Filler Materials: Non-Asbestos, PTFE, Grafoil , Ceramic Windings Strips: 304, 316 Stainless Steel,Hastalloy, Alloy 20, Monel, Nickel, Inconel, Incoloy, Duplex SS, Zirconium,Tantalum, Copper, Phis-Bronze, Carbon Steel Guide Ring Materials: Carbon Steel,most stainless grades, Inconel, Monel, Titanium, Nickel, Alloy 20, and Hastalloy.