Catalog Number - 95025-21

The 95025-21 MICROSOLV Headspace Septa are a made‑to‑order solution designed for 18 mm precision thread (ND18) screw‑top headspace caps (sold separately). These septa combine reddish brown butyl rubber with a grey PTFE layer, providing excellent sealing performance with improved chemical resistance.

With a slightly thicker 1.6 mm construction, these septa offer enhanced durability and versatility, allowing use as both a septa and a liner in appropriate ND18 configurations.

Custom Order Item – Critical Notice

• 🚨 Made‑to‑order product

• Non‑returnable and non‑cancelable once ordered

• May require:

  • Lead time

  • Availability confirmation

✅ Recommended for validated workflows requiring specific ND18 septa configurations

Designed for ND18 Screw Cap Systems

• Diameter: 17.5 mm septa

• Compatible with:

  • 18 mm precision thread (ND18) screw caps (sold separately)

✅ Ensures:

• Proper fit

• Reliable sealing performance

Butyl/PTFE Construction – Balanced Seal & Chemical Resistance

• Reddish brown butyl rubber / grey PTFE

• Combines:

  • Butyl elasticity → strong sealing

  • PTFE barrier → reduced chemical interaction

✅ Suitable for:

• routine to moderately sensitive headspace GC methods

• applications requiring improved inertness vs. butyl alone

Thicker Septa Design – Enhanced Versatility

• Thickness: 1.6 mm (slightly thicker than standard ND18 septa)

• Durometer: 55 Shore A

• Provides:

  • Improved durability

  • Better resistance to deformation

  • Extended use in repeated injections

✅ Can also function as:

• Septa insert

• Liner in ND18 screw cap systems

Septa Characteristics – Durable & Reliable

• Provides:

  • Consistent resealing

  • Controlled needle penetration

  • Stable performance across multiple injections

✅ Ideal for autosampler workflows with repeated injections

Bulk Packaging – High Throughput Efficiency

• 1000 septa per case

• Supplied in:

  • Polyethylene bags

• Designed for:

  • High‑volume laboratories

  • Routine and production environments

✅ Improves:

• Inventory efficiency

• Workflow continuity

Performance Positioning – ND18 Butyl/PTFE Versatile Option

• Compared to butyl‑only:

  • ✅ Improved chemical resistance

• Compared to silicone/PTFE:

  • ✅ Stronger sealing performance

• Compared to thinner ND18 septa:

  • ✅ Enhanced durability and liner capability

✅ Ideal for:

• ND18 screw‑top workflows

• routine QC laboratories

• applications requiring flexibility (septa or liner use)

Typical Applications

• Headspace GC analysis

• Pharmaceutical QA/QC

• Environmental testing

• Food and flavor analysis

• ND18 screw‑top autosampler workflows

Important Usage Notes

• Designed for:

  • ND18 screw‑top caps (sold separately)

• Ensure:

  • Proper placement depending on use (septa vs. liner)

✅ Best suited for:

• flexible, durable ND18 headspace workflows

🚨Made‑to‑Order & Pricing Information

This is a custom, made‑to‑order item.

• Please contact Customer Service for formal quotation, lead time, and ordering assistance. Classification: