PTFE is modified with a filler material to create these impact-resistant rods. They have a super-slippery surface that resist wear, as well as excellent resistance to chemicals and extreme temperatures. These easy-to-machine rods are nonabsorbent, so they won’t swell when exposed to water. They’re also good electrical insulators.

Grade J is the most slippery of the Rulon materials and is often used to make gaskets and wear strips.