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Volatiles & PEG Phases: Look Out for that Spooky Glass Transition Temperature.

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  • Chris English
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Of Restek’s seven variations of PEG phases the top sellers are the Stabilwax & Rtx-Wax columns. While the Stabilwax phase has the advantage of low bleed and stability; the ability of the Rtx-Wax to operate at below 40°C is especially advantageous for the analysis of low molecular weight volatiles. This is true for concentration techniques involving HS or P&T analytes which must be cold trapped onto the head of the column from the gas phase. Many PEG phases (including Stabilwax) undergo a solid-liquid phase transition T(g) below 40°C that results in loss of capacity and poor retention time reproducibility. Unfortunately the example shown here is my personal mis-use of the Stabilwax Phase–so unless you want to add to my blog choose the right PEG for your specific analysis and don’t hesitate to ask us for help.

Stabilwax Columns: http://www.restek.com/catalog/view/1414

Rtx-Wax Columns: http://www.restek.com/catalog/view/1432