Refrigerant Knowledge Center
What Is R454C Refrigerant? Properties, Uses and Safety
R454C is an A2L zeotropic HFO/HFC blend with reported GWP below 150, intended for purpose-designed commercial refrigeration equipment requiring both glide management and mild-flammability controls.
What Is R454C?
R454C is an A2L zeotropic HFO/HFC blend with reported GWP below 150, intended for purpose-designed commercial refrigeration equipment requiring both glide management and mild-flammability controls.
R454C is classified as zeotropic blend in the HFO/HFC blend family. Its composition is 21.5% R32 / 78.5% 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.
R454C Technical Properties
General reference values for comparison; a current product specification and applicable regulatory basis govern a transaction.
| Refrigerant designation | R454C |
|---|---|
| Chemical family | HFO/HFC blend |
| Composition | 21.5% R32 / 78.5% R1234yf by mass |
| Blend type | zeotropic blend |
| ASHRAE safety class | A2L |
| 100-year GWP | 146 (IPCC AR5 100-year, manufacturer-reported) |
| Ozone depletion potential | 0 |
| Normal boiling reference | -45.6 (glide applies) °C |
Common R454C Applications
Typical references include new low- and medium-temperature commercial refrigeration, and condensing units.
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 low- and medium-temperature commercial refrigeration.
- 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
Low GWP supports some transitions but does not establish universal acceptance; equipment standards and local codes govern each use.
R454C has an ODP reference of 0 and a stated GWP of 146 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
Use only in approved A2L equipment, charge as liquid and follow charge-size, ventilation, leak-detection and ignition-control requirements.
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.
R454C Alternatives and Comparisons
Candidate alternatives must be evaluated as system choices, not simple chemical substitutions.
HFC blend; A1 safety class; GWP 3922 on the stated IPCC AR4 100-year basis.
HFC blend; A1 safety class; GWP 3985 on the stated IPCC AR4 100-year basis.
HFO/HFC blend; A1 safety class; GWP 1273 on the stated IPCC AR5 100-year, manufacturer-reported basis.
HFO/HFC blend; A1 safety class; GWP 1282 on the stated IPCC AR5 100-year, manufacturer-reported basis.
R454C Frequently Asked Questions
What is R454C made of?
21.5% R32 / 78.5% R1234yf by mass; it is categorized as zeotropic blend.
What is the safety class of R454C?
The published classification used in this guide is A2L. Equipment approval and local safety rules still apply.
What is the GWP of R454C?
The reference here is 146 on the IPCC AR5 100-year, manufacturer-reported basis. Other assessment bases may show a different number.
Can R454C replace another refrigerant directly?
No universal drop-in claim is made. Compatibility and conversion requirements must be confirmed for the exact equipment.
Where is R454C commonly used?
Typical applications include new low- and medium-temperature commercial refrigeration, and condensing units, 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.
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