Perlite Use: Insulative, Acoustical, and Fire-Proofing …
Perlite has been used for this purpose for decades and ASTM testing specifications, test results, and thermal design tables are readily available. As for perlite's acoustical properties, lightweight 8 in. (20 cm) masonry block filled with expanded perlite achieves an STC of 51, which exceeds HUD sound transmission standards. ...
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