CUSTOM ITEM: Caps, Screw Top, with Silicone Rubber / PTFE, ultra-pure, Pre-Slit Septa, fitted in knurled, polypropylene, Black Caps. For use with 9-425mm thread, 12x32mm autosampler vials. AQR Brand. BULK PRICING.
Additional Info:
Screw caps provide a secure, threaded sealing solution that ensures reliable and consistent performance in autosampler applications. The knurled polypropylene cap design allows easy handling and controlled tightening for repeatable sealing integrity.
The 9509S‑30C‑K AQR™ Screw Caps feature ultra‑pure silicone/PTFE septa manufactured without any added color pigments. By eliminating dyes in both the silicone and PTFE (Teflon®), these septa minimize extractables and background interference, making them ideal for high‑sensitivity analytical techniques.
This version incorporates a pre‑slit septa design, allowing easier needle penetration and reduced resistance during injection. Pre‑slit septa are especially beneficial for autosamplers such as Waters® Alliance and Acquity™ systems, where consistent needle alignment and smooth penetration are critical for reproducible results.
These caps are widely used in LC‑MS, LC‑MS/MS, and GC‑MS applications where both low extractables and reliable injection performance are required. They are also compatible as replacement caps in RSA‑Pro X kits, supporting validated workflows requiring ultra‑clean components.
Key Features & Benefits
Ultra‑pure septa ✅ No added color pigments for lowest extractables
Pre‑slit design ✅ Easier needle penetration and reduced resistance
Silicone/PTFE construction ✅ Maximum chemical resistance and purity
Low background interference ✅ Ideal for trace‑level analysis
Threaded screw cap ✅ Secure, leak‑resistant closure
Knurled cap design ✅ Easy handling and consistent sealing
AQR™ performance line ✅ Designed for ultra‑sensitive applications
Typical Applications
LC‑MS and LC‑MS/MS analysis
GC‑MS workflows
Trace‑level and impurity testing
Pharmaceutical and bioanalytical methods
Waters® Alliance and Acquity™ systems
High‑sensitivity analytical environments
Important Notes
For 9‑425 thread, 12 × 32 mm autosampler vials only
Pre‑slit septa improves penetration but may reseal slightly less than non‑slit designs
Recommended for systems requiring pre‑slit septa (e.g., Waters® autosamplers)
Designed for ultra‑low extractables and high‑purity workflows
Suitable for multiple injections depending on method requirements
This and other custom items are Custom Ordered and require quotation
Additional Resources
Custom Item Pricing Information