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.