Polyurethane sponges are used as pressure-resistant gaskets instead of gaskets which are exposed to friction in cutting molds in the printing sector, instead of gaskets operating in oily media, instead of sponge gaskets suitable for food and as gaskets in various places resistant to flammable materials such as solvent and thinner. 250x500mm, 2mm to 65mm in dimensions. (kg / m3) at the density of 0.35 to 0.65.