Black material on Bottom Cover Kit

Does anyone know what the black material surrounding the vents is? Looking to get some so to reduce heat transfer from the mainboard to the bottom cover.
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Since there are unused fan fins behind it, it could also just be there to prevent air/dust from getting into the chassis

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Definitely that but I think there may be a thermal effect as well. Some of Dell’s laptops use a material called Gore (which is really just some type of aerogel insulation if I recall correctly) to minimize heat transfer from the CPU to the bottom panel.