With cellular rubber we mean closed cellular foams made of a rubber type. Cell rubber are available in different hardnesses or densities. The densities are between 70 and 200 kg / m3. The hardnesses range is from ShoreOO 28 till 60. The types of rubber that are available in cellular rubber at HTR are: EPDM, neoprene, NBR, silicones. Cellular rubber is molded into blocks and then slit into the right thickness and connected to create rolls. As a result, there are glue connections every few meters in a roll. The sealing quality on these connections is less compared to the rest of the cell rubber. If desired these connections can be detected and taken out.