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20662-U Supelco

Thermogreen® LB-2 Septa, solid discs

diam. 14 mm ( 9/16 in.), pkg of 50 ea



Related Categories Analytical/Chromatography, GC Accessories, Gas Chromatography (GC), Septa and Specialized Hand Tools, Thermogreen LB-2 GC Septa,
feature   operating range 100 ‑ 350 °C
packaging   pkg of 50 ea
diam.   14 mm ( 9/16 in.)


General description

An improved version over the original Thermogreen LB-1 septa.
• Extremely low bleed over a wide range of inlet temperatures (100 °C to 350 °C)
• Already conditioned, ready to use
• Easier needle penetration and high puncture tolerance (ideal for autosamplers)
• Rubber formulation exclusive to Supelco

Septum is a very important component of syringe injection system. They are usually fabricated from elastomeric, self-sealing materials such as silicone rubber, neoprene or fluoroelastomers. It is suitable to conveniently introducing the sample without causing the system to leak. Improper septa decomposes under the high-temperature conditions of capillary inlets causing baseline disruption and ghost peaks in a chromatogram.


Thermogreen® LB-2 Septa is suitable for the following applications:
• To minimize extraction onto or loss of analytes off the solid phase microextraction (SPME) fiber from the vial during analysis by GC-MS.
• Thermo-resistant septa is used in GC instrument to avoid carrier gas leaks, extraneous peaks and phthalate contamination.
• Thermo-resistant septa along with thick needle protector is used in GC instruments to avoid damage irreversibly caused by microsyringe.
• It is also used in the influent sampling ports in gas chromatographs.

Legal Information

Thermogreen is a registered trademark of Sigma-Aldrich Co. LLC

Price and Availability

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


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...

Peer-Reviewed Papers


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