Electrical insulation accelerated tests

Accelerated tests usually require the application of a higher electrical stress (voltage) coupled sometimes with an increase in temperature as a second accelerating factor. As in all accelerated testing, care must be taken to ensure that this does not introduce ageing mechanisms different to those that occur in service. The most common relation used to predict insulation life in the presence of partial discharges is the power law ... 

Results of accelerated testing of circuits prepared with this polymer as the dielectric layer are satisfactory. Circuits comprising two metallization and one polymer layer withstand a minimum of 500 cycles from -40 to +130 C with no loss of adhesion, cracking of the polymer, or open circuits. No mechanical or electrical failures occur during 1000 hours at 150°C in air, and the insulation resistance remains above 200 megohm during 500 hours at 85 C/85% RH/60 V (THB). Tantalum nitride resistors under the polymer change < 0.5% under these THB conditions. 

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