By continuing to use the site you agree to our Privacy & Cookies policy

Your browser seems to have cookies disabled. For the best experience of this website, please enable cookies in your browser.


Daimler needs to have the book thrown at it click here for editor’s view

Andrew Gaved, Editor

Your browser is no longer supported

For the best possible experience using our website we recommend you upgrade to a newer version or another browser.


Car researchers' final report on HFO 1234yf confirm it is 'safe to use in automotive systems'

The Cooperative Research Project Team from car engineering group SAE International looking into HFO 1234 yf has confirmed that the refrigerant is safe to use in automotive direct expansion air conditioning systems.

The SAE Cooperative Research Project Team said the estimated overall risk of vehicle fire exposure attributed to its use is nearly six orders of magnitude less than the current risk of vehicle fires due to all causes and also well below other risks accepted by the general public.

All OEMs in the new CRP have indicated agreement with these conclusions, SAE said.  The CRP members are Chrysler/Fiat, Ford, General Motors, Honda, Hyundai, Jaguar Land Rover, Mazda, PSA, Renault and Toyota.

The team said: “During numerous and frequent meetings, the CRP members detemined that the refrigerant release testing by Daimler was unrealistic in that it created extreme conditions that favoured ignition while ignoring many factors that would be present in a real-world collision. These factors include the potential dispersing effect of the engine cooling fan, the quenching effect of front end compartment deformation, the extinguising effect of steam released due to radiator breakage and the diversion of a refrigerant through a damaged condenser to the exterior of the engine compartment.”

Have your say

You must sign in to make a comment.

Related images



Register at to receive regular email updates

Find out more