MXT Metal GC Columns

MXT Capillary Columns

The Perfect Fit

for Portable, Process, and High-Temperature GC Analysis

  • Eliminate GC column breakage at high temperatures; stable up to 450 °C.
  • Flexible metal tubing allows custom coil diameters down to 2.5 inches, giving a perfect fit for even the smallest spaces.
  • Exclusive Siltek treatment produces exceptional inertness and more accurate data.

Choose from these additional popular configurations or email Customer Service for a custom coiled column.

Siltek-treated stainless steel MXT wall coated open tubular (WCOT) columns are the best choice for high-temperature chromatography and other situations where the potential for column breakage is too high to rely on fused silica columns. For field instruments, process GCs, GCs with small ovens, etc., Restek MXT columns provide the strength of metal with the inertness of glass and are guaranteed to perform.

Fused silica columns are prone to breaking at high temperatures because the polyimide coating becomes brittle with extended exposure to heat (standard rating is 360 °C). In contrast, metal MXT tubing does not become brittle or break and can be used with confidence under more aggressive conditions (up to 450 °C, depending on the stationary phase). While metal surfaces can be a concern when analyzing active compounds, Restek MXT columns are Siltek treated, giving them an inertness similar to deactivated fused silica columns. The combined metal tubing and permeating Siltek treatment allow MXT columns to be coiled into extremely small diameters that are ideal for tight spaces, such as process GCs and field instruments. The standard coil diameter for most MXT columns is 4.5", but they can be custom coiled to meet your exact specifications (2.5–7" coil diameters). In addition, we also offer PLOT columns with MXT tubing.

Rugged and inert, Restek’s MXT columns are available with a wide variety of polymer phases making them suitable for a broad range of applications. For example, MXT-1HT SimDist columns and MXT-Biodiesel TG columns are widely used in the petroleum/petrochemical industry based on their reliable performance with numerous ASTM methods. Based on their ruggedness and demonstrated performance, MXT columns were also chosen as analytical columns to be carried on the Rosetta spacecraft’s Philae lander, which made history for achieving the first soft landing on a comet. In fact, a Restek MXT-1701 column was the first column ever flown in space. Learn more about space chromatography in our exclusive interview with Dr. Robert Sternberg.

Whether your analysis is being done in the field, the refinery, or the farthest reaches of the solar system, our metal MXT capillary columns are the best choice for high-quality, reproducible data. Explore our products and resources and put the power of Restek MXT capillary columns to work for you!

Here’s what Robert Sternberg, who was responsible for the space GC team at Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA) of the University of Paris XII, said about the MXT columns used in the Rosetta mission.

“I would like to mention that all the columns selected for space mission…have all been submitted successfully to space qualification tests such as vibration, radiation and thermal cycles1, which demonstrated their robustness for space application.

Since the beginning, the Restek company has been more than a manufacturer providing LISA with columns. Indeed, it has been strongly collaborating and helping LISA to develop custom-made columns able to meet the requirements of such an unusual scientific goal for chromatographic columns. That is why LISA is very grateful to Restek for being this ideal partner without the help of which the study and development of chromatographic columns for space use could not have been possible.”

[1] C. Szopa, U.J. Meierhenrich, D. Coscia, L. Janin, F. Goesmann, R. Sternberg, J.-F. Brun, G. Israel, M. Cabane, R. Roll, F. Raulin, W. Thiemann, C. Vidal-Madjar, H. Rosenbauer, Gas chromatography for in situ analysis of a cometary nucleus IV. Study of capillary column robustness for space application, J. Chromatogr. A, 982 (2002) 303-312.

MXT-1 Columns (Siltek-treated stainless steel)

nonpolar phase; Crossbond dimethyl polysiloxane

  • General-purpose columns for solvent impurities, PCB congeners (e.g., Aroclor mixes), gases, natural gas odorants, sulfur compounds, essential oils, hydrocarbons, semivolatiles, pesticides, and oxygenates.
  • Equivalent to USP G1, G2, G38 phases.
  • 4.5" standard coil diameter.

MXT-5 Columns (Siltek-treated stainless steel)

low-polarity phase; Crossbond diphenyl dimethyl polysiloxane

  • General-purpose columns for drugs, solvent impurities, pesticides, hydrocarbons, PCB congeners (e.g., Aroclor mixes), essential oils, and semivolatiles.
  • Equivalent to USP G27, G36 phases.
  • 4.5" standard coil diameter.

MXT-50 Columns (Siltek-treated stainless steel)

midpolarity phase; Crossbond phenyl methyl polysiloxane

  • General-purpose columns for pesticides, herbicides, rosin acids, phthalate esters, and sterols.
  • Temperature range: 0 °C to 300 °C.
  • Equivalent to USP G3 phase.
  • 4.5" standard coil diameter.

MXT-1301 Columns (Siltek-treated stainless steel)

low- to midpolarity phase

  • General-purpose columns for residual solvents, alcohols, oxygenates, and volatile organic compounds.
  • Temperature range: -20 °C to 280 °C.
  • Equivalent to USP G43 phase.
  • 4.5" standard coil diameter.

MXT-1701 Columns (Siltek-treated stainless steel)

midpolarity Crossbond phase

  • General-purpose columns for alcohols, oxygenates, PCB congeners (e.g., Aroclor mixes), and pesticides.
  • Equivalent to USP G46 phase.
  • 4.5" standard coil diameter.

MXT-200 Columns (Siltek-treated stainless steel)

midpolarity phase; Crossbond trifluoropropylmethyl polysiloxane

  • General-purpose columns for solvents, Freon fluorocarbons, alcohols, ketones, silanes, and glycols. Excellent confirmation column with an Rtx-5 column, for phenols, nitrosamines, organochlorine pesticides, chlorinated hydrocarbons, and chlorophenoxy herbicides.
  • Equivalent to USP G6 phase.
  • 4.5" standard coil diameter.

MXT-WAX Columns (Siltek-treated stainless steel)

polar phase; Crossbond Carbowax polyethylene glycol—provides oxidation resistance

  • General-purpose columns for FAMEs, flavor compounds, essential oils, amines, solvents, xylene isomers, and U.S. EPA Method 603 (acrolein/acrylonitrile).
  • Equivalent to USP G14, G15, G16, G20, and G39 phases.
  • 4.5" standard coil diameter.

MXT-1HT SimDist Column (Siltek-treated stainless steel)

nonpolar phase

  • Lowest bleed for longest column lifetime.
  • Reliably meets all ASTM D2887, D6352, D7169, D7213, and D7500 specifications.
  • 100% dimethyl polysiloxane phase allows easy comparisons to historical data.
  • Individually tested for guaranteed performance.
  • 7" coil diameter.
  • Temperature range: -60 to 450 °C.*
*Maximum temperature varies by cat.#; see column-specific temperatures.

MXT-2887 Column (Siltek-treated stainless steel)

nonpolar phase; Crossbond 100% dimethyl polysiloxane—for simulated distillation

  • Application-specific columns for simulated distillation.
  • Stable to 400 °C.
  • 4.5" standard coil diameter.

MXT-Biodiesel TG Columns (Siltek-treated stainless steel)

  • Fast analysis times and sharp mono-, di-, and triglyceride peaks.
  • Stable at 430 °C for reliable, consistent performance.

MXT-502.2 Columns (Siltek-treated stainless steel)

proprietary Crossbond diphenyl/dimethyl polysiloxane phase

  • Application-specific columns with unique selectivity for volatile organic pollutants, cited in U.S. EPA Method 502.2 and in many gasoline range organics (GRO) methods for monitoring underground storage tanks. Excellent separation of trihalomethanes; ideal polarity for light hydrocarbons and aromatics.
  • Temperature range: -20 °C to 320 °C.
  • 4.5" standard coil diameter.

MXT-Volatiles Columns (Siltek-treated stainless steel)

proprietary Crossbond diphenyl/dimethyl polysiloxane phase

  • Application-specific columns for volatile organic pollutants.
  • Temperature range: -20 °C to 320 °C.
  • 4.5" standard coil diameter.

MXT-624 Columns (Siltek-treated stainless steel)

low- to midpolarity phase

  • Application-specific columns for volatile organic pollutants. Recommended in U.S. EPA methods for volatile organic pollutants.
  • Temperature range: -20 °C to 280 °C.
  • Equivalent to USP G43 phase.
  • 4.5" standard coil diameter.

MXT-65TG Columns (Siltek-treated stainless steel)

high-polarity phase; Crossbond diphenyl dimethyl polysiloxane

  • Application-specific columns, specially tested for triglycerides.
  • Maximum temperature: 370 °C.
  • 4.5" standard coil diameter.

Intermediate-Polarity Deactivated MXT Guard/Retention Gap Columns/Transfer Lines (passivated stainless steel)

  • Useful for a wide range of applications.
  • Compatible with most common solvents.
  • Maximum temperature: 325 °C.

Hydroguard-Treated MXT Guard/Retention Gap Columns/Transfer Lines (passivated stainless steel)

  • Extend analytical column lifetime by preventing degradation from harsh "steam-cleaning" water injections.
  • Maximum temperature: 325 °C.


posted Mon, Nov 17, 2014
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Comet 67P/Churyumov-Gerasimenko: Data from Rosina.
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posted Tue, Feb 28, 2012
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posted Sat, Oct 01, 2011
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posted Fri, Jul 31, 2015
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Petroleum & Petrochemical

High Temp. Stability Problem Solved with New Metal Columns - Analysis of Total Glycerides in Biodiesel Oils by ASTM D-6584 Using New MXT-Biodiesel TG Capillary Columns

The high temperatures required for biodiesel analysis by gas chromatography present a considerable challenge to analytical columns. Fused silica columns, even those rated for high-temperature tolerance, breakdown relatively quickly. Restek’s new MXT-Biodiesel columns are more stable up to 430°C and offer excellent chromatography for glycerides. These columns are available in two configurations: factory-coupled to a 0.53mm retention gap, or with a built-in, leak-proof Integra-Gap retention gap.

Petroleum & Petrochemical

Eliminate Column Breakage in High Temperature Biodiesel Analysis

Using metal columns to analyze glycerides in biodiesel offer significant performance advantages compared to fused silica columns, as shown in this evaluation.

PDF Document

Biodiesel Solutions: Innovative Products for Simple, Reliable Biodiesel Analysis

This flyer includes data demonstrating the performance of recommended GC columns for the analysis of total glycerin, fatty acid methyl esters (FAMEs), and residual methanol in biodiesel. Features a comparison of metal and fused silica columns. (PDF - 0MB)

PDF Document

MXT Capillary Columns

Stainless steel MXT columns are your best choice for high temperature chromatography or any other situation where the potential for column breakage is too high to rely on fused silica. For field instruments, process GCs, GCs with small ovens, and more, reach for robust Restek MXT columns! (PDF - 0MB)

PDF Document

Get Guaranteed Method Performance With MXT-1HT SimDist Columns

Increase lab productivity and confidence in your data. Featuring rugged Siltek-treated MXT tubing to eliminate breakage, all 5 m x 0.53 mm x 0.10 μm MXT-1HT SimDist columns from Restek (cat.# 70112) are tested up to 430 °C. Performance is guaranteed to meet ASTM Method D6352-12, D7169-11, and D7500-12 requirements. (PDF - 0MB)

PDF Document

Analyzing Oxygenates in Gasoline Using TCEP and Rtx-1/MXT-1 Columns

Two methods are used to quantify individual alcohols and ethers in gasoline: a single column OFID method (e.g., ASTM Method D5599-94) and dual-column ASTM Method D4815-93. Restek offers columns, calibration mixtures, and inert capillary tubing for both approaches. 4-page note. (PDF - 0MB)

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