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Originally Posted by datune

Isover (Isover, leader in thermal and acoustic insulation) told me that density does not affect absorption at all, is that true?

No. The effect is gradual over the densities used for acoustic purposes and depending on the thickness the density is quite important. If you want the skinny on this, and how density is NOT the important factor, read this:

GAs Flow Resisitivity thread.

Full of gas,
Andre