Our Services
Liner Regeneration, Surface Treatment of Glass and PU Foams
Liner Regeneration
Turn old into new!
What do you do with used liners at the end of their service life? New liners are very expensive, especially with more unusual geometries for special applications; the regular purchase of new liners can be a considerable cost factor. This is why CS-Chromatographie Service GmbH offers the regeneration of used liners. This saves costs and avoids unnecessary waste.
For regeneration, the used liners are first thoroughly cleaned, then deactivated and finally conditioned so that they are immediately ready for use again. If glass wool is introduced into the liner, this is done before deactivation to prevent the formation of active surfaces. Liners can be regenerated many times this way without any loss of performance, which results in considerable cost savings. Special requests, such as the insertion of glass wool at different positions in the liner and the insertion of packing materials, are also possible according to customer requirements.
The customer’s requirements are fully considered when deactivating the liners. This is why CS offers a selection of different deactivation processes. In addition to the tried and tested Sil deactivation, which corresponds to the standard deactivation of new liners, the high-quality INNO-Sil process and PM-Sil deactivation, which is particularly suitable for polar analytes, are also available.



LINER REGENERATION

Surface Treatment of Glass
It’s the surface that counts!
Glass is an active material, to the surface of which a variety of analytes can bind. This can have a negative effect on analytical results, ranging from falsification of the sample composition to complete adsorption of sample components. The silanization of GC liners has long been essential to minimize this problem in the injector. However, it is often neglected during sample preparation and storage. This effect often leads to falsified analysis results, especially in the trace analysis of pesticides and sensitive substance classes such as amines, phenols, steroids, proteins and others. The deactivation of the glass surface can provide significantly improved results here.
CS-Chromatographie Service GmbH offers a range of deactivation methods, each of which is optimized for specific applications. For example, standard, non-polar Sil deactivation is sufficient in most cases to prevent the interaction of analytes with silanol groups on the glass surface. Depending on the analyte, however, medium-polarity phenyl-methyl (PM) silanization may also be more suitable. For particularly high demands, for example in pesticide analysis, high-quality INNO-Sil deactivation is available, which ensures maximum inertness of the glass surface.
In the pharmaceutical industry, siliconization is a long-established process for creating a durable inert protective layer for glass surfaces.
CS also offers HCl treatment of glass surfaces to remove metal ions and basic impurities to which some analytes could bind, e.g. through complexation, or which could contaminate the sample.
In principle, all glass surfaces can be treated with the surface treatment processes mentioned. In addition to glass bottles, GC liners and glass wool, CS offers the treatment of almost any other glass parts; other deactivations are also possible. We would be happy to advise you on this and provide you with a customized offer.
Surface Treatment of Glass
HCl Treatment

Silanization

Siliconization


Gas Sampling
The maintenance, servicing, and also the dismantling of old buildings and facilities constructed with halogenated pollutants such as PCBs (e.g. in silicone sealants), but also accidents in which PCDDs, PCDFs, or other pollutants were released, today require constant monitoring of the concentrations of these hazardous substances in indoor and ambient air. Suitable sample preparation is required for the isolation and enrichment of these substances, which are usually only present in trace amounts. For many years, reversible adsorption of these pollutants on specially cleaned PU foam filters (PUFs) has been established for this purpose. This procedure is also specified in various US EPA, ASTM, and DIN methods.
CS-Chromatographie Service GmbH produces suitable PU foam filters in numerous sizes from 8 x 31 mm to 100 x 135 mm from the two common PU materials SH 100 and GA 3035. The filters are offered both uncleaned and cleaned according to VDI method BGI 505.47 (formerly ZH 1/120.47). In this process, the PU foam filters are extracted with toluene for 24 hours and then with acetone for 24 hours, so that production-related impurities are removed and blank values are reduced accordingly. Other dimensions and cleaning methods are also available on request. By purchasing the cleaned filters, which are supplied in flat bags made of aluminum composite foil or, for a small surcharge, in amber glass screw-top containers with a PTFE-coated sealing washer, depending on the customer’s requirements, the user is spared the cumbersome and time-consuming preparation and can concentrate fully on the actual measurement.
As an alternative to PU foam filters, glass tubes filled with Florisil are also suitable, which are recommended by the PCB guideline NRW and the VDI standard 2462, sheet 1, among others, as a suitable means of sampling indoor air. CS produces these glass tubes and offers them in the usual high quality.

