Re: Form Material Info!!!

["Steve" <Steve-at-g8cyerichmond.freeserve.co.uk> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

You are correct about ABS. What we call perspex in the UK is methyl
methacrylate polymer, not the same thing as polycarbonate, although for most
purposes it doesn't really matter. The key difference is how you join the
materials together. For ABS you can get a plumbers ABS solvent based cement.
For perspex there is a commercial cement by the trade name of Tensol. Tensol
is made from perspex dissolved in a solvent. I actually make and repair
perspex museum jars in my job and use perspex dissolved in chloroform. You
should be able to get hold of Tensol from any firm that supplies perspex.
Unfrortunately I have only found the larger diameter white ABS in small
lengths. Smaller diameters are available in 2 metre lengths from plumbing
suppliers.
Steve
----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, July 15, 2000 6:59 PM
Subject: RE: Form Material Info!!!


> Original poster: "Richard Barton" <richardbarton-at-caving5.freeserve.co.uk>
>
> I believe ABS means-
> Acrylonitrile Butadiene Styrene
> ....... but of course, I could be wrong!
> I have used this stuff for a secondary tube in the past.... it
> seems pretty ideal, but I've only been able to get in it short
> lengths, in white, in a tumble dryer wall venting kit.
> Are there such things as ABS drainpipes? Are those brown-
> coloured drainpipes made of ABS ?
> And perhaps you could tell me- is Polycarbonate, what we
> in the UK call "Perspex" ?
> Richard Barton.
>
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Friday, July 14, 2000 4:52 AM
> To: tesla-at-pupman-dot-com
> Subject: Form Material Info!!!
>
>
> Original poster: "Dan Kunkel" <dankunkel-at-hotmail-dot-com>
>
> Tesla Builders from afar,
>
> I came across this little nuggett of info that was tucked away in the
> archives from 94 or 95. I forgot who the original poster was and i am away
> from my personal computer. This is also a greatly condensed chart, the
> original one contained the dielectric constant at different frequencies,
and
> the breakdown voltage at differing frequencies and listed a whole bunch of
> materials including the RF specs for magnet wire coatings. For the sack of
> time i shall include the dissipation factor for a few common materials.
> This will put to rest any rumors and settle which plastic is best for
Tesla
> Coil operation. While one megahert is well above standard coil operation
you
> can compare it to 50 hertz to get an idea...
>
>        Dissipation Factor (x10^-3)
>
>        50Hz / 1MHz
> LDPE - .15 / .08             <high denstity polyethylene>
> HDPE - .24 / .20             <low density polyethylene>
> PP   - .40 / .50             <polypropylene>
> PVC  -  80 / 120 (yikes!!!)  <polyvinyl chloride>
> PS   - .1-.4 / .05-.4        <polystyrene>
> ABS  - 3-8 / 2-15            <I forgot what it stands for>
> PC   - .70 / 10              <poly carbonate OR lexan)
> PU   - 120 / 70              <polyurethane>
>   (linear)
> PU   - 50 / 50               <polyurethane>
>   (thermoset)
> PU   - 30 / 60               <polyurethane>
>   (thermoplas)
>
> As you can see pvc is about the worst material to use and coating it with
> polyurethane doesn't improve matters much at all. however i think that the
> magnet wire insulation affects dissipation much more than the secondary
form
> material. I don't have their numbers with me but they are all very lossy
> too. Supposedly teflon coated magnet wire is the best but i do not know
the
> RF dissipation values for teflon. but i can tell you that if you ever
manage
> to find any it will be expensive.
>
> Discharge Dan
>
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