Caps, Screw Top, with Soft-Guard, White Silicone Rubber / Red PTFE Pre-Slit Septa, bonded in "knurled", polypropylene, Blue Caps. For use with 9-425 mm thread, 12x32 mm autosampler vials. Soft-Guard Brand. 100/PK
Additional Info:
The 9502S‑E‑30C‑B Screw Caps feature bonded Soft‑Guard™ white silicone / red PTFE pre‑slit septa, integrated into a durable knurled polypropylene cap, designed for 9‑425 thread autosampler vials (12 × 32 mm).
These caps are engineered for low‑force needle penetration with strong resealing performance, delivering reliable, reproducible results in both routine and high‑throughput chromatography workflows.
✅ MICROSOLV’s most popular pre‑slit screw cap for HPLC and LC‑MS applications
Pre‑Slit Soft‑Guard™ Septa – Balanced Performance
Precision pre‑slit septa design enables:
Smooth, low‑force needle penetration
Reduced septum coring
Consistent resealing after injection
✅ Combines:
Ease of injection (vs non‑slit)
Better resealing (vs aggressive slit designs)
Soft‑Guard™ Technology – Reduced Downtime & Improved Data Quality
Bonded silicone/PTFE septa reduces:
Missed injections
Septum fragments (coring)
Autosampler interruptions
✅ Improves:
Injection reproducibility
Instrument uptime
Data consistency
Optimized Septa Specifications
Durometer: 40–50 Shore A
Thickness: 0.040 in ± 0.003 in
✅ Ensures optimal balance of:
Needle compatibility
Durability
Multi‑injection performance
9‑425 Format – Broad Instrument Compatibility
Fits 9‑425 thread autosampler vials
Designed for 12 × 32 mm vials
Recommended for:
Waters® Alliance systems
Waters® Acquity® systems
Most HPLC, LC‑MS, GC, and GC‑MS autosamplers
✅ Provides secure sealing across multiple instrument platforms
Polypropylene Cap Construction
Durable knurled polypropylene body
Easy handling for manual or automated workflows
Blue color coding for quick identification
✅ Supports efficient lab workflow and organization
Performance Advantage – Most Versatile Septa Type
Compared to other septa options:
✅ Pre‑slit (this product):
Balanced penetration + resealing (most versatile)
✅ Non‑slit:
Best resealing, higher needle force
✅ Star‑slit:
Easiest penetration, lower resealing
✅ Preferred for general‑purpose chromatography with consistent reliability
Helpful Resources & Links
Typical Applications
HPLC analysis
LC‑MS and LC‑MS/MS workflows
GC and GC‑MS applications
Pharmaceutical QC and validation labs
Environmental and food testing
High‑throughput analytical laboratories
Important Usage Notes
Designed for 9‑425 thread autosampler vials (12 × 32 mm)
Ideal for routine and multi‑injection workflows
Provides balanced performance across penetration and resealing needs
Verify compatibility with autosampler needle design and method parameters