Caps, Headspace, Screw Top, with White Silicone Rubber / Blue PTFE SPME Style Septa, fitted in Steel, Magnetic, Silver Caps with 8mm center holes. For use with 18mm Precision Thread Headspace Vials. MicroSolv Brand. 100/PK.
Special Shape Septa with thick outer ring and thinned center provides a good sealing with the vial and a target area easer for needles to penetrate. Recommended with CTC Combi Pal® and other autosamplers with SPME or Solid Phase Micro-Extraction injectors.
Cap has ND18 Screw Threads.