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Old 03-23-2012
Flybyknight Flybyknight is offline
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Re: Acoustic Insulation for engine room?

Did a study on this subject several years ago, and what I found was the most effective sound deadening composite is lead foil sandwiched between 1 inch (or more) of foam and secured with a pressure sensitive adhesive.
Yes, psa's have sound deadening qualities too.
Hope this helps.

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