Page 253 - Shimadu Consumables Catalog

Appendix I

Product Description
1) Seal
A seal is an already assembled closure consisting of a cap and septum.

2) Rubber
Red Rubber/PTFE is a synthetic rubber which is softer and show less fragmentation than Natural Rubber/PTFE. It has better
cleanliness and purity then Natural Rubber/PTFE but inferior than Silicone. Nevertheless, it does not have the outstanding
resealability property like Natural Rubber for multiple injections.

3) Pre-slit septa
The septa are cross-slit to aid in the needle penetration. The Septa are only cut through the Silicone layer, but not the PTFE
layer to avoid the risk of concentration changes due to solvent loss or contamination from the environment.

4) Ultrabond
The Ultrabond seal is that the septa and screw cap form an inseparable unit. The molecular structure of the contact areas of
the PP screw cap and the septa are modified such that it requires no glue or adhesive between the two to form a firm unit.
The Ultrabond products is recommended over a general cap/septa assembly:
- To avoid pushing the septa into the vial when use with very thick and dull needles
- For screw caps with a wide diameter, where a septum cannot achieve any press-fit in the cap

5) Micro-insert
A Micro-insert is different from a Micro-vial where it cannot be sealed on its own. The diameter of the Micro-insert is
depending on the size of vial opening. A Micro-insert reduces the volume of sample needed and allow the needle to pick up
even the smallest sample quantities.