Catalog Number - 95020-45S-T

The 95020-45S-T MICROSOLV Headspace Caps are designed for high‑performance headspace GC applications using 18 mm precision thread (ND18) vials, combining blue silicone rubber / transparent PTFE septa with magnetic steel screw caps for secure sealing and automated handling compatibility.

Featuring an 8 mm center hole and ND18 threading, these caps provide tool‑free sealing, consistent autosampler access, and reliable sample containment in both manual and automated workflows.

Screw Top Design – ND18 Precision Thread

• ND18 (18 mm precision thread)

• Provides:

  • Fast, tool‑free sealing

  • Consistent closure torque

  • Simplified sample preparation

✅ Ideal for labs preferring screw‑top workflows over crimping

Magnetic Steel Caps – Automation Compatible

• Steel caps with magnetic properties

• Enables:

  • Robotic handling

  • Autosampler integration

• Silver finish:

  • Clean identification

  • Corrosion resistance

✅ Compatible with:

• CTC® autosamplers

• Agilent® headspace systems

• PerkinElmer TurboMatrix® 16, 40, and 110

• Other magnetic‑cap autosamplers

Silicone/PTFE Septa – High Purity Performance

• Blue silicone rubber / transparent PTFE

• Combines:

  • PTFE inertness (low bleed, low interaction)

  • Silicone flexibility (resealing and penetration)

✅ Ideal for routine to sensitive GC headspace analyses

Soft Septa – Easier Needle Penetration

• Durometer: 45 Shore A (soft formulation)

• Septa thickness: 1.3 mm

• Provides:

  • Reduced penetration force

  • Smooth autosampler operation

  • Reduced needle wear

✅ Improves injection reproducibility and system reliability

8 mm Center Hole – Balanced Access & Seal

• Provides:

  • Reliable needle access

  • Adequate sealing surface area

• Balances:

  • Seal integrity

  • Injection consistency

✅ Ideal for automated headspace workflows

Temperature Compatibility – Headspace Ready

• Suitable for:

  • Heated headspace GC

• Silicone/PTFE system supports:

  • Broad analytical temperature conditions

✅ Designed for routine and high‑purity workflows

Designed for ND18 Headspace Vials

• Compatible with:

  • 18 mm precision thread (ND18) headspace vials

✅ Ensures:

• Proper fit

• Consistent analytical performance

Bulk Availability

✅ Also available in larger quantities:

• Case Quantity Options for 95020-45S-T Headspace Screw Caps with Silicone/PTFE Septa (1000/Case and other bulk configurations available)

Performance Positioning – Screw Top + High Purity + Automation

• Compared to butyl/PTFE:

  • ✅ Lower extractables

  • ✅ Higher chemical inertness

• Compared to crimp caps:

  • ✅ Faster, tool‑free sealing

• Compared to non‑magnetic caps:

  • ✅ Autosampler compatibility

✅ Ideal for:

• automated GC headspace systems

• high‑purity analytical workflows

• routine and sensitive applications

Typical Applications

• Headspace GC analysis

• Pharmaceutical QA/QC

• Environmental VOC testing

• Food and flavor analysis

• Automated laboratory workflows

Important Usage Notes

• Designed for ND18 screw‑top vials (not crimp top)

• Magnetic caps:

  • Require compatible autosampler systems

• No crimping tool required

✅ Best suited for:

• automated, high‑purity headspace GC workflows