Aircraft Engine Green FKM O-Ring — High-Temperature Resistant Seal Combining high-temperature resistance with outstanding chemical resistance, fluorocarbon-based compounds come close to the ideal universal O-ring material. This FKM O-ring is engineered for demanding aerospace and industrial sealing applications where reliability under extreme conditions is essential. Trade Names FKM® — DuPont Performance Elastomers Fluorel — 3M Company Technoflon — Solvay Solexis, USA