11mm PTFE Septa for HPLC Vials
https://www.hplcvials.com/products/1-4ml-hplc-uplc-gc/11mm-crimp-ring.html

11mm PTFE Septa for HPLC Vials

PTFE is the most inert but its poor resealability making it unsuitable for multiple injections or storage. For layered septa such as PTFE/silicone the chemical resistance of the septa is that of PTFE until the septum is punctured. Once punctured, the silicone layer is exposed and able to react with sample/solvent so the chemical resistance of silicone should be considered when using these septa.

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