Poly-Foam is a self-expanding, single-component, polyurethane foam that cures with ambient moisture to form a durable, semi-rigid structure. It is formulated for convenient manual application using the spray nozzle included with each canister. The foam expands to fill gaps and cavities, providing excellent insulation and sealing performance to most construction materials. Poly-Foam does not contain any propellant gases that are harmful to the ozone layer and is free to use for interior and exterior applications.