Low-pressure polyurethane foam intended for assembly and sealing for specialized assembly groups. The foam has exceptionally good adhesion to all smooth and porous surfaces occurring when installing doors and windows: PVC, glass, surfaces covered with paint, masonry, concrete, brick, wood, metal and others. The low-pressure formula eliminates frame warping and ensures full gap filling. Especially recommended for embedding all types of windows and doors, thermal insulation of water, sewage and central heating networks, gluing and insulating wall panels, corrugated sheets, roofs, etc., soundproofing and sealing of partition walls and car cabins, joining prefabricated elements in wooden skeletal structures, thermal insulation of roofs and roofs, filling gaps in thermal insulation when insulating buildings.