Solstice® ze (R-1234ze)

Ultra low GWP (7), energy-efficient alternative to traditional refrigerants for air-cooled and water-cooled chillers in a range of applications and have already been used in supermarkets and commercial buildings.

Features and Benefits

  • Ultra Low GWP – Long term sustainable and compliant with F-Gas legislation
  • Single component refrigerant – can be used in direct expansion and flooded systems. No temperature glide.
  • Comparable energy efficiency to R-134a – Lower indirect emissions and lower operating costs.
  • Approved by many equipment manufacturers – Large choice of new equipment available.
  • Non-flammable at 20°C ambient temperature – PED fluid group 2 and classed as non-flammable for transport.

Packaging and Supply

Climalife supply Solstice® ZE in 12kg and 58kg returnable cylinders or 890 kg returnable drums.

Conforms to AHRI 700-2016 specifications.

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 Solstice® ze compare to R-134a?

Solstice® ze has a slightly lower cooling performance compared to R-134a but good energy efficiency making it an ideal ultra low GWP alternative to R‑134a in new equipment. Solstice® ze does have the safety classification A2L due to its low flammability at elevated temperatures but is classed under the PE(S)R, CLP package and labelling and ADR transport regulations as non-flammable. It should only be used in systems specifically designed for Solstice® ze.

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


Chemical Formula

CHF=CHCF3 (trans)

Molecular Mass


Boiling Point (at 1 Atmosphere)


Dew Point (at 1 Atmosphere)


Saturated Liquid Density at 25°C

1163.1 kg/m³

Saturated Vapour Density at 1.013bar

5.705 kg/m³

Saturated Liquid Pressure at 25°C

4.985 bar

Saturated Liquid Pressure at 50°C

9.972 bar

Critical Temperature


Critical Pressure

36.349 bar

Critical Density

489.2 kg/m³

Critical Volume

0.00204 m³/kg

Latent Heat of vapourisation at 1.013bar

195.6 kJ/kg

Thermal Conductivity of Liquid at 25°C

74.2 mW/(m.K)

Thermal Conductivity of Vapour at 25°C & 1.013bar

13.8 mW/(m.K)

Surface tension at 25°C

8.88 mN/m

Viscosity of Liquid at 25°C

0.190 mPa.s

Viscosity of Vapour at 25°C & 1.013bar




0.012 mPa.s

Specific heat of liquid at 25°C

1.386 kJ/(kg.K)

Specific heat of vapour at 25°C and 1.013bar



0.8890 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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