FM011 Moldable Firestop Putty is an industry leading, one-part, flexible intumescent putty ready-to-use for wall or floor openings containing cable trays, cable bundles, plastic pipes and/or conduits providing up to a 3-hour fire resistance rating. Formulated dark red, this easily moldable putty stick provides up to 4 hours of fire protection. These. Shipping fee and delivery date to be negotiated. Long-lasting protection for construction and maintenance projects. Whether you need to firestop outlet boxes or small cable penetrations, you will find the solution here – our quick to install putty pads, putty sticks and cable discsNS Fire® Putty is a solvent free putty for fire barriers up to 4 hours.