Vespel
Vespel is a registered trademark of the DuPont de Nemours company , which uses them for plastics that are designed for extreme thermal , electrical and mechanical loads . The material referred to in the following as Vespel is the polyimide that was first sold under this name.
The material can be used in a temperature range between absolute zero and, for a short time, well over 400 ° C. Vespel has no melting point and no detectable glass transition temperature .
Vespel is radiation-resistant and low in outgassing, so that it can also be used in a radioactive environment and in a high vacuum . The thermal and electrical conductivity are very low. For a plastic , Vespel has a relatively low coefficient of thermal expansion and good dimensional stability and therefore enables components to be manufactured with tight tolerances . The parts are wear-resistant and can also be used in an unlubricated environment.
By adding graphite or polytetrafluoroethylene , for example , the properties of Vespel can be changed in a targeted manner.