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Energy Technologies
Automotive gear oils lubricated to allow for smooth driving of vehicles across a busy highway

Electric vehicle fluids

We are developing next generation base oils for gearboxes, e-axles and motors that can deliver low traction with excellent heat transfer/cooling as well as offer the tribological and electrical characteristics and associated no-harm data that is expected.  

Our ester-based fluids are ideal for formulating next generation motor, e-axle and gearbox fluids and lubricants for electric vehicles. Unlike traditional base fluids for automatic transmission oils, our esters have been specifically engineered for the requirements of electric and hybrid vehicles. Our chemistries are tuneable to your exact needs - get the best out of your future drivetrains by collaborating with us to develop fluids for your next generation drivetrains.

Our esters offer:
  • Outstanding traction performance – 40 - 120% reduction across a wide temperature range for very low drag within the gearbox or e-axle
  • Up to 100% biobased, non-toxic, biodegradable
  • Low electrical conductivity - allows charge to dissipate to reduce the risk of arcing & damage
  • Up to 95% improvement in oxidation stability for fill-for-life applications vs group III and group IV base oils
Contact us to discuss your requirement for cooling fluids or transmission fluids for electric vehicles.  
Cross section of an electric central drive gearbox and fluids

Marketing sheet: Our ester technology vs. grp III and IV base oils for EV gearboxes

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Close up of a technician with a gloved hand working on electric vehicle and battery cooling and thermal management

Contact us to collaborate

Next generation EV gearbox fluids

Are you an OEM, tier one supplier or lubricant formulator? Work with us to develop fluids and lubricants for your next generation gearboxes, e-axles and motors.
Contact us

How does the addition of a Croda ester affect the traction coefficient of a group III base oil?

traction coefficient graph

Figure 1: Traction tests at 75°C (all fluids adjusted to 5.5 cSt). 

Figure 1 shows a traction test where all fluids are at the same viscosity at standard operating temperature of 75°C. Our ester candidate neat has a viscosity of 5.5 cSt. All the other samples were made to the same 5.5cSt viscosity using a mixture of Yubase® 4 and Yubase® 6 group III base oils.

The green line represents an incorporation of 10% of the ester candidate and the orange represents incorporation of 25% of the ester candidate, respectively. Here we demonstrate a reduction in traction, even when controlling for viscosity, using our ester candidate, vs a neat group III oil.

Sustainability considerations

Alternative liquid coolants fluids, such as liquid perfluorinated compounds (PFCs) are cooling materials, but they have some significant environmental problems. For example, PFCs are relatively volatile and have a significant global warming potential depending on the exact boiling point. Further to this, they are non-biodegradable and so a source of pollution if accidentally released into the environment.

Compared to PFCs, our ester-based materials are non-toxic, non-bioaccumulative, expected to have no global warming potential and have the potential to be EU Ecolabel for lubricants compliant. A large range of our esters are on the EU Ecolabel lubricant substance classification (LuSC) list.

How can we help you formulate dielectric fluids? 

We have decades of experience in the formulation of ester chemistries and we are actively developing new products for use as dielectric cooling fluids. We are leaders in friction modification and ester base oils, our experience of both allows us to help you formulate your next generation of coolants and transmission fluids.  

We are actively researching this area and have some exciting products in development. If you would like to work with us, to create an ester base fluid for your electric vehicle, then please contact us.

How can we help you with your application needs?