{"data":{"id":"us/40-cfr-84.64","jurisdiction":"us","citation":"40 CFR 84.64","heading":"Global warming potentials.","body":"(a) The global warming potential of a regulated substance is the exchange value for the regulated substance listed in subsection (c) of the AIM Act and in appendix A to this part 84.\n(b) For blends containing a regulated substance, the global warming potential of the blend is the sum of the global warming potentials of each constituent of the blend multiplied by the nominal mass fraction of that constituent within the blend. The global warming potential of each constituent shall be as follows:\nTable 1 to Paragraph (b)\nSubstance name 100-Year global warming potential\n2-chloropropane 1\nAcetone 0.5\nAcetone/isopentane blend 1\nDimethyl ether 1\nFormic acid 5\nHCFO-1224yd(Z) 1\nHCFO-1233yd(Z) 1\nHCFO-1233zd(E) 4\nHCO-1130(E) 5\nHFE-347pcf2 987\nHFE-449s1 (HFE-7100) 297\nHFE-569sf2 59\nHFO-1234yf 1\nHFO-1234ze(E) 1\nHFO-1336mzz(E) 26\nHFO-1336mzz(Z) 2\nHydrocarbons (C5-C20) 1-2.7\nMethoxytridecafluoroheptane (MPHE) isomers 2.5\nMethyl formate 13\nMethylal (dimethoxymethane) 1\nOxygenated organic solvents (esters, ethers, alcohols, ketones) 1-13\nR-170 (ethane) 5.5\nR-290 (propane) 3.3\nR-600 (butane) 4\nR-600a (isobutane) 1\nR-717 (ammonia) 1\nR-744 (carbon dioxide) 1\nR-1150 (ethylene) 3.7\nR-1270 (propylene) 1.8\nSaturated light hydrocarbons (C3-C6) 1-4\n(c) For constituents of a blend containing a regulated substance that do not have a global warming potential as provided in paragraph (b) of this section, the constituent and its nominal mass fraction in the blend shall be excluded from the calculation in paragraph (b).","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 84—PHASEDOWN OF HYDROFLUOROCARBONS","Subpart B—Restrictions on the Use of Hydrofluorocarbons"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"a85314da5cc328ae4f57243ab3cb19907c4d1466ff96e068c361a148fdd5e399","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-84.62","next":"us/40-cfr-84.100"},"notice":"GroundRules: Original legal text. Not legal advice."}