PFA and PTFE Vials are the most chemically resistant plastic vials available. Our PFA vials with threaded closures designed primarily for storage of samples. Available with flat, conical and rounded inner style configurations. Some vials are molded with solid outside bottoms for use on hot plates. All Jensen Inert molded PFA vials are manufactured from ultra-pure PFA by Savillex Corporation. (Teflon® is a registered Trademark of DuPont and not associated with this manufacturer.)