R454B properties
| Code | R454B |
|---|---|
| Chemical name / composition | Blend of R32 and R1234yf R32 / R1234yf (68.9% / 31.1%) |
| Family | HFO/HFC blend |
| GWP (AR4, 100 years) | 466 |
| ODP | 0 |
| Safety class (ISO 817 / ASHRAE 34) | A2L: lower toxicity, mildly flammable |
| Boiling point (1 atm) | −50.9 °C |
| Temperature glide | 1.0 K |
| Charge equal to 5 t CO₂e | 10.7 kg |
| Status | Next generation |
Where is R454B used?
- New packaged and rooftop units
- Air-cooled chillers
- Split units and heat pumps
Service and safety notes
- Zeotropic blend, glide about 1.0 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.
R454B 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 R454B
Compare all refrigerants in our refrigerant guide.
Other refrigerants
Our base is in Ankara Etimesgut. We work daily in Ankara and on a project and contract basis across Türkiye. Türkçe sayfa.
Frequently asked questions
What is the GWP of R454B?
The 100-year global warming potential (AR4) of R454B is about 466.
Is R454B flammable?
A2L: lower toxicity, mildly flammable.
What can replace R454B?
Depending on the application: R32, R290, R410A. Conversions require manufacturer approval and oil and component checks.