SPME Vial Cap, 18 mm, Screw Thread with MicroCenter PTFE/Silicone Septa, 1000-pk.

Features & Benefits

• Micro-thin septum center pierces easily without bending needles or breaking SPME fibers.
• Thicker outer septum wall secures septum in place and ensures a tight seal.
• Versatile closures are suitable for SPME as well as dynamic and static headspace applications.
• Septa are manufactured from low-extractability silicone and molded for dimensional conformity.
• Available in magnetic 18 mm screw caps and 20 mm crimp caps.