Refrigerant Knowledge Center
What Is R448A Refrigerant? Properties, Uses and Safety
R448A is an A1 zeotropic HFO/HFC blend used for low- and medium-temperature commercial refrigeration, including selected new systems and engineered conversions from higher-GWP refrigerants.
What Is R448A?
R448A is an A1 zeotropic HFO/HFC blend used for low- and medium-temperature commercial refrigeration, including selected new systems and engineered conversions from higher-GWP refrigerants.
R448A is classified as zeotropic blend in the HFO/HFC blend family. Its composition is 26% R32 / 26% R125 / 21% R134a / 20% R1234yf / 7% R1234ze(E) by mass. Refrigerant choice is never based on designation alone: capacity, pressure, lubricant, controls, heat-exchanger behavior, safety standards and local rules all matter.
R448A Technical Properties
General reference values for comparison; a current product specification and applicable regulatory basis govern a transaction.
| Refrigerant designation | R448A |
|---|---|
| Chemical family | HFO/HFC blend |
| Composition | 26% R32 / 26% R125 / 21% R134a / 20% R1234yf / 7% R1234ze(E) by mass |
| Blend type | zeotropic blend |
| ASHRAE safety class | A1 |
| 100-year GWP | 1273 (IPCC AR5 100-year, manufacturer-reported) |
| Ozone depletion potential | 0 |
| Normal boiling reference | -45.9 (glide applies) °C |
Common R448A Applications
Typical references include low- and medium-temperature commercial refrigeration, and supermarket systems.
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 low- and medium-temperature commercial refrigeration.
- ODP reference of 0.
Important limitations
- A1 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
Its GWP and permitted applications should be checked against current national rules and any new-equipment or service thresholds.
R448A has an ODP reference of 0 and a stated GWP of 1273 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
Charge as liquid and account for glide, control settings, seals, lubricant and compressor operating envelope under an approved conversion procedure.
The A1 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.
R448A 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 1282 on the stated IPCC AR5 100-year, manufacturer-reported basis.
R448A Frequently Asked Questions
What is R448A made of?
26% R32 / 26% R125 / 21% R134a / 20% R1234yf / 7% R1234ze(E) by mass; it is categorized as zeotropic blend.
What is the safety class of R448A?
The published classification used in this guide is A1. Equipment approval and local safety rules still apply.
What is the GWP of R448A?
The reference here is 1273 on the IPCC AR5 100-year, manufacturer-reported basis. Other assessment bases may show a different number.
Can R448A replace another refrigerant directly?
No universal drop-in claim is made. Compatibility and conversion requirements must be confirmed for the exact equipment.
Where is R448A commonly used?
Typical applications include low- and medium-temperature commercial refrigeration, and supermarket systems, 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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