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

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


No Application Notes information

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Use with 11mm Snap Crimp Vials | Range of Colors & Septa | Standard or Soft

Snap Caps are easy to apply to the vial and useful for HPLC samples that are not highly volatile. The Snap Top vial and Snap Cap system is a "snap ring" cut into the top side of a vial and a cap with "lugs' that grab under the snap ring and creates a downward pressure on the septa creating a good seal.

It is important to know that Snap Caps should be matched to a vial with the same system design including the thickness and roundness of the "snap ring" to prevent misalignment of the caps on the vial and subsequent sample evaporation. All Snap Caps offered by MicroSolv™ are compatible with all Snap Top Vials we sell and are fully supported . Snap Caps are not recommended for GC with volatile solvents.

Click HERE for Snap Top Vials 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, Gold, Green, Natural, Red or Yellow.

  • Cap Style: Soft, most Snap Caps are made with a semi-stiff polyethylene which makes them rigid. Soft caps are made with a more pliable polyethylene and are softer.

  • Magnetic - Plastic Snap 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.

  • Septa: Types - Cross Slit, Low Bleed, Non-Slit, Other, Partial Slit, Pre-Slit, PTFE only, PTFE/Silicone Rubber/PTFE, Star Slit, Tan Color, White Sil/PTFE/Sil or Y-Slit

  • Soft-Guard™ Caps - Our most popular snap 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.

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