How to Minimize Septum Problems in GC | American Laboratory There are several precautions that can be taken to reduce the impact of septum degradation/bleed: Avoid the septum and use valve injection. This is not always possible but will prevent the septum problem. A valve and sample loop can be mounted before the splitter, and the coupling with the septum cap or through it can be made of clean materials. Capillary Split/Splitless Injector for the Clarus 590/690 GC cooler septum cap to reduce...

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