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ASHRAE Refrigerant Designations

 

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The tables contained on this page list approved refrigerant numbers from ANSI/ASHRAE 34-2022, Designation and Safety Classification of Refrigerants, 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.   

Quicklinks:

Refrigerants 

Refrigerant Blends

Refrigerants

Number
Chemical Name
Chemical Formula
 
Methane Series
11 trichlorofluoromethane CCl 3F
12 dichlorodifluoromethane CCl 2F 2
12B1 bromochlorodifluoromethane CBrClF 2
13 chlorotrifluoromethane CClF 3
13B1 bromotrifluoromethane CBrF 3
13I1 trifluoroiodomethane CF3 I
14e tetrafluoromethane (carbon tetrafluoride) CF 4
21 dichlorofluoromethane CHCl 2F
22 chlorodifluoromethane CHClF 2
23 trifluoromethane CHF 3
30 dichloromethane (methylene chloride) CH 2Cl 2
31 chlorofluoromethane CH 2ClF
32 difluoromethane (methylene fluoride) CH 2F 2
40 chloromethane (methyl chloride) CH 3Cl
41 fluoromethane (methyl fluoride) CH 3F
50 methane CH 4

Number
Chemical Name
Chemical Formula
 
Ethane Series
113 1,1,2-trichloro-1,2,2-trifluoroethane CCl 2FCClF 2
114 1,2-dichloro-1,1,2,2-tetrafluoromethane CClF 2CClF 2
115 chloropentafluoroethane CClF 2CF 3
116 hexafluoroethane CF 3CF 3
123 2,2-dichloro-1,1,1-trifluoroethane CHCl 2CF 3
124 2-chloro-1,1,1,2-tetrafluoroethane CHClFCF 3
125 pentafluoroethane CHF 2CF 3
134a 1,1,1,2-tetrafluoroethane CH 2FCF 3
141b 1,1-dichloro-1-fluoroethane CH 3CCl 2F
142b 1-chloro-1,1-difluoroethane CH 3CClF 2
143a 1,1,1-trifluoroethane CH 3CF 3
152a 1,1-difluoroethane CH 3CHF 2
170 ethane CH 3CH 3

Number
Chemical Name
Chemical Formula
 
Ethers
E170 Methoxymethane (dimethyl ether) CH3OCH3

Number
Chemical Name
Chemical Formula
 
Propane
218 octafluoropropane CF 3CF 2CF 3
227ea 1,1,1,2,3,3,3-heptafluoropropane CF 3CHFCF 3
236fa 1,1,1,3,3,3-hexafluoropropane CF 3CH 2CF 3
245fa 1,1,1,3,3-pentafluoropropane CHF 2CH 2CF 3
290 propane CH 3CH 2CH 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 3CH 2CH 2CH 3 A3
600a 2-methylpropane (isobutane) CH(CH 3) 2CH 3 A3
601 pentane CH 3CH 2CH 2 CH 2CH 3
601a 2-methylbutane (isopentane) CH(CH 3) 2 CH 2CH 3
oxygen compounds
610 ethoxyethane (ethyl ether) CH 3CH 2 OCH 2CH 3
611 methyl formate HCOOCH 3
sulfur compounds
620 (Reserved for future assignment)  

Number
Chemical Name
Chemical Formula
 
Nitrogen Compounds
630 methanamine (methyl amine) CH 3NH 2
631 ethanamine (ethyl amine) CH 3CH 2(NH 2)

Number
Chemical Name
Chemical Formula
 
Inorganic Compounds
702 hydrogen H 2
704 helium He
717 ammonia NH 3
718 water H 2O
720 neon Ne
728 nitrogen N 2
732 oxygen O 2
740 argon Ar
744 carbon dioxide CO 2
744A nitrous oxide N 2O
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 CF2=CH2
R-1132(E) trans-1,2-difluoroethene (E)-CFH=CFH
1150 ethene (ethylene) CH2=CH2
R-1224yd(Z) (Z)-1-chloro-2,3,3,3-tetrafluoropropene CF3CF=CHCl
1233zd(E) trans-1-chloro-3,3,3-trifluoro-1-propene CF3CH=CHCl
1234yf 2,3,3,3-tetrafluoro-1-propene CF3CF=CH2
1234ze(E) trans-1,3,3,3-tetrafluoro-1-propene CF3CH=CHF
1270 propene (propylene) CH3CH=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 CF3CH=CHCF3

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)  
427C R-32/125/143a/134a (25.0/25.0/10.0/40.0)  
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)  
447A 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)  
448B R-32/125/1234yf/134a/1234ze(E) (21.0/21.0/20.0/31.0/7.0)  
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)  
457B R-32/1234yf/152a (35.0/55.0/10.0)  
457C R-32/1234yf/152a (7.5/78.0/14.5)  
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)  
466A R-32/125/131I (49.0/11.5/39.5)  
467A R-32/125/134a/600a (22.0/5.0/72.4/0.6)  
468A R-1132a/32/1234yf (3.5/21.5/75.0)  
468B R-1132a/32/1234yf (6.0/13.0/81.0)  
468C R-1132a/32/1234yf (6.0/42.0/52.0)  
469A R-744/32/125 (35.0/32.5/32.5)  
470A R-744/32/125/134a/1234ze(E)/227ea (10.0/17.0/19.0/7.0/44.0/3.0)  
470B R-744/32/125/134a/1234ze(E)/227ea (10.0/11.5/11.5/3.0/57.0/7.0)  
471A R-1234ze(E)/227ea/1336mzz(E) (78.7/4.3/17.0)  
472A R-744/32/134a (69.0/12.0/19.0)  
472B R-744/32/134a (58.0/10.0/32.0)  
473A R-1132a/23/744/125 (20.0/10.0/60.0/10.0)  
474A R-1132(E)/1234yf (23.0/77.0)  
475A R-1234yf/134a/1234ze(E) (45.0/43.0/12.0)  
476A R-134a/1234ze(E)/1336mzz(E) (10.0/78.0/12.0)  

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)  
515B R-1234ze(E)/227ea (91.1/8.9)  
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 Manager of Standards - International or the Senior Manager of Standards at ASHRAE, 180 Technology Parkway, Peachtree Corners, 30092.
PHONE: 404-636-8400
FAX: 404-321-5478
E-mail: standards.section@ashrae.org
Updated 5/25/2021

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