EV Cooling Fluids

We are experts in the manufacture of low viscosity Group V ester base oils. We develop novel dielectric cooling fluids for safe and effective immersion cooled EV battery and drivetrain systems. 

Our dielectric product offering is marketed under the Priolube™ EF brand representing high-quality, high-performance base oils designed to create cooling fluid formulations specifically designed for electric vehicles.

What is a dielectric fluid?

A dielectric fluid is an electrically non-conductive liquid that has a very high resistance to electrical breakdown. These fluids are typically used to cool and insulate electrical components. 

This method of cooling is more efficient than alternative methods - such as forced air cooling - as the thermal conductivity and specific heat capacity of the liquid is higher than that of air, making the fluid more efficient at removing waste heat. In electric vehicles, dielectric fluids can be used to cool the battery, electric-motor, power electronics and transmissions. The fluids must have high thermal conductivities and low viscosities to aid efficient heat transfer and pumping efficiency. 

Direct immersion cooling using dielectric fluids in electric vehicles

Driven by the need to electrify, the automotive sector is now focused on creating highly efficient, power dense and lightweight electric motors, batteries and power electronics. Effective thermal management is now the key challenge to overcome in unlocking maximum performance. Battery capacities are increasing and consumers desire even faster charging rates, increasing heat output which must be managed. 

We are world leaders in esters. When we set out to develop dielectric fluids for direct immersion cooling, we used our knowledge of ester chemistry to design molecules that would outperform alternatives. 

We have developed Priolube™ EF 3221 - a fully synthetic dielectric ester that has been designed, tested, and manufactured to meet high standards of electrical insulation and cooling performance. With full control over our manufacturing processes, we have engineered Priolube™ EF 3221 to be highly oxidatively stable, readily biodegradable with low viscosity, to help formulators optimize electric vehicle fluid formulations. 

We have new products in development and are creating dielectric coolants that have very low viscosity coupled with high thermal performance using improved chemistries to meet the new needs of the industry. In doing so, we want to establish close partnerships with our customers to develop market leading materials for next generation fluids. 

With over 70 years' experience in tribology and lubrication, our capabilities are aligned to help you meet your goals in next generation fluids. 

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