Caps, Headspace, Crimp Top, with Grey Butyl Rubber / Transparent PTFE Septa, fitted in Steel, Magnetic, Gold Caps with 8mm center holes. For use with 20mm Crimp Top Headspace Vials. BASIK Brand. 1000/CS.
Butyl Rubber Septa that is laminated with PTFE and is 55⁰ Shore A (hardness) and is 3.0mm thick.
Temperature resistant from -40C to 120C.