> Polystyrene is a bit better than teflon: my handbook lists a DF > of "<0.0001 @ 10^6 cycles per second)" compared to "<0.0002" for > Teflon. Of course, which is the most "<"? > > Ed I agree Ed- Polystyrene is hard to beat. At one time I had large rolls of high density polystyrene at 0.005". Lost in the shuffle to NC I guess. Dale W4OP