Hercules plumbers firestop sealant is latex based and intended for multi-purpose use. This intumescent sealant provides up to a three hour fire rating and is designed for a wide array of firestop applications in small commercial or grouped residential construction or other structures with similar characteristics. Can be used in systems where dynamic movement is expected: plumbing; HVAC; bath and dryer vents; metallic pipes; non-metallic pipes, 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 separate or shrink when dry. Tested for excellent acoustical performance; reduces noise transmission. Flexible, non-sagging, and low odor. Paintable. Low VOCs. No solvents. Non-halogenated. Does not contain PCBs or asbestos.