Catalog Number - 9504S-35C-BLK

The 9504S‑35C‑BLK BASIK™ Screw Caps are selected for chromatography workflows requiring reliable autosampler sealing and smoother needle penetration at an economical cost for 4 mL vial applications. The fitted silicone rubber/PTFE pre‑slit septa configuration supports easier autosampler needle entry and dependable resealing during routine analytical use.

Manufactured with black knurled polypropylene caps and fitted silicone rubber/PTFE pre‑slit septa, these caps are designed for use with standard 13‑425 thread, 15 × 45 mm autosampler vials commonly used in older Waters® autosampler systems.

Pre‑Slit Septa Configuration

• Silicone rubber/PTFE pre‑slit septa

• Easier autosampler needle penetration

• Reduced injection force

• Reliable resealing performance

✅ Consistent autosampler operation

Economical Cap Design

• Cost‑effective cap configuration

• Designed for routine analytical workflows

• Suitable for repeated injections

• Dependable sealing performance

✅ Economical chromatography consumable

Legacy Instrument Compatibility

• Recommended for systems comparable to:

  • Older Waters® autosamplers

• Designed for established analytical workflows

• Suitable for 4 mL vial applications

✅ Optimized for legacy autosampler systems

13‑425 Thread Compatibility

• Fits 13‑425 screw thread vials

• Compatible with:

  • 15 × 45 mm autosampler vials

  • 4 mL autosampler vials

  • Industry standard autosampler formats

✅ Broad autosampler compatibility

Knurled Polypropylene Caps

• Black polypropylene construction

• Knurled exterior improves:

  • Grip

  • Installation

  • Removal

• Reliable sealing performance

✅ Convenient laboratory handling

Routine Chromatography Applications

• Suitable for:

  • HPLC analysis

  • GC workflows

  • 4 mL autosampler vial applications

  • Routine analytical testing

✅ Ideal for everyday chromatography workflows