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I need an IR transmitting plastic material (85% or better) that is white in color, but partially opaque to visible light. Does anyone know of such a substance?

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  • $\begingroup$ Similar question: What plastic-like materials allow IR to pass through them? $\endgroup$ – Thomas Fritsch Jul 27 at 15:38
  • $\begingroup$ refractiveindex.info $\endgroup$ – user47014 Jul 27 at 15:39
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    $\begingroup$ Do you have an idea of the wavelength ranges you want more precisely? $\endgroup$ – user47014 Jul 27 at 15:40
  • $\begingroup$ I have no expert knowledge of plastics or optics, but what do you mean by "transmit?" I.e., do you need a camera to be able to see through it? or would it be enough for a photo transistor to be able to sense the presence of light on the other side of it? I'm skeptical about you finding a material that is clear at near IR wavelengths, but which also diffusely reflects a broad band of visible light (i.e., "looks white"). Maybe some high-tech something with nanoparticles... $\endgroup$ – Solomon Slow Jul 27 at 17:04
  • $\begingroup$ @SolomonSlow, if "IR" means 850 nm probably not. If it means 10 um, I imagine you can add some scattering features at a small enough size not to affect the IR much, but to scatter visible light nicely. $\endgroup$ – The Photon Jul 27 at 17:08

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