Vespel® Ferrules for chromatography by Greyhound
Vespel® Ferrules - are made from 100% high-temperatureDuPont polyimide with precision drilled ID. Vespel is fairly hardand tends to seal permanently to the column.
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description
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Scope of application
features and quality
Greyhound Chromatography supplies the most extensive range of ferrules available from any single supplier, manufactured from Vespel, Vespel/Graphite, Graphite and PTFE. The ferrule size refers to the size of the compression fittng and the OD of the tubing to be used.
Vespel® Ferrules - are made from 100% high-temperature DuPont polyimide with precision drilled ID. Vespel is fairly hard and tends to seal permanently to the column.
Vespel® Ferrules - are made from 100% high-temperature DuPont polyimide with precision drilled ID. Vespel is fairly hard and tends to seal permanently to the column.
| Manufacturer | Greyhound |
|
Model |
GC Vespel® |
|
Material |
Vespel® |
| Max.Temp. | 350 °С |
- Isothermal operation
- Reliable seals even with surface imperfections, adjusts to sealing surface
- Excellent sealing material when making glass or metal connections
- Reliable seals even with surface imperfections, adjusts to sealing surface
- Excellent sealing material when making glass or metal connections
|
Ferrule Type |
Temp. Limit |
Advantages |
Disadvantages |
|
Graphite (100%) |
450°С |
- Easy to use, can be tightened to hold the column in place without seizing. Column can be readjusted if required - Easy removed from column and fiting - High temperature limit
- Most forgiving material to correct connection imperfections - Can be re-used |
- Allows air diffusion. Not suitable for MS or oxygen-sensitive detectors - Over tightening can extrude graphite into the inlet or detector. Pieces could flake off and remain in the fiting, which could cause peak tailing and sample losses - Can interact with the solvent and causing tailing |
|
Vespel/Graphite |
400°С |
- Simple and reliable connections - Reusable & can be retightened - Maintains shape and does not flake of - Reasonably forgiving of any connection imperfections |
- Design is specific to fiting size - Will shrink with temperature cycling. - Will shrink with temperature cycling. - Seizes on the column, cannot be re-adjusted, must be cut of |
|
Vespel |
350°С |
- Easy reliable connections - Reusable & can be retightened - Easily removed if used if used at room temperature - Low air permeability |
- Can shrink at elevated temperatures, must re-tighten frequently - Using above the recommended temperature limit can cause the material to melt and damage the fiting |
|
Teflon |
250°С |
- Easy connection - Can be re-used - Very forgiving of connection imperfections. - Can seal with very litle pressure |
- Not for MS or oxygen-sensitive detector
- Allows air diffusion. |
