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Secondary coil form questions




Hello,

I am a Tesla Newbie!  (Don't look so shocked, and pardon the pun. <g>)  I
intend to fix that very soon though, I am collecting information and
materials right now for my first real coil.

I've found plenty of wonderful information on the Web and here, but there
are a few things I'd like to understand better, if anyone can answer these
questions.

I know PVC is a cheap and available coil form, but has high RF loss and
absorbs water.  I've heard that there are far better materials, like
Plexiglas, polyethylene, ABS, etc.  Fortunately, I am blessed with a local
supplier that carries most of these materials.  My question is, given a
choice of any material, which would be *the best*?  Second best?  If I use
one of these materials, can I skip the drying/sealing phase which PVC needs?
I'd especially like to hear from people who have used these materials in a
real working coil, so I can find out the particular quirks of the material
(like if certain sealants have problems adhering to them, brittleness, etc.)

Another thing I've heard is that the coil form should be made of the
thinnest material possible, but I've never heard why this is desireable.  If
the coil form should be as thin as possible, should the coatings on the form
or windings also be as thin as possible?  Or is thickness the goal there?

Thanks in advance,
Chris C.