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I am very new to this site and this is my first ever question. I want to know what is this black material in this sensor film kit. I am creating a weight sensor by using this very sensor kit. Now I am short of this black film. I want to purchase it now locally but do not know the composition of this material. This material behaves as a resistance between two aluminium foil, just to inform. If any one can help me in this.

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    $\begingroup$ This really should be on the electrical engineering section. // I don't know what specific material this is, but Google "Conductive foam" and you should find some. The resistance changes as the foam is squeezed. $\endgroup$ – MaxW Nov 19 '15 at 5:33
  • $\begingroup$ @Max In this case I agree that it would probably better fit another site. But I am only one. Before asking to migrate something it would be preferable if the question is closed by the community. Then I will research if it is a good fit for the target site. Still, thank you for your effort. $\endgroup$ – Martin - マーチン Nov 20 '15 at 3:31
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It's called a force sensing resistor. It's basically a film of small conductive particles mixed into a non-conductive polymer matrix on top of a conductive substrate. The more force on the film, the more conductive particles can touch the layer underneath, reducing the resistance. Sensitronics owns the original patent for the technology and their site shows how they're constructed, though you'll probably have to dig up the patent to find out exactly what's in the force sensing layer.

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