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Fuel cell Coolant

Fuel cell powered engines, next to hybrid, batteries and alternative fuels, one of the possibilities for alternative propulsion. According to several studies, fuel cell will mainly be installed in buses, trucks, vans and some passenger cars. Some off road applications, like marine and stationary equipment, consider the use fuel cells as well, and even aircraft propulsion is being developed based on this method.

Meet Freecor® EV Micro 10: This coolant is not only designed to cool a fuel cell stack of a vehicle adequatly, but also achieves an extended life of the coolant and the ion exchanger!




Low maintenance intervals are critical for fuel cell applications. These are defined by the coolant life time. This, in turn is affected by the increase in electrical conductivity. Also, the lifetime of the ion exchanger is key. The ion exchanger maintains the coolant below a critical electrical conductivity level by ‘filtering’ out all the corrosion and foreign ions that might be released during operation. Having a coolant which protects against corrosion, will enhance the life time of the ion exchanger, and will decrease maintenance intervals significantly.

In addition, fuel cells generate much more heat than an internal combustion engine of the same output power rating. This means your coolant needs excellent oxidation prevention next to an excellent heat transfer.

Because conductivity is extremely low, below 5µS/cm (vs >2500µS/cm for a typical MEG based coolant) and its special additives, the coolant is available as a ready mix only.

With our new fuel cell coolant Freecor® EV Micro 10, we are offering you 5-fold protection through:

  • Frost protection
  • Boiling protection
  • Electrical conductivity stabiliser package
  • Oxidation protection
  • Corrosion protection

The multiple protection makes this coolant unique in the market. It’s the state of the art.

Do you want to learn more about our new coolant Freecor® EV Micro 10? Your Local Area Sales Manager will be happy to present you more details.




Frequently asked questions

What is Electric Conductivity?

Electrical Conductivity (EC) or specific conductance represents the ability of a matter (solid, liquid, gas and plasma) to allow the transport of charged particles. A high EC indicates a material that readily allows electric current.

EC is commonly signified by the Greek letter σ (sigma), but also κ (kappa) and γ (gamma) are sometimes used. The SI unit (International System of Units) of EC is Siemens per meter (S/m), whereas for engine coolants and heat transfer fluids (HTFs) µS/cm is often used.

In electrolytes such as an engine coolant or HTF, electrical conduction happens by ions - which is the collection of anions and cations - traveling, each carrying an electrical charge. The conductivity of ionic solutions/electrolytes varies with concentration of ions and temperature. Think about distilled water as an almost insulator whereas salt water is a reasonable fair conductor. 

As can be understood from the above, the quality of the dilution water itself (linked to the total ion content) plays an important role in the EC of the coolant. Secondly, the inhibitor  technology is affecting the EC level as well.  And in addition, when the coolant or HTF is circulating in the system it might pick up remnants from machining and other contaminants, all having an impact on the overall EC. It is therefore incorrect to deduct from the EC value the dilution ratio of an engine coolant or HTF.