{{Short description|Refrigerant}} '''R-454B''', also known by the trademarked names '''Opteon XL41''', '''Solstice 454B''', and '''Puron Advance,''' is a zeotropic blend of 68.9 percent difluoromethane (R-32), a hydrofluorocarbon, and 31.1 percent 2,3,3,3-tetrafluoropropene (R-1234yf), a hydrofluoroolefin.<ref name="DESIGNATIONS">{{cite web | title=ASHRAE Refrigerant Designations | url=https://www.ashrae.org/technical-resources/standards-and-guidelines/ashrae-refrigerant-designations | accessdate=June 27, 2021}}</ref> Because of its reduced global warming potential (GWP), R-454B is intended to be an alternative to refrigerant R-410A in new equipment.<ref name="XL41">{{Cite web | title=Opteon XL41 product information | url=https://www.opteon.com/en/products/refrigerants/xl41 | accessdate=June 27, 2021}}</ref><ref>{{cite web | title=Solstice 454B product information | url=https://www.honeywell-refrigerants.com/europe/product/solstice-454b-r-454b/ | accessdate=June 27, 2021}}</ref><ref name="Puron">{{cite press release | title=Carrier Introduces Puron Advance | url=https://www.carrier.com/residential/en/us/news/news-article/carrier_introduces_puron_advance_the_next_generation_refrigerant.html | date=December 19, 2018}}</ref> R-454B has a GWP of 466, which is 78 percent lower than R-410A's GWP of 2088.<ref name="XL41"/>
R-454B is non-toxic and mildly flammable, with an ASHRAE safety classification of A2L. In the United States, it is expected to be packaged in a container that is red or has a red band on the shoulder or top. These containers are supplied with a left-hand thread valve to prevent cross-contamination.<ref name="XL41"/><ref>{{cite journal |date=May 6, 2021 |title=Protection of Stratospheric Ozone: Listing of Substitutes Under the Significant New Alternatives Policy Program |url=https://www.federalregister.gov/documents/2021/05/06/2021-08968/protection-of-stratospheric-ozone-listing-of-substitutes-under-the-significant-new-alternatives |journal=Federal Register |publisher=United States Environmental Protection Agency |volume=86 |issue=86 |pages=24444–24474}}</ref><ref>{{cite web |title=AHRI Guideline N: 2017 Guideline for Assignment of Refrigerant Container Colors |url=https://www.ahrinet.org/system/files/2023-06/AHRI_Guideline_N_2017.pdf |accessdate=June 27, 2021}}</ref>
There is a shortage of R-454B in the United States as of May 2025.<ref>{{Cite web |date=2025-05-08 |title=Nationwide shortage of new AC refrigerant hits as Arizona heats up |url=https://www.12news.com/article/money/economy/shortage-air-conditioning-refrigerant-causes-problems-for-contractors-delay-ac-installations-valley-homeowners/75-f385fbdc-3541-499a-8382-4aaebcf0c610 |access-date=2025-06-06 |website=12news.com |language=en-US}}</ref><ref>{{Cite web |last=Mufich |first=Adam |date=2025-05-06 |title=Cold Truth: The R-454B Shortage |url=https://www.contractingbusiness.com/refrigeration/article/55288344/cold-truth-the-r-454b-shortage |access-date=2025-06-06 |website=Contracting Business |language=en}}</ref><ref>{{Cite web |title=R-454B Shortage Is No Excuse for Mixing Refrigerants {{!}} ACHR News |url=https://www.achrnews.com/articles/164669-r-454b-shortage-is-no-excuse-for-mixing-refrigerants |access-date=2025-06-06 |website=www.achrnews.com |language=en}}</ref>
==History== The refrigeration industry has been seeking replacements for R-410A because of its high global warming potential. R-454B, formerly known as DL-5A, has been selected by several manufacturers.<ref name="Puron"/><ref>{{cite press release | title=Opteon XL41 (R-454B) and Opteon XP10 (R-513A) Refrigerants selected by Mitsubishi Electric Hydronics and IT Cooling Systems SpA (MEHITS) Applications | url=https://www.chemours.com/en/news-media-center/all-news/press-releases/2019/opteon-xl41-r-454b-and-opteon-xp10-r-513a-refrigerants-selected-by-mitsubishi-electric-hydronics-and | date=May 27, 2019}}</ref><ref>{{cite web | title=Honeywell to offer R454B as alternative to R410A | url=https://www.coolingpost.com/world-news/honeywell-to-offer-r454b-as-alternative-to-r410a | date=March 13, 2021}}</ref><ref>{{cite web | title=Johnson Controls moves to R454B | url=https://www.coolingpost.com/world-news/johnson-controls-moves-to-r454b/ | date=May 27, 2021}}</ref><ref>{{cite web | url=https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=2608&context=iracc | title=Behavior of R410A Low GWP Alternative Refrigerants DR-55, DR-5A, and R32 in the Components of a 4-RT RTU DR-5A, and R32 in the Components of a 4-RT RTU | publisher=Purdue University Purdu | year=2016 | accessdate=June 30, 2021}}</ref>
R-454B was developed at and is manufactured by Chemours. Carrier first announced introduction of R-454B in ducted residential and light commercial packaged refrigeration and air conditioning products in 2018, with R-454B-based products launches starting in 2023.<ref>{{cite web|url=https://www.carrier.com/carrier/en/worldwide/news/news-article/carrier_introduces_puron_advance_the_next_generation_refrigerant.html|title=Carrier Introduces Puron Advance™: The Next Generation Refrigerant for Ducted Residential, Light Commercial Products in North America|publisher=Carrier Corporation (since 2020 Carrier Global Corporation)|date=2018-12-19|accessdate=2021-07-26}}</ref>
==Related refrigerants== R-454B is not the only blend of R-32 and R-1234yf to be proposed as a refrigerant. Other blends include R-454A (35 percent R-32, 65 percent R-1234yf) and R-454C (21.5 percent R-32, 78.5 percent R1234yf). There are also several blends that include a third component.<ref name="DESIGNATIONS"/>
== See also == * R-410A, a refrigerant that is being phased out in some countries, and which R-454B is a popular replacement for * Difluoromethane, R-32, another R-410A replacement * List of refrigerants
== References == {{reflist}}
Category:Refrigerants Category:Greenhouse gases Category:Daikin