... and corona resistance protective layer of large tractive motor, conversion motor, wind driven generator, special motor etc.I ... as wrinkles,tears, gels, blisters, bubbles, pinholes and foreign impurities.III The thickness and its toleranceUnit:mm TypeToleranceTY6051- ... Remark: The test method comply to GB/T21707-2008frequency conversion speed regulation special use 3 items asynchronous motors insulation ...