Author Archive

More Technical Service “Red Flags” – GC

Just like in my original post, Technical Service “Red Flags” – GC, this post contains several additional Red Flags we look (email) and listen (phone) for in technical service. Trying to set the carrier gas flow rate for a packed column without using a flow meter. You may want to review this previous post. Verify your […]

Technical Service “Red Flags” – GC

For those of you not familiar with the term “red flag”, or phrase “It raised a red flag”, it basically means that something does not sound correct, or is very unusual or uncommon. In tech service, we listen for these “red flags” and if we hear one, we will either offer a cautionary statement if […]

How to make sure your new GC capillary column will fit into your GC oven

I recently spoke to a customer who said she was having a difficult time finding the catalog number of the column she was trying to order. I asked for the catalog number, and she provided 70112-6850. I instantly knew what the problem was, she paired a MXT column catalog number (70112) with a fused-silica column […]

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 […]