CUSTOM ITEM: Caps, Screw Top, with PTFE, ultra-pure Septa, fitted in "knurled", polypropylene, Black Caps. For use with 9-425mm thread, 12x32mm autosampler vials. AQ Brand. BULK PRICING.
Additional Info:
Screw caps provide a secure, threaded sealing solution that ensures consistent and leak‑resistant performance in autosampler applications. The knurled polypropylene design allows for easy handling and controlled tightening to achieve reliable closure.
The 9509S‑50C‑B AQ™ Screw Caps feature a PTFE‑only septa with no elastomeric backing. This design provides the highest level of chemical inertness and eliminates potential sources of contamination such as silicone extractables or leachables, making these caps ideal for ultra‑sensitive analytical methods.
Because PTFE does not reseal after puncture, these caps are best suited for single injections or use with non‑volatile samples where resealing is not required. This makes them particularly valuable in trace‑level analysis, where minimizing background interference is critical.
The black polypropylene cap supports sample identification and is also suitable for light‑sensitive samples while maintaining compatibility across HPLC, LC‑MS, and GC workflows.
Key Features & Benefits
PTFE‑only septa ✅ Maximum inertness and purity
No elastomer backing ✅ Eliminates extractables and leachables
Ultra‑low background ✅ Ideal for trace‑level analysis
Threaded screw cap ✅ Secure, leak‑resistant sealing
Knurled cap design ✅ Easy handling and consistent tightening
Black cap format ✅ Suitable for light‑sensitive samples
AQ™ quality ✅ Designed for clean analytical performance
Typical Applications
LC‑MS and LC‑MS/MS analysis
GC and GC‑MS workflows
Trace‑level and ultra‑clean analytical methods
Single‑injection analyses
Non‑volatile sample testing
Important Notes
For 9‑425 thread, 12 × 32 mm autosampler vials only
PTFE‑only septa will not reseal after needle puncture
Not recommended for multiple injections
Not recommended for volatile samples
Designed for maximum inertness and lowest extractables
This and other custom items are Custom Ordered and require quotation
Custom Item Pricing Information