Re: Colored HDPE (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Fri, 14 Sep 2007 14:15:44 -0700
From: Dr.Hankenstein <Dr.Hankenstein@xxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Colored HDPE (fwd)

Put a sample of the unknown material in your microwave and "cook" it for
about a minute (don't forget to put a glass of water in with it to protect
the oven); if the RF of the oven makes it get hot, don't use it. 

Regards,
Henry


> [Original Message]
> From: Tesla list <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx>
> Date: 9/21/2007 9:27:54 PM
> Subject: Re: Colored HDPE (fwd)
>
>
> ---------- 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
> >
> >
> >
> >
> >
> >  
> >
>
>