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That is the septa, the one we do not reuse in the GC analysis, otherwise the number of needles is too much to be affected by the mat debris, the pre-slit stpta for the liquid phase will be used repeatedly.
If you are worried about the price of PTFE septa and worry about the volatilization of the solvent, give you a suggestion:
No need for the mat, after the volume is fixed, the cap is sealed with a sealing film. After the needle is inserted, it can be stored for a short period of time, but it is still not used for the sample with acetone solvent, and the sealing film will dissolve.
This is the end of the introduction of Can the GC analysis vials be used again. I hope it can help you.