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. 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 reliable tightening for repeatable sealing.
The 9504S‑30C‑BK 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 these caps particularly useful for autosamplers where accurate alignment is critical.
These caps are commonly recommended for older Waters® autosampler systems, where pre‑slit septa can help improve injection consistency and reduce needle wear. The PTFE layer provides chemical resistance and sample protection, while the silicone backing offers resealing capability for multiple injections.
Designed specifically for 15 × 45 mm, 4 mL autosampler vials, these caps support both analytical workflows and routine laboratory use. The black polypropylene cap is suitable for light‑sensitive samples and organized workflow identification.
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
Typical Applications
HPLC and UHPLC analysis
LC‑MS workflows
Older Waters® autosampler systems
GC and routine analytical applications
Use with 4 mL (15 × 45 mm) autosampler 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
This and other custom items are Custom Ordered and require quotation
Additional Resources
Custom Item Pricing Information