Cellular rubber is a flexible material with closed cells. So the material is water- and air-proof without an outer layer. Strips and rings seal up without any problems in contrast to sponge rubbers. Water cannot enter the closed-cell structure.Because of its flexibility and elasticity cellular rubber can be used as gasket material at low closing forces and different gap width. Furthermore this material is used for the acoustic insulation, shock absorbance, padding and many more. Greater measure tolerances should be considered for cellular rubber parts because of certain shrinkage ratios.