The tables contained on this page list approved refrigerant numbers from ANSI/ASHRAE 34-2019, Designation and Safety Classification of Refrigerants, the latest edition of Standard 34, which describes a shorthand way of naming refrigerants and assigns safety classifications based on toxicity and flammability data.*

Further information can be found in the latest version of Standard 34, available in the ASHRAE bookstore, and its published addenda, available on the Standards Addenda page.

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Refrigerants

Refrigerant Blends

Refrigerants

Number Chemical Name Chemical Formula Methane Series 11 trichlorofluoromethane CCl 3 F 12 dichlorodifluoromethane CCl 2 F 2 12B1 bromochlorodifluoromethane CBrClF 2 13 chlorotrifluoromethane CClF 3 13B1 bromotrifluoromethane CBrF 3 14e tetrafluoromethane (carbon tetrafluoride) CF 4 21 dichlorofluoromethane CHCl 2 F 22 chlorodifluoromethane CHClF 2 23 trifluoromethane CHF 3 30 dichloromethane (methylene chloride) CH 2 Cl 2 31 chlorofluoromethane CH 2 ClF 32 difluoromethane (methylene fluoride) CH 2 F 2 40 chloromethane (methyl chloride) CH 3 Cl 41 fluoromethane (methyl fluoride) CH 3 F 50 methane CH 4 Number Chemical Name Chemical Formula Ethane Series 113 1,1,2-trichloro-1,2,2-trifluoroethane CCl 2 FCClF 2 114 1,2-dichloro-1,1,2,2-tetrafluoromethane CClF 2 CClF 2 115 chloropentafluoroethane CClF 2 CF 3 116 hexafluoroethane CF 3 CF 3 123 2,2-dichloro-1,1,1-trifluoroethane CHCl 2 CF 3 124 2-chloro-1,1,1,2-tetrafluoroethane CHClFCF 3 125 pentafluoroethane CHF 2 CF 3 134a 1,1,1,2-tetrafluoroethane CH 2 FCF 3 141b 1,1-dichloro-1-fluoroethane CH 3 CCl 2 F 142b 1-chloro-1,1-difluoroethane CH 3 CClF 2 143a 1,1,1-trifluoroethane CH 3 CF 3 152a 1,1-difluoroethane CH 3 CHF 2 170 ethane CH 3 CH 3 Number Chemical Name Chemical Formula Ethers E170 Dimethyl Ether CH 3 OCH 3 Number Chemical Name Chemical Formula Propane 218 octafluoropropane CF 3 CF 2 CF 3 227ea 1,1,1,2,3,3,3-heptafluoropropane CF 3 CHFCF 3 236fa 1,1,1,3,3,3-hexafluoropropane CF 3 CH 2 CF 3 245fa 1,1,1,3,3-pentafluoropropane CHF 2 CH 2 CF 3 290 propane CH 3 CH 2 CH 3 Number Chemical Name Chemical Formula Cyclic Organic Compounds C318 octafluorocyclobutane -(CF 2 ) 4 - Miscellaneous Organic Compounds Number Chemical Name Chemical Formula hydrocarbons 600 butane CH 3 CH 2 CH 2 CH 3 A3 600a isobutane CH(CH 3 ) 2 CH 3 A3 601 Pentane CH 3 CH 2 CH 2 CH 2 CH 3 601a Isopentane CH(CH 3 ) 2 CH 2 CH 3 oxygen compounds 610 ethyl ether CH 3 CH 2 OCH 2 CH 3 611 methyl formate HCOOCH 3 sulfur compounds 620 (Reserved for future assignment) Number Chemical Name Chemical Formula Nitrogen Compounds 630 methyl amine CH 3 NH 2 631 ethyl amine CH 3 CH 2 (NH 2 ) Number Chemical Name Chemical Formula Inorganic Compounds 702 hydrogen H 2 704 helium He 717 ammonia NH 3 718 water H 2 O 720 neon Ne 728 nitrogen N 2 732 oxygen O 2 740 argon Ar 744 carbon dioxide CO 2 744A nitrous oxide N 2 O 764 sulfur dioxide SO 2 Number Chemical Name Chemical Formula Unsaturated Organic Compounds 1130(E) trans-1,2-dichloroethene CHCl=CHCl R-1132a 1,1-difluoroethylene CF 2 =CH 2 1150 ethene (ethylene) CH 2 =CH 2 1233zd(E) trans-1-chloro-3,3,3-trifluoro-1-propene CF3CH=CHCl R-1224yd(Z) (Z)-1-chloro-2,3,3,3-tetrafluoropropene CF 3 CF=CHCl 1234yf 2,3,3,3-tetrafluoro-1-propene CF 3 CF=CH 2 1234ze(E) trans-1,3,3,3-tetrafluoro-1-propene CF 3 CH=CHF 1270 propene (propylene) CH 3 CH=CH 2 1336mzz(E) trans-1,1,1,4,4,4-hexafluoro-2-butene CF3CH=CHCF3 1336mzz(Z) cis-1,1,1,4,4,4-hexaflouro-2-butene CF3CHCHCF3 Refrigerant Blends Number Refrigerant Composition (Mass % ) Zeotropes 400 R-12/114 (must be specified) (50.0/50.0) (60.0/40.0) 401A R-22/152a/124 (53.0/13.0/34.0) 401B R-22/152a/124 (61.0/11.0/28.0 401C R-22/152a/124 (33.0/15.0/52.0) 402A R-125/290/22 (60.0/2.0/38.0) 402B R-125/290/22 (38.0/2.0/60.0) 403A R-290/22/218 (5.0/75.0/20.0) 403B R-290/22/218 (5.0/56.0/39.0) 404A R-125/143a/134a (44.0/52.0/4.0) 405A R-22/152a/142b/C318 (45.0/7.0/5.5/42.5) 406A R-22/600a/142b (55.0/4.0/41.0) 407A R-32/125/134a (20.0/40.0/40.0) 407B R-32/125/134a (10.0/70.0/20.0) 407C R-32/125/134a (23.0/25.0/52.0) 407D R-32/125/134a (15.0/15.0/70.0) 407E R-32/125/134a (25.0/15.0/60.0) 407F R-32/125/134a (30.0/30.0/40.0) 407G R-32/125/134a (2.5/2.5/95.0) 407H R-32/125/134a (32.5/15.0/52.5) 407I R-32/125/134a (19.5/8.5/72.0) 408A R-125/143a/22 (7.0/46.0/47.0) 409A R-22/124/142b (60.0/25.0/15.0) 409B R-22/124/142b (65.0/25.0/10.0) 410A R-32/125 (50.0/50.0) 410B R-32/125 (45.0/55.0) 411A R-1270/22/152a) (1.5/87.5/11.0) 411B R-1270/22/152a (3.0/94.0/3.0) 412A R-22/218/143b (70.0/5.0/25.0 k 413A R-218/134a/600a (9.0/88.0/3.0) 414A R-22/124/600a/142b (51.0/28.5/4.0/16.5) 414B R-22/124/600a/142b (50.0/39.0/1.5/9.5) 415A R-22/152a (82.0/18.0) 415B R-22/152a (25.0/75.0) 416A R-134a/124/600 (59.0/39.5/1.5) 417A R-125/134a/600 (46.6/50.0/3.4) 417B R-125/134a/600 (79.0/18.3/2.7) 417C R-125/134a/600 (19.5/78.8/1.7) 418A R-290/22/152a (1.5/96.0/2.5) 419A R-125/134a/E170 (77.0/19.0/4.0) 419B R-125/134a/E170 (48.5/48.0/3.5) 420A R-134a/142b (88.0/12.0) 421A R-125/134a (58.0/42.0) 421B R-125/134a (85.0/15.0) 422A R-125/134a/600a (85.1/11.5/3.4) 422B R-125/134a/600a (55.0/42.0/3.0) 422C R-125/134a/600a (82.0/15.0/3.0) 422D R-125/134a/600a (65.1/31.5/3.4) 422E R-125/134a/600a (58.0/39.3/2.7) 423A 134a/227ea (52.5/47.5) 424A R-125/134a/600a/600/601a (50.5/47.0/0.9/1.0/0.6) 425A R-32/134a/227ea (18.5/69.5/12) 426A R-125/134a/600/601a (5.1/93.0/1.3/0.6) 427A R-32/125/143a/134a (15.0/25.0/10.0/50.0) 428A R-125/143a/290/600a (77.5/20.0/0.6/1.9) 429A R-E170/152a/600a (60.0/10.0/30.0) 430A R-152a/600a (76.0/24.0) 431A R-290/152a (71.0/29.0) 432A R-1270/E170 (80.0/20.0) 433A R-1270/290 (30.0/70.0) 433B R-1270/290 (5.0/95.0) 433C R-1270/290 (25.0/75.0) 434A R-125/143a/134a/600a (63.2/18.0/16.0/2.8) 435A R-E170/152a (80.0/20.0) 436A R-290/600a (56.0/44.0) 436B R-290/600a (52.0/48.0) 436C R-290/600a (95.0/5.0) 437A R-125/134a/600/601 (19.5/78.5/1.4/0.6) 438A R-32/125/134a/600/601a (8.5/45.0/44.2/1.7/0.6) 439A R-32/125/600a (50.0/47.0/3.0) 440A R-290/134a/152a (0.6/1.6/97.8) 441A R-170/290/600a/600 (3.1/54.8/6.0/36.1) 442A R-32/125/134a/152a/227ea (31.0/31.0/30.0/3.0/5.0) 443A R-1270/290/600a (55.0/40.0/5.0) 444A R-32/152a/1234ze(E) (12.0/5.0/83.0) 444B R-32/152a/1234ze(E) (41.5/10.0/48.5) 445A R-744/134a/1234ze(E) (6.0/9.0/85.0) 446A R-32/1234ze(E)/600 (68.0/29.0/3.0) 446B R-32/125/1234ze(E) (68.0/3.5/28.5) 447B R-32/125/1234ze (E) (68.0/8.0/24.0) 448A R-32/125/1234yf/134a/1234ze(E) (26.0/26.0/20.0/21.0/7.0) 449A R-32 /125 /1234yf /134a (24.3/24.7/25.3/25.7) 449B R-32/125/1234yf/134a (25.2/24.3/23.2/27.3) 449C R-32/125/1234yf/134a (20.0/20.0/31.0/29.0) 450A R-134a/1234ze(E) (42.0/58.0) 451A R-1234yf/134a (89.8/10.2) 451B R-1234yf/134a (88.8/11.2) 452A R-32/125/1234yf (11.0/59.0/30.0) 452B R-32/125/1234yf (67.0/7.0/26.0) 452C R-32/125/1234yf (12.5/61.0/26.5) 453A R-32/125/134a/227ea/600/601a (20.0/20.0/53.8/5.0/0.6/0.6) 454A R-32/1234yf (35.0/65.0) 454B R-32/1234yf (68.9/31.1) 454C R-32/1234yf (21.5/78.5) 455A R-744/32/1234yf (3.0/21.5/75.5) 456A R-32/134a/1234ze(E) (6.0/45.0/49.0) 457A R-32/1234yf/152a (18.0/70.0/12.0) 458A R-32/125/134a/227ea/236fa (20.5/4.0/61.4/13.5/0.6) 459A R-32/1234yf/1234ze(E) (68.0/26.0/6.0) 459B LTR 11: R-32/1234yf/1234ze(E) (21.0/69.0/10.0) 460A LTR 10: R-32/125/134a/1234ze(E) (12.0/52.0/14.0/22.0) 460B LTR4X10: R-32/125/134a/1234ze(E) (28.0/25.0/20.0/27.0) 460C R-32/125/134a/1234ze(E) (2.5/2.5/46.0/49.0) 461A R-125/143a/134a/227ea/600a (55.0/5.0/32.0/5.0/3.0) 462A R-32/125/143a/134a/600 (9.0/42.0/2.0/44.0/3.0) 463A R-744/32/125/1234yf/134a (6.0/36.0/30.0/14.0/14.0) 464A R-32/125/1234ze(E)/227ea (27.0/27.0/40.0/6.0) 465A R-32/290/1234yf (21.0/7.9/71.1) Refrigerant Composition (Mass % ) Number Azeotropes 500 R-12/152a (73.8/26.2) 501 R-22/12 (75.0/25.0) 502 R-22/115 (48.8/51.2) 503 R-23/13 (40.1/59.9) 504 R-32/115 (48.2/51.8) 505 R-12/31 (78.0/22.0) 506 R-31/114 (55.1/44.9) 507A R-125/143a (50.0/50.0) 508A R-23/116 (39.0/61.0) 508B R-23/116 (46.0/54.0) 509A R-22/218 (44.0/56.0) 510A R-E170/600a (88.0/12.0) 511A R-290/E170 (95.0/5.0) 512A R-134a/152a (5.0/95.0) 513A R-1234yf/134a (56.0/44.0) 513B R-1234yf/134a (58.5/41.5) 514A R-1336mzz(Z)/1130(E) (74.7/25.3) 515A R-1234ze (E)/227ea (88.0/12.0) 516A R-1234yf/134a/152a (77.5/8.5/14.0)

* This list is not intended to be complete or definitive. Please refer to the latest edition of ASHRAE Standard 34 and all published addenda for complete information on refrigerant designations and safety classifications.

For more information on ASHRAE Standard 34 please contact the Assistant Manager of Standards - International or the Manager of Standards at ASHRAE, 1791 Tullie Circle, N.E., Atlanta, GA 30329-2305.

PHONE: 404-636-8400

FAX: 404-321-5478

E-mail: standards.section@ashrae.org

Updated 6/10/2019