R454B (Opteon™ XL41 / Solstice® 454B)

R-454B (Opteon™ XL41 / Solstice® 454B)

Low GWP (466) A2L safety class alternative to R-410A for use in direct expansion air conditioning and heat pump applications.

Features and Benefits

  • Lowest GWP R-410A alternative – Sustainable and compliant with F-Gas legislation
  • Increased performance compared to R-410A – Lower indirect emissions and operating costs.
  • Approved by many equipment manufacturers – Choice of new equipment available.

Packaging and Supply

  • Climalife supply R-454B in 9kg or 44kg returnable cylinders.
  • Conforms to AHRI 700-2016 specifications.
  • As R-454B is safety class A2L, it is important to use the right equipment for handling R-454B.

Why Choose Climalife?

Climalife are a key player in the distribution of refrigerants and other climate control products, with a nationwide distribution network and product knowledge that is second to none.

How does R-454B compare to R-410A?

R-454B has an improved cooling and energy efficiency performance compared to R‑410A. R-454B does have the safety classification A2L due to its low flammability. R‑454B should only be used in systems compatible for use with low flammability refrigerants.

Full theoretical performance comparisons at customer specified conditions are available from Climalife on request.




HFC-32/R-1234yf - 68.9/31.1% by mass

Chemical Formula



Molecular Mass


Boiling Point (at 1 Atmosphere)


Dew Point (at 1 Atmosphere)


Saturated Liquid Density at 25°C

984.6 kg/m³

Saturated Vapour Density at 1.013bar

3.565 kg/m³

Saturated Liquid Pressure at 25°C

15.708 bar

Saturated Liquid Pressure at 50°C

29.020 bar

Critical Temperature


Critical Pressure

52.669 bar

Critical Density

443.0 kg/m³

Critical Volume

0.00226 m³/kg

Latent Heat of vapourisation at 1.013bar

316.3 kJ/kg

Thermal Conductivity of Liquid at 25°C

105.5 mW/(m.K)

Thermal Conductivity of Vapour at 25°C & 1.013bar

13.0 mW/(m.K)

Surface tension at 25°C

6.11 mN/m

Viscosity of Liquid at 25°C

0.115 mPa.s

Viscosity of Vapour at 25°C & 1.013bar

0.013 mPa.s

Specific heat of liquid at 25°C

1.799 kJ/(kg.K)

Specific heat of vapour at 25°C and 1.013bar

0.8650 kJ/(kg.K)

Cp/Cv ratio at 25° and 1.013 bar


Lower Fammability Limit (LFL) in air (EN 378)


Flash Point


ISO 817 / ASHRAE 34 Safety Classification


PED Fluid Group


Ozone Depletion Potential (ODP)


Global Warming Potential (GWP) IPCC AR4/IPCC AR5


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