FDA and USP Class VI FFKM grades enable life-science use. Kalrez 6221 and 6230 (white), Chemraz 514, and Tecnoflon PFR 945 are certified for pharmaceutical seals, sterilizable by gamma, EtO, and autoclave 1,000+ cycles without degradation. Used in isolators, filling lines, and single-use systems https://globalsealstech.com/ffkm-seals/