These sheets are manufactured from Rulon PTFE, a PTFE that’s been modified with a filler material. In addition to having the superior chemical and temperature resistance of PTFE, they have excellent impact resistance and a super-slippery surface that resists wear. These easy-to-machine sheets 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.