Soudal Genius Flexifoam Blue 750ml 175598Flexible Insulation Expanding Foam Gun Grade is a one component, self expanding, ready to use polyurethane foam with elastic properties, which allow the foam to follow the movement of the joint and keep its insulation properties for many years. Because of the Duravalve, the optimal yield remains over the entire shelf life, even when stored or transported lying down. Flexible Insulation Expanding Foam Gun is filled with HCFC and CFC free propellants