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Injection Port Septa

In gas chromatography, a liquid sample is injected into a gaseous system, maintained under elevated pressure (e.g. 20 psi) where it undergoes analysis in accordance with well known procedures. The equipment is provided with injection ports that are sealed by an elastomeric septum. Needles are utilized to penetrate the septum and to inject the sample into the injection port. For the injection port septum to work properly, it must be able to withstand high temperatures, be resistant to coring, and generate a low amount of bleed.

Injection Port Septa Characteristics

All high performing injection port septa have the same characteristics. They are typically manufactured of silicone and molded to ensure proper fit, are conditioned for lower bleed even under high temperatures, and are designed to minimize coring (shedding of particles into the port liner). Regardless, volatile materials may be released when the septum is heated to temperature. Most chromatographs have a septum purge flow which is designed to "sweep" the volatiles away from the column; however, this does not entirely solve the problem. Efforts are underway to find the ultimate septum - one that contains zero contaminants and is long lasting.

Links:

• View Demo of Cepure Zero™ Injection Port Septa
• Injection Port Septa Products