Refrigerant Knowledge Center
What Is R454B Refrigerant? Properties, Uses and Safety
R454B is an A2L HFO/HFC blend selected for new air-conditioning and heat-pump platforms as a lower-GWP alternative to R410A, with different flammability and equipment-design requirements.
What Is R454B?
R454B is an A2L HFO/HFC blend selected for new air-conditioning and heat-pump platforms as a lower-GWP alternative to R410A, with different flammability and equipment-design requirements.
R454B is classified as zeotropic blend in the HFO/HFC blend family. Its composition is 68.9% R32 / 31.1% R1234yf by mass. Refrigerant choice is never based on designation alone: capacity, pressure, lubricant, controls, heat-exchanger behavior, safety standards and local rules all matter.
R454B Technical Properties
General reference values for comparison; a current product specification and applicable regulatory basis govern a transaction.
| Refrigerant designation | R454B |
|---|---|
| Chemical family | HFO/HFC blend |
| Composition | 68.9% R32 / 31.1% R1234yf by mass |
| Blend type | zeotropic blend |
| ASHRAE safety class | A2L |
| 100-year GWP | 467 (IPCC AR5 100-year, manufacturer-reported) |
| Ozone depletion potential | 0 |
| Normal boiling reference | -50.5 °C |
Common R454B Applications
Typical references include new residential and light commercial air conditioning, and heat pumps.
Use depends on equipment design, operating envelope and applicable local requirements.
Use depends on equipment design, operating envelope and applicable local requirements.
Advantages and Limitations
Selection advantages
- Established refrigerant designation with published reference data.
- Application history in new residential and light commercial air conditioning.
- ODP reference of 0.
Important limitations
- A2L safety controls must be applied.
- GWP and lifecycle status can affect long-term selection.
- No refrigerant should be treated as a universal drop-in.
Environmental Impact and Regulation
Listings and transition dates are end-use and jurisdiction specific; confirm the current rule and equipment certification before purchase.
R454B has an ODP reference of 0 and a stated GWP of 467 using IPCC AR5 100-year, manufacturer-reported. Regulations commonly distinguish between manufacturing or import, new equipment, servicing, recovered material and individual end uses.
Safety, Handling and Storage
R454B is intended for approved equipment and is not a universal drop-in; follow manufacturer instructions and all A2L installation and servicing controls.
The A2L classification describes toxicity and flammability groupings; it does not by itself approve a refrigerant for a particular system. Review the current safety data sheet, cylinder label, transport classification, equipment manual and local code.
R454B Alternatives and Comparisons
Candidate alternatives must be evaluated as system choices, not simple chemical substitutions.
HFC blend; A1 safety class; GWP 2088 on the stated IPCC AR4 100-year basis.
HFC; A2L safety class; GWP 675 on the stated IPCC AR4 100-year basis.
Review packaging, documentation and inquiry requirements for R454B.
R454B Frequently Asked Questions
What is R454B made of?
68.9% R32 / 31.1% R1234yf by mass; it is categorized as zeotropic blend.
What is the safety class of R454B?
The published classification used in this guide is A2L. Equipment approval and local safety rules still apply.
What is the GWP of R454B?
The reference here is 467 on the IPCC AR5 100-year, manufacturer-reported basis. Other assessment bases may show a different number.
Can R454B replace another refrigerant directly?
No universal drop-in claim is made. Compatibility and conversion requirements must be confirmed for the exact equipment.
Where is R454B commonly used?
Typical applications include new residential and light commercial air conditioning, and heat pumps, subject to equipment design and local approval.
References and Technical Sources
Source data is summarized for general education. Always use current official documents, standards and supplier-specific safety and technical data for engineering or compliance decisions.
Ask About R454B Refrigerant
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