Use certified clean, low particle, low background vials for your LC/MS, GC/MS and chromatography high sensitivity applications. Thermo Scientific™ 9mm Amber Glass Screw MS Certified Vial Convenience Kits are fully lot-tested by multiple methods for 15 critical parameters. Every pack comes with a Certificate of Conformance. Manufactured from superior quality 33 expansion borosilicate clear (Type 1, Class A) glass, vials are available in assembled and unassembled kits. An assortment of wide opening 9mm vials and a selection of closures are available to suit your application.