Aggregate, Lightweight.

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Aggregate of low specific gravity, such as expanded or sintered clay, shale, slate, diatomaceous shale, perlite, vermiculite, or slag; natural pumice, scoria, volcanic cinders, tuff, and diatomite, sintered fly ash, or industrial cinders; used to produce lightweight concrete; aggregate with a dry, loose weight of 70 pounds per cubic foot or less.

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