Screw cap, N 18, magnetic, silver, hole, butyl red/PTFE gray, 1.5 mm

Description

Compared to crimping, magnetic screw caps N 18 have a more convenient, consistent and secure sealing process (better reproducibility). The thinner septum (1.5 instead of 3 mm) facilitates needle penetration and reduces fragmentation (particularly important for SPME applications). They provide a flat surface for the magnet, so the filled bottle can fall off the magnet, as can be the case with crimped bottles due to the curvature of the cap.