Generally to avoid PFAS contamination it is recommeded to avoid the use of Silicone septa.

For this reason the preferred vial and cap combination is the Polypropylene 2mL screw thread vials with Polyethylene Solid caps which are star scored for better compatability with Autosamplers. They are available in 300ul and 750ul volumes.

300ul - PN 2ASRP-KS-U1

750ul - PN 2ASSP-KS-U1

One note is to avoid the alternative Polypropylene caps with Polypropylene vials. This is customer feedback when they were looking for an alternative supply from competitive offerings. This is their poor experience before sucessfully switching to the Pursuit Scientific Polyethylene Caps with Polypropylene vials to solve their issues:

We have had multiple issues with competitive vials/caps that we have been using for PFAS analysis:

1. The autosampler needle frequently becomes lodged in the polypropylene septa during injection, causing hardware errors.
2. In some cases, the needle lifts the entire vial after injection. The vial either remains stuck on the needle or drops somewhere into the autosampler.
3. Successful injections were only possible after increasing the autosampler temperature from the 10°C to 25°C. At 10°C, nearly every injection exhibited one of the above failures. Raising the temperature reduced, but didn’t eliminate, the problems.
4. Lot to lot variability. One lot performed without issues once the temperature was raised to 25°C.  The most recent order of caps gave us issues in over half our injections.