11-425 Snap Cap Preassembled PTFE / Silicone Snap Open Cap with Hole Microlab Scentific
11mm Snap caps provide a secure seal, minimizing evaporation even with volatile samples, the audible click ensures that a secure seal has been formed and the cap is properly applied. Snap caps have septa pre-assembled, Snap caps are compatible with Aijiren Vials and other snap-ring style vials.
Caps and Septa
Pre-slit or Not
- Chromatography septas can be pre-slit or not and must be considered by evaluating a few factors. A pre-slit septum is an ideal choice in applications requiring 20% or more of the sample injection each time from the vial so that suction is avoided.
- The slit allows ambient gas to equalize the gas in the vial so that a vacuum is not created in the vial from the tight seal around the needle. If coring or clogging from a narrow needle or needle deflection from highly durable septa material is a concern, then choosing a pre-slit septum is a better choice.
- The non-pre-slit septas help to reduce carryover from vial to vial because the resealing characteristics of the septum act as a squeegee to wipe solution from the outside of the needle. Typically, a non-slit septum exhibits resealing capabilities for a limited number of needle punctures but for long-term storage in the vial, using a new non-punctured septum is best practice.