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Re: Plastic
Of course Wright, the engineer who works with it daily is "ill informed".
As I stated, it is not just that it is polycarbonate, it is also "coated"
to
improve the "wearability" or abrasion resistance. Unless you have worked
with the stuff you can't appreciate the characteristics.
Erny
----- Original Message -----
From: "Wright Huntley" <jwwiii at pacbell_net>
To: <killietalk at aka_org>
Sent: Wednesday, August 13, 2003 9:05 AM
Subject: Re: Plastic
> 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
> >>>
> >>>
> >>>
> >>>---------------
> >>>See http://www.aka.org/pages/killietalk/subkillietalk.html to
> >
> > unsubscribe
> >
> >>>Join the AKA at http://www.aka.org/pages/join.html
> >>>
> >>
> >>--
> >>Wright Huntley -- 760 872-3995 -- Rt. 001 Box K36, Bishop CA 93514
> >>
> >>
> >>Physics is the study of frictionless elephants whose masses may be
> >
> > ignored.
> >
> >>
> >>
> >>
> >>---------------
> >>See http://www.aka.org/pages/killietalk/subkillietalk.html to
unsubscribe
> >>Join the AKA at http://www.aka.org/pages/join.html
> >>
> >
> >
> >
> >
> > ---------------
> > See http://www.aka.org/pages/killietalk/subkillietalk.html to
unsubscribe
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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.
>
>
>
>
> ---------------
> See http://www.aka.org/pages/killietalk/subkillietalk.html to unsubscribe
> Join the AKA at http://www.aka.org/pages/join.html
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