FlexFoam-iT!™ flexible foams are available in 3, 4, 5, 6, 7, 8, 10, 17, 23 and 25 pound densities. They are the strongest flexible casting foams available anywhere. Vibrant colors can be achieved by adding color pigments and Cast Magic™ powders can add an endless variety of bright metallic, glitter & color effects. Ideal for making props, industrial and special effect applications, padding/cushion material and gasket material. FlexFoam-iT!™ 7FR certifies to FMVSS 302 Flame Spec. FlexFoam-iT!™ 23 FR certifies to UL-94 HB Flame Spec.