Highpower Multi-Purpose Expandable PU Foam Insulation SealantType: Polyurethane (PU) expanding foam aerosol sealant.Application: Ideal for thermal insulation, soundproofing, and sealing gaps around door and window frames, pipes, and wall cavities.Handling: Typically used upside down with the included plastic extension straw for precise application, requiring upright storage when not in use.