by
Kostaki » Wed Jan 16, 2019 12:55 am
James_Ball wrote:
We switched from crimp to screw caps for both GC and LC, even for the samples using Methylene Chloride as solvent.
Of course we went with the least expensive ones and the only thing I don't like is that if you don't immediately recap or make multiple injections before recapping I begin to see siloxane peaks showing up. These have a very thin PTFE liner on the inside and silicon rubber septa, probably would be better to have natural rubber instead, but those seem to be the more expensive option now. Once the teflon liner is punctured the bleed begins.
Yes I suppose that is always the risk in going for the cheapest caps.. Would be good to know if anyone has compared with more expensive caps?