Click HERE for Frequently Asked Questions (FAQ) about Autosampler Vials.

Click HERE to learn when to use Snap Caps or Screw Caps.

Click HERE for more information about PFAS Analysis.


No Application Notes information

Our goal is to provide the best Customer Experience possible. If you cannot find what you are looking for, have any questions or would like to give us a suggestion please use any of the following ways to contact us directly. We would love to hear from you.


We are always ready to lend any support we can. Our experienced scientists and professionals are ready to assist you with any technical support questions. Every question is considered a good question and we will work with you on a solution as fast as possible.


Range of Sizes & Colors | Storage and Autosampler Caps | Ultra Clean Septa

Screw Caps are the most popular closure for autosampler vials today. This is due to the great seal you can achieve and the wide variety of septa types and cap colors. It is important to know that screw caps should be matched to a vial with the same thread design including the thread pitch to prevent misalignment of the caps on the vial and subsequent leaking. All screw caps offered by MicroSolv™ are compatible with all vials we sell and are fully supported.

Click HERE for Screw Top Vial Ordering Page.


The Selection "FILTER" buttons refine the Products displayed in the Ordering Chart. They are described below and listed alphabetically by FILTER.

  • AQR™ Brand Caps - The highest quality of closure septa available anywhere. These caps are useful for MS/MS.

  • AQ™ Brand Caps - Comparable to industry leading "Certified" brands.

  • BASIK Brand™ Caps - Most economical, simple and basic. Manufactured to tight standards.

  • Cap Color: Black, Blue, Green, Grey, Natural, Purple, Red, White, Yellow.

  • Cap Style: Smooth - Most screw caps have a knurled cap that is intended to provide a "grip" when tightening. These "smooth" caps do not have the knurled edges and are softer to the touch. Septa can be Soft-Guard™ or BASIK™ types.

  • Magnetic - Plastic screw caps covered in a metal to be used in autosamplers that use magnets to move vials.

  • MicroSolv™ Brand Caps - Wide variety of septa and different style of caps for most needs. For MS/MS see AQR™ caps.

  • Screw Caps - Size: 10mm, 13mm, 8mm, 9mm, Open Hole or Solid. The most common screw cap for 2ml vials is the 9mm but some vials require 10mm or 8mm.

  • Septa: Cross-Slit, Low Bleed, Non-Slit, Polyethylene, Pre-Slit, PTFE Only, PTFE/Silicone Rubber/PTFE, White Silicone Rubber/Red PTFE, TEF or Y-Slit.

  • Soft-Guard™ Caps - Our most popular screw caps. Highest quality polypropylene caps with a proprietary blend of silicone rubber designed to minimize resistance for easy needle piercing, to reseal more and to prevent damage to the autosampler.

  • Solid Caps - Screw caps with liners for transportation or storage in screw top vials.

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