Douglas Expanding Foam Gun Grade 750ml is an easy-to-use, polyurethane-based expanding foam for general construction and home improvement applications. It's ideal for filling large, irregular, or awkward gaps where the foam will expand to completely fill the cavity. This expanding foam can also be used for fixing window and door frames and boards, insulating between brickwork and cladding, around ductwork, and through cavities carrying pipes and cables. Additionally, it can be used as a joint backing material, compatible with all types of sealants. The 750ml size makes it convenient for various tasks.