DS DS/EN 50353
DS DSEN 50353 2002-APR-16 nsulatng ol - Determnaton of fbre contamnaton by the countng method usng a mcroscope
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This European Standard specifies two methods for determining the fibre contamination of mineral insultaing oil used in electrotechnical equipment, based on filtering a sample of oil and examining and counting the number of fibres on the surface of the filter using an optical microscope.