“This test method covers the determination of specific resistance (resistivity) applied to new electrical insulating liquids, as well as to liquids in service, or subsequent to service, in cables, transformers, circuit breakers, and other electrical apparatus.”

(Quote from ASTM D1169-19)

What method is used to analyze the sample?

ASTM D1169

IEC 60247

How do you interpret the results?

IEEE C57.106-2015

What do the results indicate?

“The resistivity of a liquid is a measure of its electrical insulating properties under conditions comparable to those of the test. High resistivity reflects low content of free ions and ion-forming particles, and normally indicates a low concentration of conductive contaminants.” (Quote from ASTM D1169-19)

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