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Yup, I'm talking about this stuff:



It's mainly used at home as a sound-absorbent material, however I've not yet found anyone using it in a car!!

This thing has an amazing acoustical absorbtion coefficient, a 25mm mat has a .25 @ 250hz coefficient, and .5 @ 1khz.

It's a very plush material, and can be easily compressed down to about 3mm thick, so it would be usable inside a car, it would help kill outside noise and reverberation. As a side effect, it also works as thermal insulation.

Which makes me wonder, if this stuff seems so great and is usable inside a vehicle, why nobody uses it? what's the catch?

The thing is I have not been able to find a local MLV supplier (I live outside the US), so I'm looking for alternatives, as crazy as they seem :)
 

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Well you have glass and wool in the same name, that should be your problem.

Most likely for the same reason fiberglass mat is not used in cars: the fibers are dangerous if inhaled.

Maybe this is the same, or similar, material.
 

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F-g mat is not very effective at lower frequencies. It would have to be a foot thick before it would do any good.
 
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