Refrigerant Knowledge Center
What Is R404A Refrigerant? Properties, Uses and Safety
R404A is an A1 HFC blend long used in low- and medium-temperature refrigeration, but its very high GWP has made lower-GWP retrofit and new-equipment options central to system planning.
What Is R404A?
R404A is an A1 HFC blend long used in low- and medium-temperature refrigeration, but its very high GWP has made lower-GWP retrofit and new-equipment options central to system planning.
R404A is classified as near-azeotropic blend in the HFC blend family. Its composition is 52% R143a / 44% R125 / 4% R134a by mass. Refrigerant choice is never based on designation alone: capacity, pressure, lubricant, controls, heat-exchanger behavior, safety standards and local rules all matter.
R404A Technical Properties
General reference values for comparison; a current product specification and applicable regulatory basis govern a transaction.
| Refrigerant designation | R404A |
|---|---|
| Chemical family | HFC blend |
| Composition | 52% R143a / 44% R125 / 4% R134a by mass |
| Blend type | near-azeotropic blend |
| ASHRAE safety class | A1 |
| 100-year GWP | 3922 (IPCC AR4 100-year) |
| Ozone depletion potential | 0 |
| Normal boiling reference | -46.2 to -45.5 °C |
Common R404A Applications
Typical references include low- and medium-temperature commercial refrigeration, and transport refrigeration.
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
Use and servicing are restricted in several markets because of high GWP; always check the exact end-use and reclaimed-gas provisions.
R404A has an ODP reference of 0 and a stated GWP of 3922 using IPCC AR4 100-year. Regulations commonly distinguish between manufacturing or import, new equipment, servicing, recovered material and individual end uses.
Safety, Handling and Storage
Charge the blend as liquid and follow the equipment and compressor manufacturers’ retrofit guidance; selection of an alternative is system specific.
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.
R404A Alternatives and Comparisons
Candidate alternatives must be evaluated as system choices, not simple chemical substitutions.
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.
HFO/HFC blend; A2L safety class; GWP 146 on the stated IPCC AR5 100-year, manufacturer-reported basis.
hydrocarbon; A3 safety class; GWP 3 on the stated IPCC AR4 100-year basis.
natural refrigerant; A1 safety class; GWP 1 on the stated CO2 reference value, 100-year basis.
Review packaging, documentation and inquiry requirements for R404A.
R404A Frequently Asked Questions
What is R404A made of?
52% R143a / 44% R125 / 4% R134a by mass; it is categorized as near-azeotropic blend.
What is the safety class of R404A?
The published classification used in this guide is A1. Equipment approval and local safety rules still apply.
What is the GWP of R404A?
The reference here is 3922 on the IPCC AR4 100-year basis. Other assessment bases may show a different number.
Can R404A replace another refrigerant directly?
No universal drop-in claim is made. Compatibility and conversion requirements must be confirmed for the exact equipment.
Where is R404A commonly used?
Typical applications include low- and medium-temperature commercial refrigeration, and transport refrigeration, 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 R404A Refrigerant
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