Abesco Fire Stop FP 200 Fire Rated Expanding Foam - 24oz Can - 1 Piece

Used this in a warehouse building where the concrete block hits the steel roof deck in order to seal an air gap between two rental units. I researched different foams online and found that this one appeared to be the best product. I was still skeptical that it would stop fire from traveling and the foam would hold up against fire. I experimented with some of the foam. Took a propane torch to a glob of foam. With the torch on it, it burns very slowly and once the torch is taken off the foam, the flame goes out quickly. I was truly impressed and satisfied with the product. It really works. Just bought more.