Mass Spec Vial Test Parameters include: Glass – Type 1, Class A, 33 Expansion Clear or Amber Borosilicate Dimension – Height, Diameter, Bottom Thickness, Neck Length, Thread Profile, Annealing Cap/Septum – Diameter, Height, Thread Integrity, Center Flash, Septa Insertion GC/MS Background Test LC/MS Background Test Particle Counts – Particle Size, Particle/mL/Vial Mass Spec Vials are available with or without graduated marking spots. You may choose from bonded PTFE/Silicone or bonded PTFE/Silicone with slit septa. Our sealed and re-closeable container includes: 100 - Certified 2.0mL screw thread vials 100 - 9mm royal blue closures with bonded septa Certificate of Conformance.