Soudafoam Gap Filler Xtra is a one-component, self-expanding, ready to use polyurethane foam with acombination of aspecial for mulation and the SoudalMega Adapter to increase the yield of cured foam withalmost no expansion after extrusion. Soudafoam GapFiller Xtra is filled with HCFC and CFC-free propellantswhich are not harmful for the ozone layer