.032″ thick AFM (Aluminum Foamet Material). OEM replacement reference 25700370. AFM gaskets are made with an aluminum core with a chemically blown; compounded nitrile synthetic thin foam-like rubber layer bonded to both sides. Temperature resistance of over 250øF (122øC). AFM rubber has a 85% recovery while maintaining strong torque retention. Re-torqueing; gasket sealers or silicone beads are not required.