Rick,

Vink (www.vink.com) is an European company that sells this kind of plastic.

I use a black type called Perspex 962, which is 5 mm thick. It is possible
to get it in different thickness'es.

As far as i remember they sell it in 2x3 meters sizes, but i am not sure if
you can order them in smaller sizes (otherwise contact one of their
distributors). A "sheet" this size costs (Year 2000 price) approx. USD300.
as far as i remember.

Depending of the application :

One thing that you have to keep in mind with this type of Perspex is that
the surface is very blank/shiny/reflective, meaning that you must place the
receiver/transmitter as close as possible to the perspex, otherwise the
receiver will repsond to the reflection from the perspex and not to the
signal that is emitted through the perspex.

To avoid this problem you can sand the inner surface of the perspex slightly
- that is what i do when i use IR-photobeam reflective sensors.

Anyway, ask for a sample before you order, since not all Perspex types are
transparent to IR.


Rgds
Jan

> -----Original Message-----
> From: Tal Bejerano - AMC [mailto:kooter@ZAHAV.NET.IL]
> Sent: 11. May 2002 12:10
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: Source for IR-transparent plastic?
>
>
> I use all the case from blue plastic (we call it "Perspex")
> it transfer IR
> very good and u cant see the IR receiver at all.
>
>
> Regards
>
> Tal Bejerano
> AMC - ISRAEL
>
>
> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On
> Behalf Of Rick Mann
> Sent: Friday, May 10, 2002 9:14 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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