Mineral Fibers. Use mineral fibers made from virgin basalt, diabase, slag, or other silicate rock.Use an approved mineral fiber meeting the following requirements for shot content, as tested according to ASTM C 612. Sieve Percent Passing 250 µm (No. 60) 85 - 95 63 µm (No. 230) 60 - 80
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Samples: contracts.patreasury.gov, contracts.patreasury.gov, Ecms Highway Construction