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Actually....

Posted by Jon Risch on October 25, 2009 at 18:56:24:
A wrote:
"Solid Teflon has a high dielectric constant, which slows the propagation of electrical signals on the cable."

Not really, if you compare solid teflon to almost ANY of the other solid dielectrics, it has the lowest dielectric constant, of about 2.1
Polyethylene is about 2.4 to 2.3, depending on the exact formuation used, since cable insulators are usually NOT a completely pure form of the plastic. Teflon is one of the exceptions.
PVC ranges from 3.5 to 7 or even higher.
Polyurethane ranges from 3.5 to 5 or 6
Polypropylene ranges slightly lower than polyethylene.

A foamed FEP teflon ends up even lower, as low as 1.5 or 1.6, and yes, this is good in terms of reducing the already low dielectric involvement of the teflon with the audio signal.

Some folks like foamed PE's sonic signature better than foamed FEP, and I think they are responding positively to the slight warmth that PE has compared to teflon, but in my opinion, the PE is further from neutral than the teflon.