Thermoplastics are polymer materials that are essentially harder and rigid at their application temperature compared to elastomers. Depending on their chemical structure, their properties vary from hard and stiff to flexible. Extensive stretching is non-reversible and molded parts remain in the deformed shape. Therefore, they are also called Plastomers. Thermoplastics are used in the sealing technology mainly as backup rings and guiding elements, bearings, and bushes.