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rock wool |
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On page 1454, Table 5 (under "Respirable dusts and fibers"), glass wool, rock wool, and slag wool fireproofing should not have appeared in the listing of Group 2B human carcinogens because they were downgraded to Group 3 in the latest monograph to address these substances (IARC 2002a); special purpose glass fibers such as E-glass and "475" glass fibers are not used in the "Reinforced plastic industry" but rather in "High-efficiency air filtration media and battery separator media" (IARC 2002a). Fibrous materials and rock wool products tend to hold wetness longer than rigid Foamglass[R] or other, less porous, insulation materials; however, all materials absorb and hold some moisture. The water stored in the bottom of the pot is pumped directly into the rock wool using a small pump. |
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