FKM-Lined Silicone Hose — Engineered for Hydrogen Transmission Material & Structural Engineering Inner Liner: FKM (Fluoroelastomer) »Provides exceptional resistance to hydrogen, fuels, oils, solvents, and gases. »Offers very low permeation rates compared to unlined silicone, significantly reducing hydrogen loss through the hose wall. »FKM’s stable chemical structure contributes to extremely low chemical leaching and outgassing, supporting system purity and safety. …