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488 is a 2 mil, alloy aluminum foil backing used with fiberglass duct-board to provide a dependable vapor barrier to the insulating system. It conforms to irregular surfaces such as FSK facings & blends with the basic facing pattern to provide a vapor barrier that assures integrity of the insulation system./nVisit: http://www.idccorp.com/index~ID~,Mechanical.Insulation,Tape,Foil.Tape~path~find~ds~dept~a~1
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