Infrared transmission of common polymers?
Infrared transmission of common polymers?
(OP)
I am having major trouble finding IR transmission data for polymers commonly used in injection mouldings.
We require an ABS or Polycarbonate matl which not only blocks visible light (~400-700nm) but also effectively blocks all transmission from 700nm>1300nm too.
Are there any resources available for optical transmission characteristics of polymers available on the web or on paper?
thanks for any help on this.
JB
We require an ABS or Polycarbonate matl which not only blocks visible light (~400-700nm) but also effectively blocks all transmission from 700nm>1300nm too.
Are there any resources available for optical transmission characteristics of polymers available on the web or on paper?
thanks for any help on this.
JB





RE: Infrared transmission of common polymers?
Chris DeArmitt PhD FRSC CChem
www.phantomplastics.com
Consultant to the plastics industry
RE: Infrared transmission of common polymers?
We can indeed use black polymers for some parts, but some visible parts will have to be white.
Regards,
JB
RE: Infrared transmission of common polymers?
Carbon black is pretty black. Kinda like soot or coal.
If you need white it might have been good to say so.
Titanium dioxide gives some protection from UV light and is white in colour. You need to contact suppliers for info on suitable grades and level of transmission or otherwise.
Regards
Pat
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RE: Infrared transmission of common polymers?
Chris DeArmitt PhD FRSC CChem
www.phantomplastics.com
Consultant to the plastics industry
RE: Infrared transmission of common polymers?
Does your contact have these pigments produced specifically for his own requirements or are they commercially available so I can get our moulders to use them?
Your help is much appreciated; The big manufacturers have been of little help so far.
thanks.
JB
RE: Infrared transmission of common polymers?
http://download-book.net/tio2-DuPont-ppt-pdf.html
RE: Infrared transmission of common polymers?
Chris DeArmitt PhD FRSC CChem
www.phantomplastics.com
Consultant to the plastics industry
RE: Infrared transmission of common polymers?
I've been down that road many times. Even the blackest of black parts can be transparent to IR. White; forget it.
Worse, if you find a compound that works with this year's lot of interrupters, next year's sources will be stronger and the sensors will be more sensitive, and you'll be back in the same boat.
Been down that road also.
One pigment that I've found that works consistently for this purpose is brass, in sheet form. It can be mechanically or adhesively retained. Aluminum or steel could also work, but none of them will be effective in powder form in thin sections; you need sheet or foil.
Mike Halloran
Pembroke Pines, FL, USA
RE: Infrared transmission of common polymers?
For some reason I was thinking UV not IR.
Ciba makes (or made) a range of IR absorbers. I don't know if they cover the full range you require nor if they will make the moulding an unacceptable colour, but they did make IR absorbers.
Regards
Pat
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RE: Infrared transmission of common polymers?
We do have samples of a white polymer from a competitor's product which blocks all VIS and >95% of the IR. We've just got to match it!
Thaks again for all of the help and advice.
JB
RE: Infrared transmission of common polymers?
Chris DeArmitt PhD FRSC CChem
www.phantomplastics.com
Consultant to the plastics industry
RE: Infrared transmission of common polymers?
JB