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18mm Screw Neck Closures
https://aijirentechinc.com/products/10-20ml-18mm-screw-gc-vial-nd18.html

18mm Screw Neck Closures

Aijiren’s Septa made of high-quality raw materials can protect the seal inside the Vial to a certain extent, and will not break or fall off the cap after the automatic injection needle is punctured. This is to a large extent. Gas chromatography experiments provide convenience, and bring safe and accurate results.

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The 18mm Screw Neck Aluminum Cap produced by Aijiren is made of high-quality aluminum with clear threads to ensure the tightness of the seal. Aijiren uses PTFE and Silicone or PFTE and Butyl to make Septa, even with a central hole, enough thickness Septa can also isolate air and pollution, and protect the samples in the vial from interference.
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