11. November 2017

R1234yf Refrigerant

R1234yf Refrigerant as an alternative to R134a in normal refrigeration systems

The refrigerant R1234yf is a low-flammable replacement refrigerant for  R-134a in new plants and has a global warming potential ( GWP ) of less than 1. R1234yf is an HFO (hydrofluoroolefin) refrigerant. 

It is suitable as a replacement for R-134a in commercial and industrial standard refrigeration systems with positive displacement compressors and direct evaporation. The thermodynamic properties differ only slightly from R134a, so this refrigerant can be used without major changes for new plants. It is classified according to ISO / ASHRAE in the safety class A2L (hardly flammable) and therefore allows significantly higher quantities than other flammable refrigerants.

With its GWP value of less than 1, R1234yf falls below the limit of 150 set out in the F-Gas Regulation 517/2014 and the Ecodesign Directive. This is not the phase-down scenario foreseen in the F-Gas Regulation affected, because no CO2 equivalents are counted towards the quantity of refrigerants placed on the market for this refrigerant . R1234yf is a low-flammability class A2L refrigerant. The permitted capacities, system configurations and guidelines for safe handling for the respective applications can be found in the applicable regulations and standards for your region, eg. PED, EN 378 or ISO 5149.


Technical specifications

ASHRAE number


Composition in % 

R-1234yf 100%

molar mass

114.04 g/mol

Boiling point at 1 atm (101.3 kPa)

-29.5 °C

critical temperature

94.7 °C

Liquid density at 21.1 °C

1106 kg/m³

GWP (CO2 = 1,0)

<1 (4)

ASHRAE safety class





6,2 Vol.-%

Burning rate at 23 °C

1.5 cm/s


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