Altmann Analytik ND11 Crimp Seals: Aluminum Cap blue lacquered + centre hole, RedRubber/PTFE beige, 1000/pac

RedRubber/PTFE Seals 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. RedRubber is a synthetic rubber.