R454C properties
| Code | R454C |
|---|---|
| Chemical name / composition | Blend of R32 and R1234yf R32 / R1234yf (21.5% / 78.5%) |
| Family | HFO/HFC blend |
| GWP (AR4, 100 years) | 148 |
| ODP | 0 |
| Safety class (ISO 817 / ASHRAE 34) | A2L: lower toxicity, mildly flammable |
| Boiling point (1 atm) | −46.0 °C |
| Temperature glide | 7.8 K |
| Charge equal to 5 t CO₂e | 33.8 kg |
| Status | Next generation |
Where is R454C used?
- Commercial refrigeration and condensing units
- Heat pumps
- Cold rooms
Service and safety notes
- Zeotropic blend, glide about 7.8 K: always charge in liquid phase; after a large leak, recover and recharge the full system. Use dew point for superheat and bubble point for subcooling.
- Mildly flammable (A2L). Work away from ignition sources, use A2L-rated vacuum pumps, recovery units and leak detectors, and respect charge limits for the room size (EN 378).
- Never charge a system with a refrigerant other than the one on its nameplate; retrofits need manufacturer approval and oil and component checks.
- Charging, recovery and leak checks must be done and recorded by F-gas certified technicians.
R454C and regulations
Covered by Türkiye's Regulation on Fluorinated Greenhouse Gases (Official Gazette, 15 October 2024). HFC supply is being phased down with quotas, high-GWP gases are restricted earlier, leak-check intervals depend on the CO₂-equivalent charge, and handling requires certified technicians. With a GWP below 750 it is among the preferred next-generation options. Always check the current legal text for exact dates and scope.
Alternatives to R454C
- R290: Hydrocarbon (natural), GWP 3, A3
- R744: Natural refrigerant, GWP 1, A1
- R448A: HFO/HFC blend, GWP 1,387, A1
Compare all refrigerants in our refrigerant guide.
Other refrigerants
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Frequently asked questions
What is the GWP of R454C?
The 100-year global warming potential (AR4) of R454C is about 148.
Is R454C flammable?
A2L: lower toxicity, mildly flammable.
What can replace R454C?
Depending on the application: R290, R744, R448A. Conversions require manufacturer approval and oil and component checks.