Mainly technical moulding forms the basis of the used material, and it has a different quality according to the specific requirements of customers and the demands of the environment, where the products work. A wide scale of commonly accessible rubber stock, for example: EPDM, NBR etc. are used, but as well polyutherane, which is qualitatively on an upper level.
Technical rubber
Technical rubber is a traditional material based on natural or synthetic rubber. It is irreplaceable in many industries due to its properties and especially its favorable price. A wide range of rubber compounds is used, e.g. NR, EPDM, NBR, SBR, CR, PU, etc., which with their properties cover a wide range of products. The most commonly used mixtures of rubber and polyurethane are resistant to temperatures, oils and mechanical and dynamic stress. Some mixtures withstand long-term temperatures from -57°C to +150°C, the tensile strength is up to 21 MPa. Available hardness is from 35 ShA to 95 ShA.
Cast polyurethane
Cast polyurethane is one of the newest materials in the rubber industry. Its advantages include flexibility, excellent wear resistance, chemical resistance, stability in water and relatively low costs due to its long service life, which is 2 to 3 times higher than that of technical rubber. These properties predetermine it for use on the most stressed products. Molds for cast polyurethanes are relatively cheap and can be made of different materials, which also allows piece production. Long-term resistance to temperatures from -40°C to +110°C, tensile strength is up to 41 MPa. The hardness used is from 55 ShA to 55 ShD, at the customer’s request it is possible to supply material with a hardness from 0 ShA to 85 ShD.
Silicone
Silicone is mainly used in cases where high heat resistance or great flexibility at low temperatures is required, it is also suitable for contact with food. Silicone has a relatively low strength, which, however, hardly changes over a wide range of temperatures. Long-term resistance to temperatures from -60°C to +205°C. Available hardness is from 10 ShA to 90 ShA.