Aluminum Crimp Seals ND8

Aluminium Cap clear lacquered, 4 mm centre hole.

Natural Rubber/TEF and RedRubber/PTFE Seals

• Temperature resistant from - 40 °C up to 120 °C for Natural Rubber resp. up to 160 °C for RedRubber
• Natural Rubber harder to penetrate with more fragmentation during penetration than RedRubber
• Natural Rubber ideal for multiple injections due to high resealability, but not as clean as the synthetic RedRubber

Silicone/PTFE Seals

• Temperature resistant from - 60 °C to 200 °C
• Preferably only for single injections
• Different hardnesses to meet the respective needle types
• Silicone septa coated on both sides for low particle formation during penetration
• Cleaner than Natural Rubber or as RedRubber

Other Crimp Seals

• PTFE is very inert and temperature resistant, however, problems with leakage due to the inflexibility and thinness of the material
• Only for single injections for non-critical HPLC analysis
• Viton is resistant to a variety of corrosive organic substances; temperature resistant from - 40 °C to 240 °C, main application in the petrochemical industry