did not include a GWP value for the given compound. The first value in each of the second and third columns is from Table 1-6 of the Scientific Assessment of Ozone Depletion, 2002. The second and third values in each of these columns are from the Intergovernmental Panel on Climate Change (IPCC Exit EPA disclaimer) Second Assessment Report: Climate Change 1995 and the IPCC Third Assessment Report: Climate Change 2001, respectively.

For more specific information on how many of these chemicals are used as substitutes for ozone-depleting substances, please visit the SNAP Program's web site.

The HFCs are numbered according to the ASHRAE Standard 34 scheme. None of the chemicals listed below depletes the ozone layer. GWP values for ozone-depleting substances are available in another table.

HFCs and PFCs

Chemical Atmospheric
Lifetime (years)
GWP Use
HFC-23
(CHF3)
270
264
260
12,240
11,700
12,000
Byproduct of HCFC-22 used in very-low temperature refrigeration blend and component in fire suppression. Also used for plasma etching and cleaning in semiconductor production.
HFC-32
(CH2F2)
4.9
5.6
5.0
543
650
550
Blend component of numerous refrigerants.
HFC-41
(CH3F)
2.4
3.7
2.6
90
150
97
Not in use today.
HFC-43-10mee
(C5H2F10)
15.9
17.1
15
1,610
1,300
1,500
Cleaning solvent
HFC-125
(C2HF5)
29
32.6
29
3,450
2,800
3,400
Blend component of numerous refrigerants and a fire suppressant.
HFC-134
(CHF2CHF2)
9.6
10.6
9.6
1,090
1,000
1,100
Not in use today.
HFC-134a
(CH2FCF3)
14
14.6
13.8
1,320
1,300
1,300
One of the most widely used refrigerant blends, component of other refrigerants, foam blowing agent, fire suppressant and propellant in metered-dose inhalers and aerosols.
HFC-143
(C2H3F3)
3.5
3.8
3.4
347
300
330
Not in use today.
HFC-143a
(C2H3F3)
52
48.3
52
4,400
3,800
4,300
Blend component of several
refrigerant blends.
HFC-152a
(C2H4F2)
1.4
1.5
1.4
122
140
120
Blend component of several refrigerant blends and foam blowing agent. Also used as an aerosol propellant.
HFC-227ea
(C3HF7)
34.2
36.5
33.0
3,660
2,900
3,500
Fire suppressant and propellant for metered-dose inhalers, and refrigerant.
HFC-236fa
(C3H2F6)
240
209
220
9,650
6,300
9,400
Refrigerant and fire suppressant.
HFC-236ea
(C3H2F6)
10.7
--
10.0
1,350
--
1,200
Not in use today.
HFC-245ca
(C3H3F5)
6.2
6.6
5.9
682
560
640
Not in use today; possible refrigerant in the future.
HFC-245fa
(C3H3F5)
7.6
--
7.2
1,020
--
950
Foam blowing agent and
possible refrigerant in the future.
HFC-365mfc
(C4H5F5)
8.6
--
9.9
782
--
950
Some use as a foam blowing
agent; possible refrigerant in the future.
Perfluoromethane
(CF4)
50,000
50,000
50,000
5,820
6,500
5,700
Plasma etching and cleaning in semiconductor production and low temperature refrigerant.
Perfluoroethane
(C2F6)
10,000
10,000
10,000
12,010
9,200
11,900
Plasma etching and cleaning in semiconductor production.
Perfluoropropane
(C3F8)
2,600
2,600
2,600
8,690
7,000
8,600
Plasma etching and cleaning in semiconductor production, low temperature refrigerant and fire suppressant.
Perfluorobutane
(C4F10)
2,600
2,600
2,600
8,710
7,000
8,600
Fire suppressant and refrigerant where no other alternatives are technically feasible.
Perfluorocyclobutane
(C4F8)
3,200
3,200
3,200
10,090
8,700
10,000
Not used much if any. Refrigerant where no other alternatives are technically feasible.
Perfluoropentane
(C5F12)
4,100
4,100
4,100
9,010
7,500
8,900
Not used much if any. Precision cleaning solvent-low use refrigerant where no other alternatives are technically feasible.
Perfluorohexane
(C6F14)
3,200
3,200
3,200
9,140
7,400
9,000
Precision cleaning solvent-low use, refrigerant and fire suppressant where no other alternatives are technically feasible.

NF3

Chemical Atmospheric
Lifetime (years)
GWP Use
NF3 740
--
--
10,970
--
--
Plasma etching and cleaning in semiconductor production.

SF6

Chemical Atmospheric
Lifetime (years)
GWP Use
Sulfur hexafluoride
(SF6)
3,200
3,200
3,200
22,450
23,900
22,200
Cover gas in magnesium production, casting dielectric gas and insulator in electric power equipment fire suppression. Also used as a discharge agent in military systems and formerly an aerosol propellant.

HFEs

Chemical Atmospheric
Lifetime (years)
GWP Use
HFE-7100
(C4F9OCH3)
5.0
--
5.0
397
--
390
Cleaning solvent and heat transfer fluid.
HFE-7200
(C4F9OC2H5)
0.77
--
0.77
56
--
55
Cleaning solvent and heat transfer fluid.

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