Use certified clean, low particle, low background vials for you high sensitivity LC/MS and GC/MS applications. They are fully lot-tested for 15 critical parameters. Thermo Scientific™ Clear 11mm Snap Top MS Certified Vials are available in 2mL volumes. Septa are PTFE/Clear Silicone, Pre-slit. Pre-cleaned vial packaging protects the product integrity and high purity closures packed in air-tight re-closeable container.