18mm Screw Caps with Septa (18-400)
18mm Screw Cap with Septa, 18-400
1) Basic Information
| Product Name | 18mm Screw Cap with Septa, 18-400 |
| Cap Material | PP |
| Cap Thread | 18-400 |
| Cap Color | Black/White/Red/Yellow |
| Septa | PTFE/Silicone |
| Septa thickness | 1.5mm |
| Application | For LC/GC |
| Packaging | 100 pcs Packed in one Bag |
2） Product Overview
These Caps&Septas are custom-made for 10/15 mL 18-400 sampler vials, fitted with integrated PTFE/silicone septa. Perfect for high-precision lab analytical testing.
Constructed from premium raw materials, these caps feature outstanding chemical inertness and superior sealing performance. They effectively stop sample contamination and analyte volatilization to guarantee accurate test results.
Widely applicable to HPLC, GC and other chromatographic analysis, they fully satisfy strict lab standards for sample handling. Simple to use and highly compatible with mainstream equipment, they deliver reliable performance for scientific research and quality control.
3） Key Features
- Professional quality control team stabilizes batch production consistency
- Certificate of Analysis (CoA) supplied with every shipment
- Standard open-top design for HPLC samplers; compatible with Shimadzu, Varian, Gilson and more instruments
- Individual test certificates included for all cap orders to verify full specification compliance
- Standard threaded PP caps engineered for 10/15 mL sampler vials
- Pre-assembled cap & septum units lower contamination risks during sample preparation
- Sealed PE bag packaging keeps caps clean and free of impurities before use
- Custom OEM labeling service supported
4) Applications
HPLC & GC Autosampler Analysis
Open-top caps are designed for high-throughput automatic sample testing. The structure allows autosampler needles to pierce the septum directly for sample extraction without manual cap removal, greatly boosting testing efficiency and data accuracy.
For labs running high-volume sample batches, matching open-top caps with autosamplers dramatically improves sample processing speed and testing repeatability, while minimizing human operational errors.
5）Ordering Information
| P/N | Description | Pack Of | Image |
| P02074 | 18mm Black Screw Polypropylene Cap, 9mm Centre Hole + Nature PTFE/nature Silicone Septa | 100 |  |
| P02075 | 18mm Black Screw Polypropylene Cap, Without Hole+ Nature PTFE/nature Silicone Septa | 100 |  |
| P02076 | 18mm White Screw Polypropylene Cap, Without Hole + Nature PTFE/nature Silicone Septa | 100 |  |
| P02077 | 18mm Black Screw Polypropylene Cap, Without Hole + PE Septa | 100 |  |
| P02078 | 18mm White Screw Polypropylene Cap, Without Hole + PE Septa | 100 |  |
| P02079 | 18mm Red Screw Polypropylene Cap, Without Hole + PE Septa | 100 |  |
| P02080 | 18mm Yellow Screw Polypropylene Cap, Without Hole + PE Septa | 100 |  |