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Re: Where do I find POLYETHYLENE 30-60mil thick, for caps?
From: Alfred A. Skrocki[SMTP:alfred.skrocki-at-cybernetworking-dot-com]
Sent: Sunday, October 26, 1997 2:10 PM
To: Tesla List
Subject: Re: Where do I find POLYETHYLENE 30-60mil thick, for caps?
On Sunday, October 26, 1997 5:13 PM Adam
[SMTP:absmith-at-tiac-dot-net] wrote;
> I went to Home Depot today, to search for materials to make the Burt Pool
> type caps, and polyethylene sheets, as described, were not available.
> Where should I go for these 4x8x30mil sheets. I am thinking of using
> 30mil (if avail) three layers deep, for a total of 90mil. My coil will
> be fed with 12-15kV from parallel'd neons or a pig.
The thickest polyethylene you are going to find in any of the home building
supply centers is about 6 mill, for thicker stuff you have to go to
the plastics supply houses and you will pay a bundle! Frankly I don't know
why you would want to use such thick sheets, for it is better in the long
run to build several capacitors of higher capacitance from a few
thicknesses of thinner polyethylene (put kraft paper in between each to
wick up the mineral oil and exclude air bubbles) and connect them in
series to get the voltage tolerance you need. That is how the commercial
pulse capacitors are built.
> Also unavailable was the thin non-sch40 PVC tubing 6" in dia. I must
> keep looking for that.
For 6" and up PVC you have to go to the industrial plumbing supply houses
or better still find an industrial plumbing contrator and ask about their
scraps, you may get what you need for free.
> Last item: Mineral oil. I estimate needing about 5gal for all three
> caps. I need a source for the pure stuff in the Boston area. Any
> suggestions on what *type* of place I need to look?
One of the cheapest and most overlooked sources for mineral oil is the
veterinary supply houses, next up in price is machine shop supply houses
(they sell it for use as a cutting lubricant for lathes and milling
machines) next up the price ladder is the petroleum suppliers (Exon,
Gulf, ect) then the industrial chemical supply houses and the most
expensive is from the pharmaceutical supply houses and the electrical
suppliers ie. transformer oil.
> Is there a 'materials' FAQ for this group? I just signed on, and did
> not receive any FAQs- its unusual for a listserv to not send one as
> the first message.
The lists archives are located at;
ftp://nic.funet.fi/pub/sci/electrical/tesla
and Chip Atkinson (the list owner) has a web site with info about the
list at;
http://www.pupman-dot-com
Sincerely
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Alfred A. Skrocki
Alfred.Skrocki-at-CyberNetworking-dot-com
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