Pressed wool felt is identified by the S.A.E. standards F-1 through F-55. Custom Gasket's variety of S.A.E. felt parts are manufactured to the required engineering specification. Lower number S.A.E. felts (F-1, F-2, etc) are more machine-able, better in vibration absorbing and have better abrasion resistance. S.A.E. wool felt is unaffected by sunlight and maintains its original form after prolonged periods of stress. All of our S.A.E. felts are ROHS compliant and can be certified to automotive specification FMS-302 (fire resistant). F-1 thru F-55 felt is available in various thicknesses, wool content, and densities. Wool or a blend of wool and synthetic fibers are mixed, carded and then steamed and felted.