Caps, Screw Top, with White Silicone Rubber / White PTFE, ultra-low bleed, Pre-Slit Septa, bonded in "knurled", polypropylene, Dark Blue Caps. For use with 9-425mm thread, 12x32mm autosampler vials. AQ Brand. 100/PK
Additional Info:
The 9509S‑30B screw caps are a high‑purity, low‑extractables solution with a pre‑slit septa design, developed specifically for autosamplers that require or strongly benefit from pre‑slit septa. They are widely selected as a cost‑effective, high‑performance alternative to certified autosampler caps, particularly in regulated and high‑sensitivity workflows.
These caps feature bonded septa construction, securing the white silicone rubber and white PTFE laminate firmly into the cap body. This bonded design minimizes the risk of septa movement, dislodgement, or plunge during repeated injections, supporting consistent autosampler operation and reduced variability.
The white PTFE ultra‑low bleed septa are engineered to deliver extremely low extractables and background contribution, making them an excellent choice for HPLC, LC‑MS, and LC‑MS/MS applications where baseline cleanliness and signal integrity are critical. The white PTFE facing avoids dyes and supports trace‑level and high‑sensitivity analyses.
The pre‑slit septa configuration allows easier and more reproducible needle penetration while maintaining reliable resealing, reducing injection force and needle wear. This makes the 9509S‑30B particularly well suited for Waters® Alliance and Acquity™ systems, as well as other autosamplers designed around pre‑slit septa performance.
The dark blue, knurled polypropylene caps provide secure handling and consistent sealing, delivering dependable performance for laboratories prioritizing instrument uptime, data quality, and long‑term cost efficiency.