3M Expantrol Flexible Intumescent Strip E-FIS, Adhesive-Backed, Black, 1/16 in x 1/2 in x 50 ft, 10 rolls/case

Fire resistance in a tape strip format, ideal for door frames and glazing, Intumescent material expands when heated to seal around objects exposed to fire, Smoke seal retards spread of toxic by-products of combustion, Excellent flexibility for easy and cost-effective installation without special tools, Versatile and conformable – can be cut to fit irregular shapes