Yes, please visit the GC and GCMS page to select supplies specific for your GC, such as autosampler syringes, ferrules, liners, and septa.
We do not recommend cleaning inlet liners. All liners manufactured by Trajan are deactivated and certified for high performance. During cleaning the deactivation will be removed. Deactivating the cleaned liner in the laboratory will still result in the presence of active sites that can adsorb sample components and cause peak tailing, with potential loss of sensitivity and reproducibility.
Download the Liner Selection Tool to assist in finding the right inlet liner for your analysis.
The tool also includes a handy Vapor Volume Calculator that checks if you are injecting too much for a particular liner. It can help you avoid the ghost peaks, injector contamination, and quantitation errors associated with flashback.
GC ferrules are available in graphite, Vespel®, Vespel-graphite and PTFE. View the full range of CRS GC ferrules.
Graphite ferrules are porous to oxygen, therefore they are unsuitable for connecting columns to mass spectrometers.
The 400°C maximum is based on some oxygen being present. Above 400°C oxidation can start to occur. It can occur at lower temperatures if the ferrules are being used to seal a vacuum, as oxygen will be drawn in through the graphite. It may be possible to use them at 600°C without issues if oxygen has been excluded. Longer term there may still be some degradation.
These graphite ferrules are suitable for low pressure GC applications.
In-house testing has shown that it is possible to get SilTites to work with aluminium clad columns, but it is difficult to get them to work every time with a GCMS. If someone was not using MS, then if they are careful they should be able to get them to work.
Sometimes the aluminium layer can be a little rough, so it would be a good idea to avoid any sections of the column that feel rough. Since the SilTite material is relatively hard, when it is compressed down on to a rough area of the aluminium, it is more likely to cause a fracture.
SilTite nuts and ferrules are only available for the MS interface.
The Agilent MS SilTite kit can be used. The ferrule fits with the point into the nut.
No. SilTite ferrules can only be used with specific SilTite nuts which are characterized by two notches on the outside of the nut. The reason for this is that the angle in the tapered end of the nut is specifically designed to cause the tapered end of the ferrule to seal on the capillary column as the nut is tightened the required 60°. Swagelock type nuts don't have the correct angle on the taper to seal the ferrule on to the capillary column.
The ferrule is a back ferrule, which means that the tapered end of the ferrule goes into the tapered recess of the nut. This leaves the flat face of the ferrule to be in contact with the flat face of the interface providing an airtight seal.
We have generally found that SilTite μ-unions do not work well with metal columns. This is due to two factors.
One reason is that the outside diameter of stainless steel capillary columns is generally different to fused silica column with the same inside diameter. SilTite μ-unions and ferrules rely on a very precise fit between the hole size and the outer diameter of the column. So when the outside diameter of the column is different, it is difficult to get a good seal.
The second reason is that the SilTite μ-unions and ferrules rely on the polyimide outer layer of fused silica columns being slightly soft, so that they can crimp (swage) slightly into this layer. Stainless steel capillary column tend to be too hard, and if they are not quit round or slightly rough, then the SilTite μ-unions and ferrules can not seal properly.
Yes, CRS Puresep T GC septa are faced with polyimide film, and have a double layer of polyimide and PTFE on one side. Puresep T septa are not low-bleed septa, and their recommended maximum temperature is 225°C. Puresep T septa are stamped from sheets of material to the size specified. All general purpose septa are produced to tight tolerances in dedicated molds. View our full range of CRS GC septa.
For other septa options for use with vials, including silicone with PTFE, view our septa, caps and liners range.
GC septa are 3 mm thick.
SEP0073 which were 3.2 mm thick, were replaced with SEP0089 which were the 4 mm thick. SEP0089 were then replaced with part number 0418999. 0418999 is made of a different material (same BTO silicone as our HT septa), and looks different, but has been tested and approved by Los Gatos Research to replace SEP0089. It isn’t pre-drilled, but does have a hole molded into to that goes part way through the septa. We don't list it on our website as it is thicker than the rest of our septa that are used in GCs, and would tend to cause problems if someone tried to use it in a GC.
Phthalates are seldom present in silicone parts. There are no phthalates added to the septa during the manufacturing process.
| CRS GC septa | Trajan GC septa |
|---|---|
| BTO (Bleed temperature optimized) | HT |
| AG3 (Advanced Green 3) | EC |
| Marathon | MN |
| GP (General purpose) | GP |
| Puresep T | - |
| Endura-Seal | - |
View the full range of CRS GC septa.
The jigs are set so the length of the 0.4 and 0.5 tubing are a different length. The hole in the SilFlow is longer for the 0.4 mm than the 0.5 mm to reduce dead volume.
Our recommendation would be to set the ferrules in the SilFlow instead of using the jigs. This is just in case the tubing OD’s are different to expected.
The 1.1 mm tube must be swaged in the SilFlow. A wrench (spanner) may be needed to tighten enough to be leak free (part number 18500002 Spanner 3/16" x 1/4" AF).
It is 0.65 mm ID.
When stainless steel and stainless steel (SilFlow and ferrule) are heated, there can be some minor sticking. To remove the ferrule easily push pin carefully around the outside of the ferrule to gradually release and remove it.
We recommend connecting to an HPLC pump and backflushing the SilFlow to remove any debris.
Yes, the SilFlow can be placed in an ultrasonic bath. The following solvents will not affect the deactivation:
There is no practical temperature limit. The limitation will be the maximum temperature of the GC column.
| CRS ZPure™ gas filter | Trajan Big Trap |
|---|---|
| HC 750 cc | Hydrocarbon |
| H20 750 cc | Moisture |
| O2/H2O 750 cc | Oxygen |
| PolyGas I 750 cc | Universal |
| Wide filter mounting kit (with hardware) | Mounting clip |
View the full range of CRS gas purifiers and filters.
Filters should be installed in a vertical position, so the gas stream travels through the entire adsorbent bed. Horizonal installation could create a void where the gas would travel and bypass the media by using the path of least resistance.
Match your fittings with your tubing. Stainless steel fittings are used with stainless steel tubing, and brass fittings are ideally used with copper tubing.
Many parameters go into choosing the correct filter and determining its life expectancy including the general application, the impurity and their levels, flow rates, pressure ratings, usage time, fitting requirements, etc. To get an accurate estimate of life expectancy before purchasing a filter, contact technical support. The specifications listed in product brochures are assuming quantities that would give about a one year life expectancy for each filter in general GC applications.
Ensure that the bag is not over inflated. Over inflation pushes the bag hard up against the walls of the canister, making it impossible to remove.
The GAV-200 sampling bags consist of three laminated layers; an inert polymer liner, an impervious aluminum layer to prevent diffusion of gases through the bag, and a tough polymer outer coating.
The sample bags are suitable for gas pressures differentials up to 5 psi.
Maximum temperature: 70°C
Minimum temperature: 5°C
The canister is polycarbonate and the cap is polypropylene.
The maximum pressure of the canister is 50 psi.
When sampling from a low pressure source a vacuum can be applied to the canister.
Maximum operating temperature: 70°C
Minimum operating temperature: 5°C
The internal volume of valve 1236091 in the open position is 12.57 μL.
Yes, this is part number 123681 VSV-6 Vespel valve seat pack of 5.
The old seal has to be levered off. The new seal then has to be carefully levered on using something like a screwdriver, make sure that whatever is used doesn't have any sharp edges, or burrs, that might cut or tear the seal.
It may be tempting to use some detergent as a lubricant, but there is the risk that if any residue remains it may cause the valve to stick at a later stage.
At temperatures above about 220/230°C It is believed that the hydrogen carrier gas will chemically reduce the BPX70 phase (the opposite of what normally happens when oxygen gets into a column). This can be seen as a collection of small peaks towards the end on the run (at high temperature). These can easily be mistaken for trace levels of some of the longer chain fatty acids. When using helium, the peaks are no longer seen. Therefore it is not recommend to use hydrogen as a carrier gas with BPX70 phases at high temperatures.
The CYDEX-B phase is 7% HEPTAKIS (2,3,6-TRI-O-METHYL) Beta CYCLODEXTRIN in a 14% Cyanopropylphenyl Polysiloxane.
5 meters.
No.
Each capillary column is factory conditioned and tested. It is recommended to give your column a short (30-60 minutes) conditioning before use. Further information can be found in the Capillary Column Installation Guide.
All columns displayed on the website are premium low-bleed columns with bonded phases. This means that one is able to wash the columns with solvent.
We do not supply FAME standards, but there are a number of companies that do.
Check the injection system first. If you are using split injection, ensure that your split flow is at least 20 mL/min. If you are using splitless injection, ensure your initial oven temperature is at or below the boiling point of the solvent.
The best general purpose column is the BPX5 column. It has a 5% phenyl phase and the most versatile size is 30 meters x 0.25 mm ID with a 0.25 μm film (part number 054101). This column has been designed for mass spec applications and is especially low bleed.
