I would guess that it's fundamentally a rubber based product so it probably has some use as a damper when it comes to vibrations. However that would make it more effective as a structural additive, absorbing vibrations but not necessarily as an acoustic damper. One absorbs physical vibrations whereas the latter slows sound waves down. The right damping material can increase compliance thereby increasing volume. They are both dampers but in different respects. Also there are other ways of using rubber such as making a foam out of it which increases its surface area making it a good acoustic damper.
Thanks - This makes good sense. Probably far too dense to dampen air motion sound waves effectively.