Aijiren autosampler vials cover a wide range of applications, from microsampling to headspace analysis. 4ml 13-425 Screw Thread Vials are manufactured of Clear, or Amber borosilicate glass and include a write-in patch for sample identification. Available with graduated marking spots. Our septa use only the highest quality materials to ensure proper function and can be pre-slit to ease needle penetration. When paired with Aijiren’s cap& septa, our screw or crimp caps securely seals your samples and helps prevent sample loss from evaporation. 13-425 Screw Thread Vials are manufactured from Type 1 borosilicate glass, available in clear or amber, or from Polypropylene. Excellent for long-term storage.