Optical Where to get some VIS block, NIR pass plastic sheets?

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SUMMARY

This discussion focuses on sourcing thin plastic sheets that block visible light while allowing near-infrared (NIR) transmission for DIY projects. The user seeks materials thinner than 2mm, specifically around 1mm or less, and prefers sheets over films due to durability concerns. Recommendations include contacting ePlastics for potential thinner options or exploring alternative suppliers. The conversation also suggests using standard plexiglass with an adhesive NIR pass filter as a workaround.

PREREQUISITES
  • Understanding of NIR pass filters and their applications
  • Familiarity with plastic materials and their optical properties
  • Knowledge of DIY electronics and components
  • Experience with sourcing materials from suppliers
NEXT STEPS
  • Research thin plastic sheets specifically designed for NIR transmission
  • Explore options for adhesive NIR pass films and their specifications
  • Investigate alternative suppliers for optical-grade plastics
  • Learn about testing methods for IR transparency using basic electronic components
USEFUL FOR

This discussion is beneficial for DIY enthusiasts, electronics hobbyists, and anyone involved in projects requiring specific optical materials, particularly those focused on NIR applications.

nwytg
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I'm talking about nealy black plstic in front of some remote controls to add to my similar DIY device.

https://i.imgur.com/lmL4XN5.png

I found some plexiglass that does this (blocks visible light, let's NIR pass) but the thinnest is 2mm so I don't think it is usable for this because is pointlessly thick. https://www.eplastics.com/plexiglass/acrylic-sheets/ir-transmitting/custitem19/Black

Personally don't care what plastic it will be just need something thin (1mm or less, up to 0.2mm thin) and not strongly red tinted and also not a film but sheet as the former is very prone to scratching and bends too much. What am I looking for and where can I buy some?

I prefer to buy sheets from plastic suppliers because the optical component sellers such as Edmund or Thorlabs charge a lot for simple stuff like this. It makes sense to pay extra for quality for other stuff such as lenses or similar optical components but not this in my oinion.

So any ideas what kind of plastic sheet am I looking for and where to get some?
 
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nwytg said:
I found some plexiglass that does this (blocks visible light, let's NIR pass) but the thinnest is 2mm so I don't think it is usable for this because is pointlessly thick. https://www.eplastics.com/plexiglass/acrylic-sheets/ir-transmitting/custitem19/Black
You might try calling eplastics' Customer Service to ask if they have thinner stock, or know of another supplier who has it if they don't offer it.
 
berkeman said:
You might try calling eplastics' Customer Service to ask if they have thinner stock, or know of another supplier who has it if they don't offer it.
Already checked, they can't help with either.
 
Hmm, could you use standard plexiglass of the thickness you want, and apply a thin filter film to the inside? Do you need scratch resistance on both sides?
 
I don't, but do let me know if you managed to find a seller of adhesive ir pass films
 
If you have some shop around where you can check the sheets/samples manually then it's just a CR2032, an IR led and a smartphone to check the IR transparency.
 
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