Butyl Septa Used to Seal the GC Vial
https://www.hplcvials.com/products/6-20ml-gc-headspace/20mm.html

Butyl Septa Used to Seal the GC Vial

The butyl septa on the PTFE surface can be used in the headspace sample bottle to evaluate the injection activity and the penetration efficiency of methyl bromide on the activated carbon. The septum can be used to seal the vial during liquid sample collection for unmodified benzene analysis using HPLC method

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