Re: Colored HDPE (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Fri, 21 Sep 2007 20:19:10 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Colored HDPE (fwd)

Hi Matt,

Colors have been talked about forever. The old argument of "carbon" used 
for color. I believe there are probably some colored plastics that are 
higher in conductivity than others, but I've not ran across it myself. 
Even my 4" coil which is amazing is wound on black pvc and I've yet to 
have a "form" issue.

Well, I did catch the darn coil on fire last week due to the bottom two 
turns shorting. I've since unwound 5 turns, resanded the whole form and 
it's waiting for me to hook up the coil spinning mechanism for a recoat. 
That was due to too much power. I got carried away of course (200mA 
supply running too long and a high coupling). Funny, even with the 
flames the dumb thing was still throwing 5 foot sparks. I actually ran 
it about 5 times after the first fire. Good sparks and a fire each time 
although by the last run, the sparks shortened considerably (and the 
flame grew considerably).

There was a discussion just before Terry left the list about 
contaminants in forms. I think this proved out to be the more concerning 
issue. Some of the contaminants are metals. I don't know how to tell the 
difference other than measurement however. The same is true for any form 
including sonotube. I think with any form, inner and outer prep work is 
probably a good practice just in the event you stumble upon a lesser 
quality form.

Take care,
Bart

Tesla list wrote:

>---------- Forwarded message ----------
>Date: Fri, 21 Sep 2007 18:47:23 EDT
>From: Mddeming@xxxxxxx
>To: tesla@xxxxxxxxxx
>Subject: Colored HDPE
>
>Hi All,
> 
>    I recently acquired several sheets of  0.25"  HDPE. Some are white, some 
>red, and some are black. Does anyone KNOW if there is  a difference in 
>electrical conductivity between different colors of HDPE as  there seems to be 
>between different colors of PVC? 
> 
> 
>Thanks,
> 
>Matt D.
>
>
>
>************************************** See what's new at http://www.aol.com
>
>
>
>
>
>  
>