Re: Plastic

[Wright Huntley <jwwiii at pacbell_net>]

Interesting, for "Lexan" *is* GE's brand name for polycarbonate. I suspect 
your Midland guy is ill informed. See http://www.gelexan.com/gelexan/.

I have used it, without any sign of warping, as tank covers. I just avoid 
it as being way too expensive (unlike your source). GE apparently had a 
bunch of patents, so it was the *only* brand of clear polycarbonate for 
many years.

Polystyrene, which can also be clear, doesn't seem to warp, either, even 
in the very thin sheets used as ceiling lamp covers. They are cheap, and 
the crackle, bumpy finish passes as much light as smooth sheets while 
being somewhat stiffer.

Wright

Erny May wrote:
> Wright,
>
> According to the engineer at Midland Plastics, it is NOT Lexan. I have used
> Lexan  and it has warped, not as quickly as acrylic which, depending on
> thickness, can do it in less than 24 hours. Lexan of the same thickness
> takes 48 hours.
>
>                                                    Erny
> ----- Original Message ----- 
> From: "Wright Huntley" <jwwiii at pacbell_net>
> To: <killietalk at aka_org>
> Sent: Tuesday, August 12, 2003 11:58 PM
> Subject: Re: Plastic
>
>
>
> > It's best known by the brand name "Lexan." It is available at most
> > hardware stores as unbreakable glazing material. [It is rapidly becoming
> > the window of choice at mandatory government schools.]
> >
> > It does not absorb water, hence warp, nearly as much as acrylic. Another
> > cheap source is as covers for ceiling fluorescent fixtures. Sold in 2X4
> > sheets, it is easy to cut with a straight edge and draw knife to fit your
> > tanks. Some are polycarbonate and others are polystyrene, but they don't
> > warp like acrylic (plexiglas).
> >
> > Wright
> >
> > Erny May wrote:
> >
> > > Hello All,
> > >
> > > I thought some of you might be interested in this; I found a plastic
>
> that is
>
> > > not subject to warping when exposed to moisture. Ran into it when I
>
> tried
>
> > > to use "WELD-ON" to glue two pieces. It is polycarbonate and has a
> > > wear resistant coating; can't be glued using acrylic cement and makes it
> > > moisture proof. It goes by the names of "Hyzod" and Tuffak". I get it
>
> from
>
> > > Midland Plastic; they sell their odds and ends for very reduced prices.
>
> I
>
> > > got about 50 pounds of sheet plastic for $20. Plastic firms in your area
> > > may be doing the same thing. In every other aspect it behaves like
>
> plastic;
>
> > > machines like it, but it has an almost glass like sound when you tap it.
>
> It
>
> > > is great for tank covers!
> > >
> > >                                           Erny
> > >
> > >
> > >
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>
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> > --
> > Wright Huntley -- 760 872-3995 -- Rt. 001 Box K36, Bishop CA 93514
> >
> >
> > Physics is the study of frictionless elephants whose masses may be
>
> ignored.
>
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--
Wright Huntley -- 760 872-3995 -- Rt. 001 Box K36, Bishop CA 93514


Physics is the study of frictionless elephants whose masses may be ignored.




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