Firestop Bricks are intumescent bricks designed for firestopping openings with multiple penetrants. The firestopping material is sealed in a heat-sealed polybag for ease of installation and strong, durable product. Bricks can be stacked and can be easily retrofitted for difficult applications. No special tools required for installation. UL classified and FM approved. Size: 4″ x 9″ brick.
Expands up to 10x. Excellent for use as a smoke seal and acoustically tested to reduce noise transmission. Contains no solvents that might adversely affect plastic pipes or cable jackets.