Firestop for Large Openings
Metacaulk® Composite Sheet is a rigid, fire resistive panel used to seal penetrations and restore the fire-rating to floors, ceilings or walls in which a large opening has been made for the passage of penetrating items. It is made of a reinforced, highly intumescent material which is bonded on one side to a steel sheet.
US Patent No. 6,207,085.
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