Transparent TPX (polymethylpentene) polymer vial body with 200uL silanized glass fused insert. Minimum workable volume 25uL. Set the needle stroke 3-4mm less than the default value to prevent needle damage. Compatible with any 9mm, short thread cap. For PFAS analysis use cap 220-97331-91 with PP (polypropylene)-lined silicone septum for multiple injections per vial, or septumless PE cap 220-91521-12 (not resealable) for a single injection.