Re: Plastic

[Chris Browning <hvac25000 at yahoo_com>]

Lexan is what bullet-proof glass is made out of, is it not? Don't you think bullet proof glass is not only bullet proof, but probably scrathproof, more than acrylic, to a point? My father is a machinest, medical engineer to be specific, and all he works with is plastic, and the occasional aluminum or steel. Last time I checked, neither acrylic nor lexan will warp due to absorbation of water, it warps due to heat. Yes it may dry out after time and become brittle and that may even warp it, but it can't absorb extra water and warp.
 
Chris


Erny May <emay1 at wi_rr.com> wrote:
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" 
To: 
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" 
> > To: 
> > 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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