Screw Cap for 13mm Vial 13-425 Open-top with Septum

The 13-425 Open Top Screw Cap with Pre-Assembled Septa from vialshop.com is a ready-to-use closure designed for high-performance liquid chromatography (HPLC), gas chromatography (GC), and general sample analysis. Molded from high-purity, chemically inert polypropylene (PP), each cap comes pre-assembled with a 1.5mm PTFE/Silicone septa to eliminate tedious hand assembly and minimize risk of sample contamination.

The center-hole open-top design allows autosampler needles to easily pierce the septum while maintaining an airtight, evaporation-resistant seal around the vial.

Key Features

• Pre-Assembled Efficiency: Caps and septa arrive ready to use out of the box—saving lab prep time and reducing manual handling contamination.

• PTFE/Silicone Septa (1.5mm Thick): High-grade PTFE barrier faces the sample for chemical resistance, backed by self-sealing silicone for smooth needle penetration and resealing.

• Open-Top Center Hole: Engineered for seamless needle insertion in automated HPLC/GC injections and manual sampling.

• Chemically Inert Polypropylene (PP): Resistant to acids, alkalis, and common organic solvents used in chromatography.

• Standard 13-425 Threading: Guarantees a precise, leak-proof fit on all standard 13mm screw-neck autosampler vials.

Technical Specifications

Common Applications

• HPLC & GC Chromatography: Perfect for automated sample injections in high-throughput liquid and gas chromatography.

• Autosampler Injection Vials: Provides consistent needle penetration without coring or damaging autosampler components.

• Analytical Testing & Research: Ideal for environmental testing, pharmaceutical QA/QC, life sciences, and chemical analysis.