GC septa

Inert | Low bleed | Long lifetime

Quality injection port septa
for GC analysis

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Trajan’s CRS GC septa is founded on unique technologies the optimize the performanceof the injection port. CRS GC septa ensures:• Very high temperatures of operation.
• Exceedingly tight requirements for low emission of volatile and liquid components.
• Resistance to sticking.

Inert | Low bleed | Long lifetime

CRS GC septa
CRS GC septa are preconditioned for low bleed, plasma-coated to reduce sticking and are
packed in blister packs and glass jars for high purity. We have developed unique technologies in
the course of developing injection port septa for gas chromatographs. This particular applicationis characterized by very high temperatures of operation – to the limit of the material specification;
Exceedingly tight requirements for low emission of volatile and liquid components, and a surface
that needs to be resistant to sticking.

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Injection port | GC septa
High temperature performance
Accelerated high-temperature tests show adhesion of silicone rubber formulations
to a steel plate, with and without the non-stick coating. The difference in adhesion isreadily apparent. In actual use this performance means easier septum removal andless injection port cleanup.

Plasma coating• Non-stick surface treatment.
• Easy to change even with high temperatures.
• Stays clean, does not attract dust.

Exposed to dust
Uncoated

CoatedCleaned with air
Uncoated

CoatedQuality injection port septa for GC analysis
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Center guide and pre-pierced advantage• Center point guides the needle for easy penetration.
• Reduces needle bending.
• Reduces coring and tearing.
CRS GC septa in BTO, AG3 and Marathonformulations are precision molded with arecess on the injection side, to guide thesyringe needle to the same point with every
injection. The center guide design requires
less force on initial penetration for a smootherfeel. Pre-pierced septa give long injection life
for autosampling, reduce coring, and enhancereliable performance.

Center guide recessBTO

AG3

Center guide andpre-pierced

MarathonNon-center guide andnon-pierced

GC septa

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Injection port | GC septa
BTO premium high-temp GC septa
GC septa BTO is bleed and temperature
optimized for the most demanding GC andGC-MS applications: it is the finest GC septum
we have tested. GC septa BTO is formulated toextend low bleed and outstanding mechanicalproperties of premium GC septa to the highest
temperature applications. It retains remarkable
softness and pierceability at high temperatures,with extremely low bleed, and has been
optimized to reduce injection port adhesion.

AG3 low-bleed GC septa
The CRS Advanced Green 3 (AG3) GC septum
was created to combine significantly longer
injection life, low bleed and low injection portadhesion. The result is a green septum you canuse for all your critical analyses.

Marathon long-life GC septa
This is an advanced GC septum for autosampler
use, with significantly longer life. The CRS
Marathon GC septum typically achieves 400
injections without failure when used with arounded-tip (HP-style) needle and autosampler
or needle guide. Now you can make extended
autosampler runs without fear of sample loss
caused by blow-back of leaking carrier gas.
The CRS Marathon GC septum is also ideal forstandard manual injection GC and GC-MS.

Quality injection port septa for GC analysis
5General purpose blue GC septa
We offer general purpose blue GC septa thatare economical and suitable for use in many
applications. While they do not have the lowbleed quality or plasma coating of the premium
GC septa they do hold up well at up to 275°C
and provide lower bleed levels than many
low-end or generic GC septa.

Puresep T GC septa
The CRS Puresep T GC septa are faced withpolyimide film and have a double layer ofpolyimide and PTFE on one side. Puresep TGC septa are not low bleed septa, and theirrecommended maximum temperature is 225°C.
Puresep T GC septa are stamped from sheetsof material to the size specified. All general
purpose septa are produced to tight tolerances
in dedicated molds.

GC septa

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Injection port | GC septa
Endura-Seals GC Septa
Endura-Seals are a patented alternative to typical silicone-rubber injection port septa for gas
chromatography. They work in a 2-part sealing system that includes the septa and the sealing nut.
The duckbill valve and wiper seal combination in the Endura-Seals is much more resistant toneedle wear and tear than traditional pierced septa. While premium septa are already designed toreduce coring (particles in the liner), the Endura-Seals allow the needle to glide through the valve
to virtually eliminate such particles. The Endura-Seals utilize a more cost-effective elastomericspring design instead of the metal spring used in some competing designs. These features makethe Endura-Seals GC septa an ideal choice for automated analyses in the long sequences usedwith today’s high capacity autosamplers.
The Endura-Seals are available in 11 mm and Shimadzu style kits. Each kit includes 1 sealing nut and2 septa. 11 mm Endura-Seals will fit in most instrument ports without the need for an adapter kit.

11 mmShimadzu

Quality injection port septa for GC analysis
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GC septa
Quality injection port septa for GC analysis.

BR-0612-G_RevA © Trajan Scientific Americas Inc 10/2022

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