Trusted by leading companies all over the world

Companies we work with


We are the world leader in ester fluids for transformers. And we have the technical experience and credentials to prove it.

In the 1970s, we recognized the need for an alternative to mineral oil. One that could combat flammability and low moisture tolerance, while delivering environmental safety. MIDEL was the result.

Proven performance in thousands of transformers worldwide. But it’s our technical excellence and years of experience that really sets us apart.

Together with our manufacturing partner, Valtris Specialty Chemicals, we guarantee unparalleled supply and service anywhere in the US.

Welcome to a new world of choice.

MIDEL Safety Inside


What can MIDEL ester transformer fluids do for you?

  • Safeguard your transformer – with a high fire point (>300°C), safety is maximized.

  • Protect the planet – fully biodegradeable, environmentally safe.

  • Take it to the max - up to 20% overload allows your transformer to run harder or for longer.

  • Superior moisture tolerance - to extend the life of your transformer.

  • Nov 13th, 2017
    Manchester, UK – Nov 13, 2017 – M&I Materials has expanded its global reach by opening an office in South Africa and securing a manufactur...
  • May 5th, 2017
    Blue Mountain ski resort in Ontario, Canada has powered up a new transformer filled with MIDEL 7131 synthetic ester liquid that helps mitigate the ris...
  • Nov 8th, 2016
    As urban populations across the world continue to soar, the demand for power is now overtaking distribution capacity, putting increased pressure on ex...