Ball pressure temperature
It is represented as BPT when a φ5mm steel ball is pressed with a load of 20N for 1 hour in oil at the test temperature, resulting in a sample indentation depth of 0.209mm.
Electric Appliance Investigation Committee B Method (in oil) The BPT is defined as the depth of indentation of 0.209mm when a φ5mm steel ball is pressed against the sample with a load of 20N for 1 hour at the test temperature in oil. IEC60695-10-2 and Electric Appliance Investigation Committee A Method measure using a "balancing" jig in an oven. DJK only conducts measurements using Method B.
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