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reflective materials - Page 2

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Posted by Demitri on February 2, 2007, 7:27 am
 
teraniageoff wrote:


Mylar lasts only 2-3 years in the sun.
Anodized aluminum sheets; are they thin enough to glue them on a
satellite disk?
Non permanent glue would be the best.

Posted by teraniageoff on February 2, 2007, 9:36 am
 


This is the issue. i have used contact cement but even when very dry,
it still delaminates over weeks in the sun, unless the sheet is
distorted by panelbeating, and this destroys optical accuracy. This is
ok for cookers where a diffuse focus is an advantage so's you dont cut
your SSteel pots in half. But for heat capure in a cavity it is
hopeless.
The only solutions there seem to be is pulling a vacuum bag over the
lot and pull the sheet onto the dish with two-pot resin on it; or
press it into a dedicated mould in petals.

Non-permanent Glue?
seems that's already too easy.
regards geoff


Posted by Demitri on February 2, 2007, 4:44 pm
 teraniageoff wrote:

Sounds to complicate to me.
I guess I use just a better quality mylar the next time.
I don't mind the few wrinkles on the mylar.
The non permanent glues was good too.
It was good for some years in the sun.
I could replace very easily any damaged mylar.

Posted by Lee on February 2, 2007, 8:54 am
 I'm using Mylar for my solar trough.   Quite reflective but not very
durable.  It's starting to deteriorate after 3 months but I think that
could be due to me not getting a good lamination.   Still it's very
cheap.

Lee.





Posted by Demitri on February 3, 2007, 2:55 pm
 Lee wrote:


I used non permanent glue from 3M.
Comes in a spray dose.
It was good for years.
My mylar also lasted some years.
Cover up the disk with some material which can not be penetrated by the
sun when not in use.
That way the mylar lasts longer and it's also more secure.
Kids might want to play when you are not at home and start a fire
unwillingly.



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