How to Choose the Best Strorage Vials – Copy
Screw thread vials are common for LC sample analysis as well as sample or standard storage. But is there a difference between autosampler vials and storage vials? Typically, autosampler vials used for LC analysis are 2 mL with a 9 mm screw thread, open top cap and septa. On the other hand, storage vials come in sizes ranging from 2 mL up to 32 mL, and the closures are typically solid top, lined caps with different threading.
Figure 1 Autosampler Vial Cap vs Solid Top Storage Cap
2 mL Autosampler Vial vs. 2 mL Storage Vial
Both 2 mL autosampler vials and 2 mL storage vials are 12×32 mm in size. For most of our LC customers that prefer a screw thread vial, we recommend a 9 mm wide mouth vial, as they offer a 40% wider opening than the 8-425 screw thread vials. However, for storage of volatile compounds or long term storage (for standards, etc.), we recommend the smaller opening 8-425 option. The 8-425 vials have more threads per inch than the 9 mm vials, which keeps a tighter seal.
igure 2 8-425 vs 9 mm vs 10-425 vial threading
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