Pur Black NF is Pur Black Gun Foam in a convenient can with a nozzle. Pur Black NF is a straw dispensed foam that expands, bonds and seals to stop the passage of air, gases, water, dust, fibers, sound, rodents, pests, radon and odors.
Pur Black NF is a closed cell foam. Closed cell foams have gas pockets sealed from each other. An example of a closed-cell foam is a camping mat; the mat cannot soak up water. This single use canister can be used for the smaller jobs and does not need a foam gun.