High quality ferrules made of 100% Graphite or 15% Graphite / 85% Vespel
Type A: 15% Graphite / 85% Vespel, for injectors and detectors at atmospheric pressure (e.g. FID)
Type B: 15% Graphite / 85% Vespel, for GC-MS interface connection
Type C: 100% Graphite, for injectors and detectors at atmospheric pressure (not for GC-MS)