It is based on moisture curing polyurethane, containing safety propellant, is used to seal gaps and crevices with very high expansion yield UP TO 65 LITERS, the post-expansion is quite low to prevent deformation. The foam that dispenses from aerosol can is moisture cured and draws humidity from the air for pipes, windows and doorframes. Foam can be cut once fully cured, provides excellent bond to lumber, plywood, concrete, metals, masonry and other substrates.