Cascell® RS is specially developed for use as a structural core in connection with vacuum infusion processes, such as VARI and RTM. It is applied in components of aviation, aerospace, sports equipment with resin injection process to reduce the weight. Its mechanical and thermomechanical properties are similar to those of Cascell® WH. Its cell size, which is smaller, achieves an optimal compromise between low resin absorption-about 30% less than for Cascell® WH-and satisfactory bonding of the facings to the core.