9mm magnetic short thread closures are specialized laboratory screw caps designed for automated chromatography autosamplers that use magnetic transport systems. They combine the convenience of a 9mm threaded screw cap with a magnetic metal exterior, eliminating the need for manual crimp tools while ensuring smooth robotic handling in GC, HPLC, and LC-MS systems.
Key Features & Specifications
Design: Open-top short-screw cap allowing direct needle penetration.
Material: Magnetic steel or lacquered magnetic outer shell (commonly silver or gold) with a polypropylene core.
Dimensions: Standard 9mm thread size (approx. 10.2 mm outer diameter with a 5.1 mm height).
Septa: Usually pre-assembled with high-purity Silicone/PTFE (often pre-slit to prevent needle damage and vacuum formation).
Common Laboratory Applications
Autosampler Compatibility: Works seamlessly with magnetic robotic arms from brands like Agilent, Shimadzu, and CTC Analytics.
Analytical Techniques: Widely used in Gas Chromatography (GC), High-Performance Liquid Chromatography (HPLC), and headspace analysis.
Sample Integrity: Prevents evaporation and contamination better than traditional loose-fitting caps, while avoiding the risks of over- or under-crimping.
