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Zhejiang Aijiren, Inc.
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  5. Aijiren - Screw Caps with Septa for ...

Aijiren - Screw Caps with Septa for 8-425 Screw Neck Vial

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Caps for screw thread vials are available with either an open hole for autosampler use and standard addition or with a solid top for sample storage. One piece polypropylene cap and membrane are also available. These pierceable screw thread caps are designed for one time use and reduce sample preparation time as there is no cap and seal to assemble. Screw Cap Vials are universal. Screwing the cap applies a mechanical force that squeezes the septum between the glass rim and the cap. Screw caps form an excellent seal and mechanically hold the septum in place during piercing. No tools are required for assembly.  The Screw Caps that are inlcuded with this kit are knurled on the sides for excellent gripping and comfort when applyting to the vial.

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  • Suitable for: 8-425 Screw Vials
  • Caps Material: polypropylene
  • Septa Material: PTFE / Silicone
  • Septa Size: 8*1.5mm
  • Cap Features: 5.5mm Centre Hole or Closed Top
  • Color: Black, White or Customized

Septa

PTFE/Silicone Septa:

High quality, pure silicone is laminated to PTFE to give a pure, highly inert septum with excellent resealing characteristics even after repeated punctures.

PTFE/Silicone septa are the preferred product for use in most HPLC and GC applications where resealability and high purity are critical. Works well for applications where ease of needle penetration is important.

Septa-silica gel has strong repetitive sealability, and it can maintain good close performance after multiple injections; PTFE is a material with better chemical conditions at present, and it can withstand strong acids and alkalis. The two materials After compounding, the bottle can be used for various laboratory purposes such as sealed sampling, chemical storage and so on. 

PTFE/Silicone/PTFE Septa:

A layer of PTFE is laminated to each side of high purity, medium durometer silicone to form a septum that is the most resistant to coring while maintaining good resealing characteristics. The PTFE/Silicone/PTFE septum is recommended for the most critical applications such as ultra trace analysis or where there is a longer time between injections or for internal standard methods. PTFE/Silicone/PTFE septa provide superior performance with any autosampler employing a large diameter, blunt tip needle.

  • The silicone / PTFE septa used were designed to provide the right amount of resistance to autosampler needles during the injection process so that they penetrate the vial properly without damaging the septa or the injection needle.
  • Too much or too little resistance to the needles can damage the septa, compromise resealing, cause needle blockage from coring of the septa material and even damage your autosampler.
  • These septa perform even when using a wide range of needles: fine, blunt or even dull.
  • Low sample or solvent evaporation performance even after multiple injections have been observed when using aijiren caps.