Cap including septum, consisting of silver lacqueered alumium-cap, 11 mm crimp top, with 5.5 mm center hole; septum red / beige Rubber / PTFE, 45° shore A, 1 mm thickness

Temperature resistant from –40°C up to 110°C; softer alternative to Natural Rubber/TEF and Butyl/PTFE; Cleaner than Natural Rubber or Butyl;

low fragmentation; Synthetic rubber