Septa and Specialized Hand Tools

A GC septum is located at the top of the injection port and serves two functions: 1) providing a leak-free seal to maintain carrier gas pressure inside the system, and 2) handling repeated puncturing by a syringe needle for sample introduction purposes without severe coring or leaking.

We offer a variety of septa to serve many functions. Choose:
  • Molded Thermogreen LB-2 septa for most applications. These bleed-temperature-puncturability-optimized septa (up to 350 °C injection port temperatures) are widely considered the best septa choice.
  • Thermogreen LB-2 septa when the diameter required is not offered in the Molded Thermogreen LB-2 septa line.
  • Thermogreen LB-1 septa for lower temperature applications.
  • SS-174 PTFE-Faced septa when the inertness of PTFE is required.
  • GR-2 septa as an economical option for lower temperature applications (up to200 °C injection port temperatures).
  • Merlin Miscroseal systems for a septum-less system. While more expensive, these long-lasting systems will pay for themselves many times over.

Routine Maintenance: To reduce the risk of leaks and contamination, injection port septa should routinely be replaced. Change the septum daily, especially if the instrument is in heavy use. Repeated use of the same septum may result in increased coring, resulting in a leak. Septum fragments in the inlet liner can also lead to ghost peaks and/or loss of response due to adsorption of analytes as they pass through.

Storage and Handling: Septa can become contaminated by volatile compounds in the room air, or by finger oils. To ensure cleanliness, it is recommended that septa be stored in their shipping container with the lid securely closed, and that clean forceps be used for handling the septa during installation.

In addition to septa, we offer several specialized hand-tools for removing septum from injection ports.