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Re: Sealing Plexiglas



Greetings,
   I have a 4 in. secondary made of 1/8 in. wall acrylic. I wound this
almost a year ago and painted it with polyurethane. It shows no signs of
cracking or discoloration anywhere yet. I run it on a 15 Kv -at-30 ma. NST and
make 24 in. sparks. Maybe the form will breakdown at higher voltages, but it
works fine as it is.
Later
George Stein
----- Original Message -----
From: Tesla List <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, December 09, 1999 1:13 PM
Subject: Sealing Plexiglas


> Original Poster: Ted Rosenberg <TRosen1-at-Tandy-dot-com>
>
> Robert: I think you probably wore out the Spell Check Dictionary. But it
> seems I have some testing to do. Perhaps plain, old, (really not too old)
> varnish? I'm guess here folks.
>
> Has anyone actually sealed a secondary on Plexiglas with a 'material' that
> worked? if so, what and where and how much (US$ please). My head is
spinning
> more than the winding jig at this point.
>
> Ted
>
> Original Poster: "ROBERT CRESSLER" <59CREROB-at-MENASHA-dot-com>
> <snip>
> I quote form "Plexiglas Handbook" by Rohm & Haas  (from 1966 oldie but
> goodie!)
> Plexiglas(acrylic: cell cast) chemical properties
> "In general, Plexiglas is unaffected by most inorganic solutions, mineral
> and
> animal oils, and low concentrations of alcohol. Oxidizing acids affect the
> material only in high concentrations; and it is unaffected by paraffinic
and
> olefinic hydrocarbons,amines,alkymonoalides,and esters containing more
than
> ten carbon atoms.
> Lower esters,aromatic hydrocarbons,phenols,aryl halides,aliphatic acids
and
> alkyl polyhalides usually have a solvent action"
>
> (Whew! tough on spell check)    sooo,yes I suspect the solvent in the
> polyurethane will have a solvent action and (probably) cause  some type of
> crazing. more so on extruded
> acrylic tube
>
> Robert
>
>
>
>