FR3 Natural Ester Transformer Fluid

FR3 Natural Ester Transformer Fluid


Today, protecting our environment and converting to a more sustainable economy are essential to everyone's well-being. Envirotemp™ FR3™ fluid from Cargill offers customers the benefits of a leading transformer insulating coolant that also helps contribute to these universal goals.

With FR3 fluid, our customers can:

  • Gain cost efficiencies either on initial cost or total cost of ownership without sacrificing reliability.
  • Extend transformer insulation and asset life.
  • Optimize load capacity.
  • Significantly improve fire safety.
  • Enhance their environmental footprint and sustainable supply chain initiatives.
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Use FR3 fluid to gain cost efficiencies and more reliable, effective transformer systems

There are many nuances to evaluating total cost of ownership and each organisation is different. We believe there are a number of ways FR3 fluid can impact your transformer performance and bottom line. Find out what value could FR3 fluid offer your organization.

FR3 fluid's high temperature capability enables smaller, more effective transformer designs with increased loading flexibility

The high temperature insulation advantage works for both new and retrofilled power and distribution transformers.

FR3 fluid extends insulation life 5-8x longer than mineral oil for improved reliability and total cost savings

The number one factor that has the greatest impact on the life of a transformer is the insulation paper.  FR3 fluid is proven to protect the insulation paper 5-8 times longer than mineral oil.  That extends asset life, reduces total cost of ownership and improves grid reliability.


As a FM Approved, less flammable fluid, FR3 fluid has the highest fire point of any dielectric fluid and has a flawless fire safety record.

Each utility’s’ main goal is to provide safe, reliable and affordable energy to the consumers and communities they serve. Envirotemp™ FR3™ fluid can play an important role in helping to achieve those goals.


FR3 fluid has best-in-class environmental properties: renewable, ultimately biodegradable, carbon neutral, and so much more.

FR3 fluid is made from renewable vegetable oils originating from plants which actually sequester CO2 during the crop growing process. Through lifecycle analysis, FR3 fluid has been shown to produce 56x less carbon emissions than mineral oil and is essentially carbon neutral.

FR3 fluid always delivers on dielectric performance, even in cold temperatures.

FR3 fluid has 10x the water saturation level of mineral oil, thus maintaining dielectric strength even in sub-zero temperatures.

All fluids oxidize but it takes years

In sealed applications, FR3 fluid does not sludge like mineral oil, thus maintaining dielectric strength and reducing maintenance costs.

natural ester oxidation fr3 transformers

Dissolved Gas Guide for FR3 Fluid

Dissolved gas determinations are taken and analysed and the data interpreted using much the same procedures and techniques as those used for mineral oil. 

Some of the differences include gas solubility, as well as some gas levels produced including ethane, hydrogen and acetylene.

Discover all the similarities, differences and methods of interpretation in the useful guide from Cargill, along with several other important resources on DGA for FR3 and natural ester fluids.

FR3 Technical Resources

FR3 Resources

Browse through articles, case studies, white papers and more from across the globe.

Retrofilling with FR3 Fluid

For more detailed information on retrofilling with FR3 fluid and natural esters, go to our dedicated page.