AI: 0.005% Fipronil. Termidor FOAM contains Fipronil, the same active ingredient as Termidor SC, in a RTU (ready-to-use) foam that is labeled for termites and ants. Perfect for spot treatments, Termidor FOAM expands rapidly creating a dry foam that can be applied in the voids, harborages, galleries, and nests where insects are found. Termidor FOAM can be applied in and around residential and commercial structures; structural and non-structural elements that are prone to insect attack (such as fences, utility poles, landscape timbers, bridges, or under slabs); or insect harborages. This product can be applied from the interior and/or the exterior according to label directions. To access some harborages the drilling of holes may be required.