Know for being very good grade slip tolerant mechanical plastics is Natural Natural Cast Nylon type 6 . This plastic material has been produced from Dupont resin for over 40 years.

Black Black Cast Nylon type 6/6 materials

Nylon material is well known for being wear resistant. Nylon is the preferred material for critical needs like pulleys, slide ways, chute impact points and chain guides.  If you are looking for a wear resistant material simply click here, %LINK%
Extreme applications are typical for Cast and Extruded Nylon. Nylon has one of the widest ranges of sizes and shapes, including small extrusions to massive castings. The Natural Black Cast Nylon type 66 are commonly available.

Between the Delrin and Acetal rods, both materials are exceptionally tough and easily machinable, as they have similar physical properties. They do look the same, but in practical uses there are some differences that can make one preferable than the other. It also depends on your application. As with all plastic materials, be sure to check the typical properties data sheet for the desired properties you may need for your application.