Know for being very good type slip tolerant mechanical plastics is Dupont Cast Natural Nylon type 66 materials. This grade of plastic has been available for decades.

Black Extruded Nylon type 6/6

Dupont Nylon is a super tough and durable mechanical plastic. Known for abrasion resistance is a common material for critical needs like machining critical wear parts for machines.  If you are looking for a wear resistant material simply click here, %LINK%
This exceptional material excels with extended use and are typical for Nylon. Nylon comes in a wide range of sizes and shapes, including thin sheet to massive blocks. The Natural Extruded Natural Nylon type 66 materials are commonly available.

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

Nylon 66 rod