PTFE (also known as Polymer) has the lowest co-efficient of friction of any solid material and is greatly effective operating at extreme temperatures. This rod also has a fantastic chemical resistance and excellent electrical insulation properties. However, PTFE rod can be difficult to bond, but it is non-melting and is also self-extinguishing. Our manufacturers make engineering plastics that are somewhat oversized in either diameter and/or thickness. This is provided to assist customers to produce very accurate items within the size shown and remove any minor surface imperfection. Dimensions:custom.