The suitable screw closures are ready assembled.

• Large range of screw closures with different septum materials and cap colours
• Including a magnetic version for CTC GC PAL autosampler or identical constructions
• Bonded screw caps (septa firmly connected with the cap) have the advantage that blunt HPLC needles cannot push the septum into the vial
• Septa made from economical Red Rubber/FEP, high quality silicone/PTFE (also slitted) or silicone/polyimide and from virgin PTFE