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$24.00
Sku: HPLC-112211
Availability:
QUICK SHIP
In stock & estimated to ship in 1-2 days by July 15, 2026
Description
In gas chromatography (GC) and autosampler-based analytical workflows, sample integrity is highly dependent on reliable vial sealing. Volatile compounds, solvent evaporation, and septa failure can introduce variability and compromise analytical accuracy during injection sequences.
High-throughput laboratories require consistent, chemically resistant sealing systems that maintain sample stability throughout storage and automated injection. Poor cap-septa compatibility or low-quality sealing components often lead to leakage, analyte loss, and inconsistent chromatographic results.
9 mm Screw Top Caps for 9-425 GC Vials are designed to provide secure and reproducible sealing for chromatography workflows. The PP cap combined with PTFE/red silicone bonded septa ensures chemical resistance, mechanical durability, and compatibility with standard autosampler vial systems used in GC analysis.
Specification
| Cap Color | Blue |
| Cap Material | Polypropylene |
| Cap Size | 9 mm |
| Certified | No |
| Includes Septa | Yes |
| Pre-Slit Septa | No |
| Product Type | Caps & septa |
| Repeat Injections | No |
| Septa Layering | Bi-Layer |
| Septa Material | PTFE/red silicone |
| Technique | GC |
| Thread Size | 9-425 |
| UNSPSC Code | 41121806 |
| Vial Type | Screw |
Features
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9 mm screw cap designed for 9-425 GC vial compatibility
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Blue polypropylene cap body provides chemical resistance and mechanical stability
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PTFE/red silicone bi-layer septa for inert sealing and injection penetration
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Bonded septa structure ensures consistent alignment and leak reduction
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Optimized for gas chromatography and autosampler injection systems
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Supports volatile and semi-volatile sample handling workflows
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Suitable for single-injection analytical procedures
Applications
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Gas Chromatography (GC) sample sealing and injection
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Volatile Organic Compound (VOC) analysis
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Environmental testing (air, water, soil extracts)
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Pharmaceutical residual solvent analysis
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Food flavor and aroma compound analysis
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Chemical and analytical research workflows
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Autosampler-based high-throughput chromatography systems
Technical Insight
The PTFE layer provides a chemically inert barrier that reduces solvent interaction and analyte adsorption, while the red silicone layer ensures elasticity for syringe penetration during autosampler injection. This dual-layer septa design is widely used in GC vial caps to balance chemical resistance and sealing performance.
Frequently Asked Questions
What are 9 mm screw caps used for?
They are used to seal 9-425 GC vials in gas chromatography workflows, ensuring sample stability and preventing evaporation or contamination.
What is PTFE/red silicone septa used for?
PTFE provides chemical resistance, while silicone allows needle penetration and resealing during autosampler injection.
Are these caps compatible with GC autosamplers?
Yes, they are designed for standard 9 mm / 9-425 GC autosampler vial systems.
Can these caps be used for multiple injections?
They are designed for single-injection workflows. Repeated puncturing may reduce sealing performance.
What type of samples are suitable?
They are suitable for volatile and semi-volatile samples including environmental, pharmaceutical, and chemical analysis applications.
When can I expect my order to ship?
Most orders are filled and shipped within 2-3 business days from the time they are received.
Our standard shipping usually take 2-5 days.
We also provide express shippping for time-sensitive deliveries.
Email contact@biofargo.com if you have any requirements.
