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Fisherbrand™ 18mm PP Screw Seal, Black, open top, 18-400 thread, Assembled septum
Pre-assembled caps and septa are convenient and minimize contamination from handling.
2
Fisherbrand™ Septum for 18mm PP Screw Cap
Most septa are laminated on one side with PTFE for high chemical resistance and an inert barrier between sample and carrier material.
3
Fisherbrand™ 18mm PP Screw Seal, Black, Closed top, 18-400 thread, Assembled septum
Polypropylene caps are chemically inert and suitable for most chromatography applications.