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No solid material is entirely soundproof, though some insulate better than others. Not sure what your application is, but you might try some of the products musicians use to soundproof (partially soundproof, natch!) studios.
To paraphrase what God said to King Arthur, "What is your purpose?" What kind room are you dealing with? Home theater or something else? I know a fair piece about musical studio matters, not much about home theater (the producing side of music and video interest me more than the consuming side. =^_^=)
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