3M Fire Barrier Moldable Put

3M(TM) Fire Barrier Moldable Putty Pads MPP+ 9.5 in x 9.5 in (303) A 3/32" thick 9.5" x 9.5" pad synthetic elastomer designed for use as a one part, intumescent fire resistive putty used to restore the integrity of fire rated building construction. An ideal solution for putty on the outside of an electrical outlet box to receive a fire rating. Excellent adhesion.