Caps, Headspace, Screw Top, with White Silicone Rubber / Blue PTFE Septa, fitted in Steel, Magnetic, Silver Caps with 8mm center holes. For use with 18mm Precision Thread Headspace Vials. BASIK Brand. 100/PK.
Additional Info:
The 95020-50S-W BASIK Headspace Caps are designed as an economical, high‑value solution for routine headspace GC applications, combining white silicone rubber / blue PTFE septa with magnetic steel screw caps.
These caps feature ND18 (18 mm precision threads) and an 8 mm center hole, enabling tool‑free sealing, consistent autosampler access, and compatibility with automated systems, while maintaining a low cost for budget‑focused laboratories.
Screw Top Design – ND18 Precision Thread
ND18 (18 mm precision thread)
Provides:
Tool‑free sealing
Fast sample preparation
Consistent closure
✅ Ideal for labs preferring screw‑top workflows without crimping tools
Magnetic Steel Caps – Automation Compatible
Steel caps with magnetic properties
Enables:
Robotic handling
Autosampler compatibility
Silver finish:
Clean appearance
Corrosion resistance
✅ Suitable for automated headspace GC systems
Silicone/PTFE Septa – Balanced High Purity Performance
White silicone rubber / blue PTFE
Combines:
PTFE inertness (reduced chemical interaction)
Silicone flexibility (resealing and durability)
✅ Suitable for routine to moderately sensitive analyses
Septa Characteristics – Balanced Durability
Thickness: 1.5 mm
Durometer: 50 Shore A
Provides:
Controlled needle penetration
Good resealing
Reliable multi‑injection performance
✅ Designed for routine laboratory use
8 mm Center Hole – Balanced Access & Seal
Provides:
Reliable autosampler access
Adequate sealing surface area
Balances:
Seal integrity
Injection consistency
✅ Ideal for automated workflows
Temperature Compatibility – Headspace Ready
Suitable for:
Standard headspace GC conditions
Silicone/PTFE construction supports:
Broad method compatibility
✅ Designed for routine analytical applications
Designed for ND18 Headspace Vials
Compatible with:
18 mm precision thread (ND18) headspace vials
✅ Ensures:
Proper fit
Reproducible analytical results
Bulk Availability
✅ Also available in larger quantities:
Performance Positioning – Economical Screw Top Option
Compared to premium silicone/PTFE:
✅ More economical
Compared to butyl/PTFE:
✅ Improved chemical inertness
Compared to crimp caps:
✅ Tool‑free sealing
Compared to non‑magnetic caps:
✅ Autosampler compatibility
✅ Ideal for:
budget‑conscious laboratories
routine QC workflows
high‑throughput environments
Typical Applications
Headspace GC analysis
Environmental testing
Pharmaceutical QA/QC
Food and flavor analysis
Routine 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:
routine, cost‑focused headspace GC applications