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Which plastics are sunlight-resistant?

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Posted by Paul Ciszek on December 1, 2006, 8:28 am
 
A guy I know is looking for a good sun-resistant plastic for a
homemade radome.  This is in Colorado, where the UV is extra-brutal.
Since he isn't using it for solar collection, transparency is not an
issue.  However, the usual method of making a plastic light-resistant
is to add carbon black, which makes the plastic absorb in the RF
range.  I figure if anyone knows which plastics hold up to sunlight,
these two newsgroups would.

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Posted by SJC on December 1, 2006, 3:20 pm
 


  You could ask plastic distributors, they have application groups.
It is my understanding that acrylic is reasonably UV resistant.
http://sdplastics.com/



Posted by TKM on December 2, 2006, 2:38 pm
 

Yes.  Acrylic is the long-time favorite of the plastic sign industry for
long service life.  Sign companies or plastic distributors in your area can
help you since they are familiar with local conditions.  Other plastics,
such as polycarbonates (GE "Lexan") also come in various forms some of which
are UV stabilized.

TKM



Posted by Jeff on December 30, 2006, 2:53 am
 TKM wrote:

   I think the usuual way to is treat one side of the polycarbonate.

   We discussed this not long ago in alt.solar.thermal and acrylic has a
natural UV resistance, just about everything else must be stabilized.
And the great thing is that acrylice is so available!

   Note that acrylic is generally not used in solar collectors because
of it's temperature limitations, which won't affect the op.

   Jeff



Posted by nicksanspam on December 30, 2006, 8:54 am
 

Does it come thin, in 0.01 inch x 4-foot wide rolls, like polycarbonate?

Degusa twinwall acrylic seems to last a lot longer than Therma-glas Plus
twinwall polycarbonate ($1 vs $/ft^2), with better transmission and
U-value, but it seems to cost 5X more ($1 vs $/ft^2 or less), partly
because it comes from Germany.

Nick


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