NuFlex® 136 Draft Stop is a one-component, non-combustible caulk. It meets ASTM E-136 requirements designed to resist high-temperatures and smoke in non-rated construction. NuFlex® 136 is to be used in annular spaces
around wires, pipes, ducts, and vents in wood or steel framed non-rated construction.
NuFlex® 136 Draft Stop dries to form a fire and heat resistant shield around the penetrating items. NuFlex® 136 is light red in color for ease of inspection and is available in 300ml (10.1 fluid ounce cartridge).