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Poly Caps




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From:  Larry Bud Melman [SMTP:gasman-at-althea.a-line-dot-net]
Sent:  Thursday, July 02, 1998 12:55 AM
To:  Tesla List
Subject:  Re: Poly Caps

> > Richard Quick states in one of his documents:
> >
> >         "The best dielectric for homemade Tesla capacitors
> >         is low density polyethylene plastic."
> >
> > Now my plastic supplier has easier access to "high density" P/E.
> >
> > 1. Is this better / same / inferior for pulse cap construction ?
> >
> > 2. Is the dielectric constant the same (ie. stated 2.2 but use 2.0 for
> home
> > caps)  ?
> >
> > Many Thanks,
> >
> > Mark
> >
> > ___________________________________________________________
> >
> > Mark Finnis                     Hm:  61 8 82895205
> > Staff Specialist                        Wk:  61 8 82224000
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> > www.health.adelaide.edu.au/icu
> > ___________________________________________________________
> 
>   HDPE is better, but more expensive and a real bear to cut and roll
> compared
> to low density stuff.  Polypropylene is better than polyethylene but
> marginally
> and is again more expensive.
> 
> Richard Hull, TCBOR



	Some large diameter pipe is available, constructed of HDPE.  I've
been having a bit of trouble finding a coilform for a large coil I have in 
the works, and I've just become aware of this.  I'll bet HDPE is an absolutely 
ideal coilform material.  I'm going to do a sec'y in the 16 - 20 inch range,
about 48-60 in tall.

	If no one is aware of probs with HDPE coilforms, I suggest that 
those of you looking for larger coilforms try commercial pipe shops
specializing in sewer mains...that's where I found some.  Unfortunately,
I'm still looking for an appropriate scrap (it comes in 40 foot lengths...
:-(

Also tends to be thick-walled and very heavy; one example of a 20 inch
specimen had a 0.6 inch thick wall, and the guy said it was 16 lbs/foot!!
On this basis, it might be a bit impractical unless one could find thinner
stock.  Anybody out there finding large diameter PVC??

						Clay