PVC is fine for a secondary if it is solid and not "foam-core". Foam-core is very light for its size and viewing it from the end looks like Styrofoam sandwiched between two thin layers of hard plastic. This type has water retention problems. Some pipe colorants contain carbon particles which make them inconveniently conductive. I believe the pipe you describe, if solid, should work fine. Just remember to remove all lettering and markings from the outside of the pipe as the black lettering is usually loaded with carbon. Acetone works fine for this, just to it outdoors as the fumes can give you a powerful but unpleasant "buzz".
Matt D
-----Original Message-----
From: David Boyle <twoten@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Thu, Apr 10, 2014 4:59 pm
Subject: [TCML] secondary tube wall thickness
I have a nice long piece of turquoise pvc pipe. It's almost 7" in
diameter, but the wall thickness is pretty thick at 10mm or a bit over
3/8ths. Will the rf losses make this a dud for winding on a secondary?
And is pvc an undesirable material to begin with? Thanks in advance for
your help!
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