CUSTOM ITEM: Caps, Screw Top, with Silicone Rubber / PTFE Pre-Slit Septa, bonded in "knurled", polypropylene, Black Caps. For use with 13-425mm thread, 15x45mm autosampler vials. MICROSOLV Brand. 1000/CS.
Additional Info:
Screw caps provide a secure, threaded sealing solution that ensures consistent and leak‑resistant performance in autosampler applications. The knurled polypropylene design enables easy handling and consistent tightening for repeatable sealing across large sample sets.
The 9504S‑30C‑BK‑M Screw Caps feature bonded silicone/PTFE pre‑slit septa designed to reduce needle resistance and improve penetration consistency. The pre‑slit construction increases the effective needle strike area, making injections easier and more reproducible, particularly in older autosampler systems.
These caps are commonly recommended for older Waters® instruments, where pre‑slit septa can improve autosampler performance and consistency. The PTFE layer provides chemical resistance and protects sample integrity, while the silicone backing supports resealing for multiple injections.
Designed specifically for 15 × 45 mm, 4 mL autosampler vials, these caps are well suited for high‑throughput analytical workflows. The black polypropylene cap is ideal for light‑sensitive samples and supports organized laboratory operations.
Key Features & Benefits
Pre‑slit septa ✅ Easier needle penetration and reduced resistance
Silicone/PTFE construction ✅ Chemical resistance and sample protection
Bonded septa ✅ Secure fit and consistent performance
Threaded screw cap ✅ Leak‑resistant, reliable sealing
Knurled cap design ✅ Easy handling and proper tightening
Black cap format ✅ Suitable for light‑sensitive samples
Case quantity ✅ Ideal for high‑volume laboratory use
Typical Applications
HPLC and UHPLC analysis
LC‑MS workflows
Older Waters® autosampler systems
GC and routine analytical applications
High‑throughput laboratories using 4 mL vials
Important Notes
For 13‑425 thread, 15 × 45 mm autosampler vials only
Pre‑slit septa improves penetration but may reseal less effectively than non‑slit septa
Suitable for multiple injections depending on method requirements
Designed for compatibility with legacy autosampler systems
Case quantity format (1000/CS)
This and other custom items are Custom Ordered and require quotation
Custom Item Pricing Information