Hercules® plumbers Firestop Sealant is latex-based and intended formulti-purpose use. This intumescent sealant provides up to a three hour firerating and is designed for a wide array of firestop applications in smallcommercial or grouped residential construction or other structures withsimilar characteristics. Can be used in systems where dynamic movement isexpected: plumbing; HVAC; bath and dryer vents; metallic pipes; non-metallicpipes, conduits and tubing; insulated pipes; electrical and electronic cabling;concrete, gypsum, metal ductwork; wood floors.Expands up to 10 times to block flame propagation. Excellent smoke seal.Water-based for easy cleanup. Water-resistant once cured; will not separateor shrink when dry. Tested for excellent acoustical performance; reducesnoise transmission. Flexible, non-sagging, and low odor. Paintable. LowVOCs. No solvents. Non-halogenated. Does not contain PCBs or asbestos. Behold the power of Hercules®, products built to last and trusted by plumbers to withstand even the toughest conditions.