GC 7890B Leakage with graphite O-Ring (5180-4173)

Hello everyone,

As I want to run a higher S/SL injector temperature on my Agilent 7890B GC (approx. 320-360°C), I wanted to replace the previous Viton O-rings with the Graphite O-rings. Unfortunately, I can't get them to seal using the normal installation method.
In fact, the injector is so leaky that it can't even reach 10 psi inlet pressure. If I change back to the Viton O-rings, the S/SL injector is perfectly tight again.

Any tips/experience on this?

Many thanks in advance.

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