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This clear borosilicate glass vial has a thin 0.060in PTFE/Silicone septa. thin septum is easy to puncture with syringe needles, and is ultrasonically bonded to the 24-414 Polypropylene closure. No adhesives are used, ever. I-Chem certified 200 and 300 Series vials are guaranteed to meet the EPA's performance based specifications for volatile organic analysis. Also TOC certified. Capacity: 40mL. Closure Size: 24-414. Series: 200. Closure Material: Polypropylene. Dimension: 1.06 O.D. x 3.75in H. Cap Type: Open top. I-Chem Brand #: T236-0040.