Hmmm...  I was looking for the opposite -- infrared
filter thru which regular red LED's are visible, but
my local plastic source said that they could not see
thru their infrared acrylic/polycarbonate.  Seems to
be just what you want though.

BTW, the reason I wanted visible infrared, is cause
I have a sample of infrared filter from PacTec that
seems to show red thru quite well, but is darker
than regular visible red acrylic (matches the OEM
filters in my car better), and is less glossy, so
better for in-sunlight viewing.

Oh, the local source is Austin Plastics 512-836-1025.

Cheers,
-Neil.



-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Rick Mann
Sent: Friday, May 10, 2002 2:14 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Source for IR-transparent plastic?


Hi. I need to make a window for a product I'm working that's opaque to
visible light and transparent to infrared. I've found many suitable plastics
but they're generally only available as resins, rather than sheet. Since I
only need a few tiny windows, I want to mill them out of a .250"-thick sheet
of acrylic or polycarbonate, but minimum order quantities that I've found
are around 7 sheets (36" x 48") @ $181 each. I found one place who'll sell
me a .125" sheet (4' x 8') for $250.

Does anyone know where I can get suitable plastic sheet, .250" or thicker,
2' x 2' (or thereabouts)?

TIA,

--
Rick

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