FlexFoam-iT! Series Castable Flexible Urethane Foam FlexFoam-iT! 7FR certifies to FMVSS 302 Flame Spec.FlexFoam-iT! III, 4, V, 6, 7FR, VIII X, 14, 17 & 25 water blown flexible polyurethane foams are available in 3, 5, 7, 8, 10, 14, 17 and 25 pound densities.They are two-component castable flexible foams that are strong, versatile and easy to use.A + B mixture expands many times its original volume.Vibrant colours can be achieved by adding colour pigments.Ideal for arts, crafts, industrial and specials effects applications including padding/cushion material and gasket material.