CUSTOM ITEM: Caps, Screw Top, with Silicone Rubber / PTFE, ultra-pure 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 consistent and reliable performance across autosampler applications. The knurled polypropylene cap design allows for easy handling and controlled tightening to achieve optimal sealing conditions.
The 9509S‑10C‑K AQR™ Screw Caps feature ultra‑pure silicone/PTFE septa manufactured without any added color pigments. By eliminating dyes from both the silicone rubber and PTFE (Teflon®), these caps significantly reduce potential extractables, making them ideal for ultra‑sensitive analytical techniques.
This ultra‑clean construction minimizes background interference and contamination risk, which is critical for trace‑level detection in LC‑MS, LC‑MS/MS, and GC‑MS workflows. The septa provides reliable resealing for multiple injections while maintaining chemical resistance and sample integrity.
These caps are also commonly used as replacement caps in RSA‑Pro X kits, offering flexibility across validated workflows requiring ultra‑low extractables.
Because these caps are non‑slit, they provide superior resealing compared to pre‑slit options. However, they are not recommended for Waters® Alliance, Acquity™, or other autosamplers that require pre‑slit septa for proper needle penetration.
Key Features & Benefits
Ultra‑pure septa ✅ No added color pigments for lowest extractables
Silicone/PTFE construction ✅ Maximum chemical resistance and cleanliness
Low background interference ✅ Ideal for trace‑level analysis
Non‑slit septa ✅ Superior resealing for multiple injections
Threaded screw cap ✅ Secure, leak‑resistant closure
Knurled cap design ✅ Easy handling and consistent tightening
AQR™ performance line ✅ Designed for highest purity applications
Typical Applications
LC‑MS and LC‑MS/MS analysis
GC‑MS workflows
Trace‑level and impurity profiling
Pharmaceutical and bioanalytical testing
High‑sensitivity analytical methods
Important Notes
For 9‑425 thread, 12 × 32 mm autosampler vials only
Non‑slit septa (not ideal for systems requiring pre‑slit designs)
Not recommended for Waters® Alliance, Acquity™, or similar autosamplers
Suitable for multiple injections with strong resealing performance
Designed for ultra‑low extractables and high‑purity applications
This and other custom items are Custom Ordered and require quotation
Additional Resources
Custom Item Pricing Information