9mm Silicone and Teflon Septa for Screw Cap
https://www.hplcvials.com/products/1-4ml-hplc-uplc-gc/9mm.html

9mm Silicone and Teflon Septa for Screw Cap

Teflon and silicone rubber or ultra-pure silicone are used as raw materials to ensure that the septa are non-toxic; to ensure excellent functions, it is particularly suitable for gas chromatography, and to ensure that the septum does not fall into the sample vial during the injection process

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