Author Archive

Maximum temperatures of packed columns – Sulfur Gases

For my fifth and final post in this series, I would like to focus on packed columns for light sulfur gases.  Compounds include (but not limited to) hydrogen sulfide, sulfur hexafluoride, carbonyl sulfide, sulfur dioxide, methyl mercaptan, ethyl mercaptan, etc. Because some analysts prefer PTFE tubing and/or PTFE frits for their columns, the maximum temperature […]

Maximum temperatures of packed columns – Molecular Sieves

For my forth post in this series, I would like to focus on molecular sieve packed columns.   At Restek, our three most common molecular sieve packings are the ShinCarbon, 5A, and 13X.  The ShinCarbon is a carbon molecular sieve, while the 5A and 13X are zeolite molecular sieves.  To read more about these packings/columns, please […]

Maximum temperatures of packed columns – Hydrocarbon Analysis

For my third post in this series, I would like to focus on specialty packed columns for hydrocarbon analysis.  In some cases, the packings in these columns are proprietary, so detailed information cannot be provided.  In other cases, application information may be limited.  However, we can provide maximum temperature limits (see table below). For other […]

Maximum temperatures of packed columns – Liquid Phases

For my second post in this series, I would like to focus on liquid phases.  As you know, for packed columns, a liquid phase needs a solid support.  Combined, these are what makes the “packing”.  In most cases, it is the liquid phase which limits the packed column’s maximum temperature, and not the solid support. […]

Maximum temperatures of packed columns – Porous Polymers

We often get asked about the maximum temperature limit of our packed columns, so I decided to write a post series which will provide this information for the majority of the packed columns which we sell.  I thought I would start with the least complicated packed columns, those whose packings are typically not coated with a […]

Packed Column information for the beginner

We seem to be getting more calls from first time users of packed columns, so I decided to write this post for these beginners to help them understand the terminology commonly used when describing these products.   What is a packed column? Unlike GC capillary columns, which are referred to as WCOT (Wall Coated Open […]

Tube-End Reducers : End Sizes Clarified

I have talked to a few customers this week who were having some trouble identifying the sizes of the ends for our Swagelok® and Parker® Tube-End Reducers, so I thought I would write a post to clarify this information. A general photo of the style of a Tube-End Reducer which we sell is shown below.  The […]

GC columns – when one is not enough

Often we get asked for a column recommendation for a complex GC analysis.   This is especially true for gas analysis.  Probably the most common request is for separation of fixed (permanent) gases (like O2, N2, CO, CO2, N2O, etc…) plus separation of larger (higher-boiling point) compounds (light hydrocarbons, moisture, sulfur compounds, etc.).  Unfortunately, there is […]

Swagelok® and Parker® Tube Fitting Manuals

When asked by customers for what I consider the best reference guides on Swagelok® and Parker® fittings, I send them the following links.  I thought our blog readers may also benefit from these links, so here they are (below).  I hope you find them useful. Swagelok® Tube Fitter’s Manual Parker® Instrument Tube Fitting Installation Manual […]

Are your ghost peaks coming from the GC column, or something else?

  This is a common GC troubleshooting question.  Since determining the source of the ghost (contamination) peaks can be difficult, I decided to write this post to (hopefully) help our customers. . GC column carryover When I operated an instrument on a daily basis, it was only a matter of time before something caused ghost peaks […]