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20418 Sigma-Aldrich

Three Layer Disc Septa

diam. 12.5 mm ( 1/2 in.), pack of 12



Related Categories 3-Layer GC Septa, Analytical/Chromatography, GC Accessories, Gas Chromatography (GC), Non-Thermogreen GC Septa,
packaging   pack of 12
mfr. no.   Hamilton, 76006
application(s)   gas chromatography (GC): suitable
diam.   12.5 mm ( 1/2 in.)


General description

These septa feature a soft inner layer of silicone rubber sandwiched between hard outside layers. For use with GC inlet temperatures up to 200 °C.

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Safety & Documentation

Safety Information

Safety Information for this product is unavailable at this time.


Certificate of Analysis

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...

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