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22657 Supelco

SS-174 PTFE-Faced Septa

diam. 12.5 mm ( 1/2  in.)



Related Categories Analytical/Chromatography, GC Accessories, Gas Chromatography (GC), Non-Thermogreen GC Septa, SS-174 GC Septa,
material   off-white silicone body (123 mil thick)
  yellow PTFE face (2 mil thick)
packaging   pkg of 100 ea
diam.   12.5 mm ( 1/2  in.)


General description

PTFE-faced septa are suitable to overcome the degradation due to prolonged high temperatures which occurs in silicone rubber septa. The degradation results in baseline drift and additional peaks. It is generally fixed with the PTFE faced towards the column packing.

PTFE-faced septa are designed for applications where greater inertness is required. The off-white silicone rubber body (123 mil thick) provides plenty of support for the yellow PTFE face (2 mil thick). After the PTFE is ruptured during injection, some bleeding may occur. Because this bleed increases as more of the rubber is exposed, we recommend using a needle guide to reduce the size of the punctured area. For use with 200 °C to 300 °C inlet temperatures.

Safety & Documentation

Safety Information

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Protocols & Articles


GC Injection Port Issues: Two Case Studies (Peak Tailing and Low Response)

Introduction For the vast majority of uses, samples pass through an injection port at the start of the gas chromatography (GC) process. Therefore, it is very important to ensure that the proper injec...

GC Septa Use and Maintenance Tips

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 2) handling repeated puncturing by a...

Peer-Reviewed Papers


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