.032" AFM. (Aluminum Foamet Material). OEM replacement reference OEM replacement reference 31488-81, 31488-81A, 31488-81B, 31488-81C. Cometic's AFM gaskets have an aluminum core with a chemically blown, compounded nitrile synthetic thin foam-like rubber layer bonded to both sides. Temperature resistant to over 250°F (122°C). AFM rubber has a 85% recovery while maintaining strong torque retention. Re-torqueing, gasket sealers or silicone beads are not required.