POLYURETHANE FILLING FOAM FOR DOORS AND WINDOWS RAPID POLYURETHANE FILLING FOAM WITH AXTON STRAIN 750MLIt is ideal for insulating and sealing doors and windows since its controlled expansion does not deform the substrateCan be used with most building materials: concrete, wood, cement, PVC… except PE (polyethylene), PP (polypropylene), PTFE (polytetrafluoroethylene).