• Superior thread design provides a more secure seal to the closure
• 40% larger neck opening versus standard opening screw top vials improve sample accessibility
• Uniformly flat bottom with insert for security
• Write-on patches with graduations at 0.5, 1.0, and 1.5 mL
• Pre-assembled cap and septa, convenient and direct use
• Compatible with most of HPLC / GC autosamplers
◆ Screw Cap with Septa for 2 mL Screw Thread Vials
• Cap manufactured from polypropylene
• Pre-assembled caps and septa are convenient and minimize contamination from handling
• Choice of liner
◆ Ordering Information
| Description | Quantity | Cat. No. |
| Screw cap, blue, open top, with PTFE / Red rubber septa | 100pk | 5324 |
| Screw cap, blue, open top, with PTFE / White silicone septa | 100pk | 5325 |
| Screw cap, blue, open top, with PTFE / Silicone / PTFE septa | 100pk | 5326 |
| Screw cap, black, open top, with Pre-slit PTFE / Silicone septa | 100pk | 5327 |
| Screw cap, blue, open top, with PTFE / ULB silicone septa | 100pk | 5328 |
| Screw cap, blue, open top, with Pre-slit PTFE / ULB silicone septa | 100pk | 5329 |
◆ Septum Selection Guide
| Septum Material | Specification | Temperature |
| PTFE / Red Rubber | The most popular and economical choice for general gas chromatography applications. These septa are used primarily for routine analysis in gas chromatography. They offer moderate resealing ability, but are not recommended for multiple injections or storage of samples | -40 - 110 ºC |
| PTFE / Silicone | Good for multiple injections or storage of samples due to its excellent resealing capabilities. The white silicone is soft and more easily punctured,and protects the needle in an autosampler accordingly | -60 - 200 ºC |
| PTFE / Silicone Slit | Same as above, with an additional slit in the center providing easier needle puncture, especially for large diameter and blunt tip needles. However, this will result in evaporation of volatile organic solvents, and is thus not recommended for storage of samples | -60 - 200ºC |
| PTFE / Silicone / PTFE | Recommended for the most critical applications such as ultra trace analysis or where there is a longer period between injections or for internal standardmethods | -60 - 200ºC |
| PTFE / ULB Silicone | Excellent chemical inertness and ultra-low bleed, the interference of a lowbaseline will make it much more suitable for highly sensitive detectors suchas MSDs | -60 - 200ºC |
| PTFE / ULB Silicone Slit | Same as above, with an additional slit in the center providing easier needle puncture, especially for large diameter and blunt tip needles. However, this will result in evaporation of volatile organic solvents, and is thus not recommended for storage of samples | -60 - 200ºC |
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