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2ml 9mm Vial Blue Screw Neck Sample Vial Caps Sc94491. Material Composition: Manufactured from Clear or Amber borosilicate glass for chemical resistance. Cap Options: Available with black or blue screw caps with 9mm thread. Septa Quality: 9mm PTFE/silicone septa with excellent chemical inertness and acid/alkali resistance. Design Feature: Short screw thread ensures proper centering of limited volume inserts. Opening Size: 40% larger opening designed for easier sample preparation. Autosampler Compatibility: 9mm screw vials compatible with all common autosamplers. Certifications: CE and ISO certified for quality assurance. Customization Service: OEM and ODM services available for custom branding and design.