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FR3® natural ester dielectric fluid: Leading the way

Benefitting utilities and businesses, to better protect and serve communities.

Contact Us Find FR3 Fluid

FR3 logoFrom its very first validation tests over 25 years ago to the latest installations of FR3-fluid-filled power and distribution transformers across the globe, FR3 natural ester dielectric fluid has led the industry. FR3 fluid enables more cost-effective, more resilient, higher-performing, safer, and environmentally better ways to power how communities live, play, work, and thrive.

Although mineral oil has long been the fallback transformer oil, it simply isn’t the optimal dielectric fluid. In millions of installations worldwide, FR3 natural ester dielectric fluid has proven to be superior in the ways you value the most. We have the leadership, experience, and proof, so you can be sure to take advantage of FR3 fluid’s benefits.


Why FR3 Fluid

FR3 fluid outperforms mineral oil in overall cost savings, grid resiliency, transformer performance, fire safety, and environmental benefits. See why these critical reasons to switch from mineral oil to FR3 natural ester transformer oil matter.



FR3 fluid has been tested and proven by numerous internal tests, third-party research organizations and universities, and customers many times over, and for decades. See why its superiority to mineral oil is beyond question.


Featured Applications

Bio-based FR3 fluid is the smartest choice in dielectric fluid for power generation and distribution transformers of all voltage classes. Discover how its unique properties deliver proven benefits to these featured applications.

Power Transmission & Distribution Solar Power Wind Power Retrofilling

FR3 Fluid Technical Details

Higher flash and fire points (compared to mineral oil). Dielectric strength even at very cold temperatures. Chemical interactions that extend the life of a transformer’s solid insulation. Ultimately and readily biodegradable. See FR3 fluid’s technical details.



Browse or search our resources to find technical perspectives, white papers, customer-story videos, FAQs, and interactive tools, including our extended life cost savings calculator, SKU reduction calculator, and higher thermal capacity graph.


Tata Case Srtudy

“When you have less space, and more population in that area [like in Mumbai, India], it means you need to have a solution that is very safe.”

Ramchandran Pillai, Chief Corporate Operations T&D, Tata Power Co., Ltd.

Related Resources

Natural Ester Oil Transformers Deliver Greater Peace of Mind

Read why utilities are transitioning from mineral oil to FR3 dielectric fluid to meet energy demands and reduce environmental risk.


Evolution of Natural Ester Transforms Industry Norms

Read about the practical results that utilities around the globe are gaining by switching from mineral oil to FR3 fluid.


FR3® Dielectric Fluid Brochure

Get an overview of FR3 natural ester dielectric fluid and its benefits.


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