Caps, Screw Top, with White Silicone Rubber / White PTFE, ultra-low bleed 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‑10B screw caps are a high‑purity, low‑extractables solution developed for laboratories seeking performance comparable to certified autosampler caps, without the added cost or procurement constraints typically associated with certified brands.
These caps feature bonded septa construction, which securely anchors the white silicone rubber and white PTFE laminate into the polypropylene cap. This design helps prevent septa movement, dislodgement, or plunge during repeated injections—improving injection consistency and overall autosampler reliability.
The white PTFE ultra‑low bleed septa are manufactured to minimize extractables and background signal, making them particularly well suited for HPLC applications where cleanliness, reproducibility, and baseline stability are critical. White PTFE offers excellent chemical inertness and avoids the potential contribution of dyes, supporting trace‑level analytical workflows.
Designed for standard 9‑425 vial configurations, these caps are commonly selected as a trusted replacement for Waters® Certified caps, delivering comparable injection performance and cleanliness in routine and regulated HPLC environments—without the premium pricing or limited availability of certified consumables.
The dark blue, knurled polypropylene caps provide secure handling and consistent sealing across a wide range of autosamplers, making them a versatile choice for laboratories prioritizing data quality, uptime, and cost efficiency.