The glass wool in packed liners from the manufacturer is moving after a couple weeks of injections on the GC-FID. It is only happening on one out of the 6 GC systems. One cause for this that I was told is that the glass wool packing may be inconsistent, but this doesn't seem likely since the other instruments are ok. The other thing I have been told is that the split vent trap may be plugged and therefore causing back pressure and the wool to move. Does any of these sound plausible or do you have any other solutions? I prefer not to pack them in house. Thanks.
Higher pressure will definitely shift the position of the glass wool in the liner. As you indicated, if the split vent trap is partially clogged this may disposition the glass wool. Track the pressure during injection for your 6 GC system. Since you have stated only one of your GC instruments is showing this displacement then it would be reasonable to check for any abnormal increase in the injection pressure.
1.Sample reaction and degradation
2. Needle depth
3.irregular gas linear velocity
- Check your septum. Leakage in the septum may cause glass wool to move during needle exit.
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