ND18 Headspace Screw Neck (10–20 mL)

18mm Silver Magnetic Screw Cap, blue PTFE/white Silicone, Close top

Catalog #: ND18 SPME Headspace Screw Caps

18mm headspace screw steel magnetic caps with PTFE/Silicone septa, fitting 1.3mm or 1.5mm thin septa. Ideal for GC headspace vials.

Available SKUs

Model Specification MOQ
NKSSC-18M-F-C 18 mm Silver Magnetic Screw Cap, blue PTFE/white Silicone Septa, Close top 1 pk
Ships within 5-7 business days
Certificate of Analysis included
Quality guaranteed

Product Overview

18mm headspace screw steel magnetic caps with PTFE/Silicone septa, fitting 1.3mm or 1.5mm thin septa. Ideal for GC headspace vials.

Research Applications

  • Thinner septum (1.3 mm or 1.5 mm) allows easier needle penetration with less fragmentation, ideal for SPME applications.
  • Compatible with 10 mL and 20 mL precision screw headspace vial.
  • Compared to 20 mm crimp caps, 18 mm magnetic screw caps offer a more convenient, stable, and safer sealing process with improved reproducibility.
  • Magnetic Cap: Compatible with automated samplers allowing magnetic picking for ease of handling.
  • The thinner septum (1.5 mm vs. 3 mm) allows easier needle penetration with reduced fragmentation, particularly important for SPME applications.

Key Features

  • The flat cap surface ensures secure magnetic handling, preventing filled vials from dropping as can occur with over-crimped caps due to cap convexity.

Technical Support

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OEM Services

Need modifications or larger quantities? Request a custom synthesis quote.

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Closure type Screw closure (Closed-top)
Nominal diameter N 18
Cap color Silver
Cap material Metal (magnetic)
Septa thickness 1.5 mm
Septa material blue PTFE/white Silicone
Autosampler CTC, Shimadzu
Recommended application Headspace, SPME

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Need OEM or a Custom Configuration?

We support practical, production-ready customization for vials, caps, and septa. Share your autosampler type, dimensions, septa preference, and packaging needs—our team will confirm feasibility and lead time.

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