Rectorseal 66320 Metacaulk Composite SheetRectorseal 66320 Metacaulk Composite Sheet is hard fire resistive panel for sealing penetrations restoring fire rating to floors ceilings walls with penetrating openings. Intumescent material bonded to steel sheet that chars slows heat transfer when exposed to fire. Features Intumesces (expands with heat) to form a refractory char that tightly seals penetrations against flame spread, smoke and toxic fumes. UL Classified. Provides up to a 3 hour fire
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