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Parabolic Troughs for DIY High-Temperature Projects - Page 3

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Posted by Lee on November 28, 2006, 10:18 am
Hi Folks,

It's interesting to hear that you mention alluminium printing plates
because I was thinking of using them but maybe they wouldn't be
reflective enough.   I am currently using Mylar.   I can't complain
about the reflectivity of it but I've only had it a couple of months
and it's already deteriorating.   It could be the way I've glued it.
There seems to be a lot of expansion in either the Mylar or the
Corflute sheeting I'm using when it heats.   I am using a thin Mylar
film.   I might be better with 2 mil or thcker or laminating the film
behind Polycarbinate sheeting or something.



Morris Dovey wrote:

Posted by SJC on November 29, 2006, 4:40 am

  I used the 5 mil silvered both sides stuff from mirrorsheeting.com.
I never glued it to anything, I just laid it in forms for testing. I took
frozen water to steam in 20 minutes with a 20" x 4 foot trough in
30F ambient at Lake Tahoe. That convinced me that it really "cooks" :)

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