Fire rated one component, expanding polyurethane foam filler. Rapid curing. Excellent thermal and acoustic insulation properties. Excellent primer-less adhesion on most construction materials. Conforms to EN1366-4 – Fire resistance, up to 4 hours depending on joint configuration. For use in passive fire protection systems as a large gap filler; installation of fire retardant window and door frames; sealing of expansion and connection joints, penetration seals.