Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <FutureT-at-aol-dot-com> Justin, Polypropylene, polyethylene, and polystyrene are excellent in mineral oil or transformer oil, with an aluminum foil or aluminum flashing dielectric. Mica is excellent too if you get the good stuff; esp. quality ruby mica which costs a fortune. John Freau