Abstract
Impulse and dc breakdown strengths of 4 /spl mu/m thick poly-p-xylylene (PPX) films were 5.9 and 4.1 MV/cm, respectively. They were independent of temperature in the temperature range from /spl minus/60 to 60/spl deg/C. dc prestressing for a long time (t/sub p/=60 s) reduced impulse breakdown strength for both the same and the opposite polarity. But dc prestressing for a short time (t/sub p/ >
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