Having used Dow Corning 300 Silicon Oil and Silicon High Voltage Insulation, the two silicones aren't compatible. So it's easy to see why one would/could have seal problems where the seals weren't meant for, but were used with silicon compounds. The problems I encountered were swelling, not shrinking.
Base stocks of some full synthetic oils are Poly Alpha Olephin which is also used as an excellent, benign, high voltage dielectric and thermal conveyor. Difference in that use and other uses are the pressure tolerance and other specific usage additives added to them.....so was told me by my product sales/field engineer.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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