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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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