At 01:29 PM 7/31/2003 -0700, Bob Axtell wrote:

>Look up LEXAN from GE, I believe. They sell the IR material. It has a purple tint to it, and visible light CAN'T penetrate it.

You can use most any dark dye, just make sure it dosen't have a lot of Carbon.
I got that advise from Polaroid, when researching this for a project.
They tell me that except for carbon, it's pretty hard to block IR in Lexan or ABS.

I once got some "white" abs that was supposed to be IR opaque, (the original samples were!) but the production material wasn't quite the same color, and was basically like frosted glass to IR. Transparency around 90%.

You could just barely see sunlight through a 1mm section.

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads