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Midel Synthetic Ester

What does it do?

Midel is the world’s leading brand of ester-based dielectric fluids and is chosen by utilities and transformer manufacturers worldwide because of its excellent track record and ability to minimise risk.


Things to remember

Midel 7131 is a synthetic ester which provides a enhanced fire safety and environmental protection properties over that of mineral oil. Synthetic esters have been successfully used in new and retrofitted liquid-filled electrical equipment installations for many years.

Midel has different cooling properties to mineral oil so when retrofilling a transformer that had previously contained mineral oil EOS recommends you check to ensure the transformer will be adequately cooled.

Where mineral oil saturates with water at around 50ppm, midel is typically 2000ppm at 20 degrees. A “normal” water content can be 100- 200 ppm.



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