UltraSeal® PF-100 Tank Foam is a one component low expansion foam that is UL classified. It is the ideal product to seal, fill, & insulate around joints, beneath base plates, mid sills, top plate penetrations, corner joints, T-joints, exterior cracks, around utility panels, pipes and duct penetrations. It is specifically designed to be dispensed as a bead for filling cracks, crevices, and to fill smaller cavities on flat or irregular surfaces.