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People Rely on You for Fast, Accurate Data. Rely on Restek's Inert and Low-Bleed Rxi GC Columns to Deliver It.
We get it. Your instrument needs to run. It needs to run now. And it is not enough to simply go fast—you need to get the right results the first time and save money in the process. In short, your GC column must produce the data you need, when you need it.
Restek developed the Rxi family of inert and low-bleed fused silica GC columns to help you solve the challenges you face in your lab on a daily basis. Take advantage of Restek Pure Chromatography to get your work done right and get it done quickly.
Rxi GC Columns: Built for Your Continued Success
Restek has complete control of our Rxi column production stream to allow us to offer an unbeatable Pure Satisfaction guarantee. You will receive a top-quality product that performs the way we promised it would, every time.
Why Should You Switch to Rxi GC Columns?
Rxi GC columns are built to be the best. But what does "best" mean? For the overworked analyst with an ever-shrinking budget, the best GC column is the one that lasts the longest while also providing:
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ACCURATE DATA
- THE RIGHT RESULTS FAST
- MAXIMIZED INSTRUMENT UPTIME
Put Rxi GC Columns to Work in Your Lab Today
You owe it to yourself, your data, and your customers to put the best GC column into your instrument. Read on about why Restek Pure Chromatography and inert and low-bleed Rxi GC columns are the right choice for improving the speed and accuracy of your results, and order yours today.


The Best GC Column for Your Next Method is an Rxi Column
Choosing the right stationary phase can make all the difference for the success of your analysis. We have developed a wide selection of stationary phases that span the polarity range, so you can easily select a perfectly matched Rxi GC column that helps you run faster and produce unbeatable results.

![]() Rxi-1ms Columns (fused silica)nonpolar phase; Crossbond dimethyl polysiloxane
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![]() Rxi-5ms Columns (fused silica)low-polarity phase; Crossbond diphenyl dimethyl polysiloxane
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![]() Rxi-XLB Columns (fused silica)low-polarity proprietary phase
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![]() Rxi-5Sil MS Columns (fused silica)low-polarity phase; Crossbond 1,4-bis(dimethylsiloxy)phenylene dimethyl polysiloxane
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![]() Rxi-35Sil MS Columns (fused silica)midpolarity Crossbond phase
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![]() Rxi-17 Columns (fused silica)midpolarity phase; Crossbond diphenyl dimethyl polysiloxane
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![]() Rxi-17Sil MS Columns (fused silica)midpolarity Crossbond phase
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![]() Rxi-PAH Columns (fused silica)midpolarity proprietary phase
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![]() Rxi-1301Sil MS Columns (fused silica)midpolarity Crossbond phase
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![]() Rxi-624Sil MS Columns (fused silica)midpolarity Crossbond phase
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![]() Rxi-1HT Columns (fused silica)nonpolar phase; dimethyl polysiloxane
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![]() Rxi-5HT Columns (fused silica)low-polarity phase; diphenyl dimethyl polysiloxane
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![]() Rxi-1ms Secondary Columns for GCxGC (fused silica)nonpolar phase; Crossbond dimethyl polysiloxane
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![]() Rxi-XLB Secondary Columns for GCxGC (fused silica)low polarity proprietary phase
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![]() Rxi-5Sil MS Secondary Columns for GCxGC (fused silica)low-polarity phase; Crossbond 1,4-bis(dimethylsiloxy)phenylene dimethyl polysiloxane
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![]() Rxi-17Sil MS Secondary Columns for GCxGC (fused silica)midpolarity Crossbond phase
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![]() GCxGC Selectivity Kit, 0.15 mm
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![]() GCxGC Selectivity Kit, 0.18 mm
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![]() GCxGC Selectivity Kit, 0.25 mm
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![]() Rxi Guard/Retention Gap Columns (fused silica)
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ChromaBLOGraphy |
posted Wed, Jan 14, 2015 CBDV and THCV on the Rxi-35Sil MS GC Column with Other Cannabinoids |
posted Thu, Oct 23, 2014 Benzo[b]fluoranthene as part of the EFSA PAH4 |
posted Tue, Nov 18, 2014 Residual Solvents in Cannabis…and Terpenes with Simon & Garfunkel |
posted Thu, Jul 17, 2014 Multi/Multi Methods (MMM) in Food Analysis |
posted Thu, Jul 17, 2014 Fast Determination of PAH and PCB in one Run |
posted Mon, Feb 24, 2014 Who Says There’s Nothing New Happening in GC Forensics? |
posted Mon, Jul 08, 2013 VOCs via Static Headspace/GC/MS is not old hat – new DIN 38407-43 |
Literature![]() Rxi Column Cross-Reference Table - Lower Detection Limits with Ground-Breaking Column TechnologyOur Column Cross-Reference Table makes it easy to choose the right Rxi column. |
![]() Rapid Analysis of Steroid Hormones by GC/MS - Using the New Rxi-1ms ColumnGC/MS analysis of urinary steroid hormones is a demanding application, and the Rxi-1ms column meets the requirements for low bleed and inertness better than any column we have tested. We analyzed a variety of derivatized steroid sex hormones in less than 25 minutes, with excellent resolution and symmetric peaks. At 300°C or above, bleed from the Rxi-1ms column was negligible. |
![]() Totally Reliable Column-to-Column PerformanceRxi columns demonstrate outstanding column-to-column reproducibility. |
![]() Ultra-Low Bleed Columns Improve Trace-Level AnalysisLearn how column bleed affects chromatography and why using Rxi columns can improve your data. |
![]() Superior Inertness Ensures Accurate Trace-Level AnalysisLearn why inertness matters and how using Rxi columns can improve your results. |
![]() Rxi-5Sil MS Columns: Assured Performance for Forensic ApplicationsRxi-5Sil MS columns produce excellent results for a number of forensic applications. The versatile selectivity separates a wide variety of compounds, which lets you keep analyzing samples instead of changing columns between methods. (PDF - 0MB) |
![]() Optimized Volatiles Analysis Ensures Fast VOC SeparationsAnalytical conditions for GC analysis of volatile organic compounds have been optimized to ensure good resolution of critical pairs, while maximizing sample throughput. Rxi-624Sil MS columns are shown to outperform other 624s. (PDF - 0MB) |
![]() Rxi-624Sil MS Columns—Exceptionally Inert, Low Bleed Columns for Volatiles AnalysisAnalyze volatile compounds and polar analytes with greater confidence using Rxi-624Sil MS columns. Optimized selectivity, higher inertness, and lower bleed result in reliable separations and accurate, trace-level determinations. Includes environmental and pharmaceutical applications. (PDF - 0MB) |
![]() New Rxi-PAH GC Column; Resolve Important Isobaric Polycyclic Aromatic Hydrocarbons for Food Safety and Environmental MethodsSeparate isobaric polycyclic aromatic hydrocarbons, including priority EFSA PAH4 compounds benz[a]anthracene, chrysene, benzo[b]fluoranthene, and benzo[a]pyrene, easily and accurately on an Rxi-PAH column. Whether you need more resolution or faster analysis, these new GC columns offer the selectivity and efficiency you need for food safety and environmental PAH analysis. (PDF - 0MB) |
![]() Combined Determination of 1,4-Dioxane and Nitrosamine Contaminants in Drinking Water Using SPE and CSR-LVSI GC-MSTypically, 1,4-dioxane and nitrosamines are analyzed in drinking water following separate extraction and analysis procedures, such as Methods 521 and 522. However, here we present a combined method that uses large volume splitless injection and GC-MS (SIM) to meet low part-per-trillion detection limits for these compounds in a fraction of the time required when running separate methods. (PDF - 0MB) |
![]() NEW! Rx-1301Sil MS GC ColumnsThe new Rxi-1301Sil MS column is ideal for the analysis of multiple compound classes across a range of polarities and volatilities. With its cyano-based selectivity and high thermal stability, it is the best 1301-type column for robust MS analyses. (PDF - 0MB) |
![]() Rxi GC Columns BrochureRestek developed the Rxi family of fused silica GC columns to help you solve the challenges you face in your lab on a daily basis. Let us worry about column inertness and lifetime, stability and reproducibility, bleed and peak shape. Take advantage of Restek Pure Chromatography to get your work done right and get it done quickly. (PDF - 0MB) |
![]() Rxi GC Columns Sales SheetLeverage the outstanding inertness, low bleed, and high reproducibility of Rxi 3-in-1 technology to gain accurate data, the right results fast, and maximized instrument uptime. (PDF - 2MB) |
![]() Rugged, Low-Bleed Performance for Challenging GC-MS WorkAcross all industries, chromatographic testing methods are becoming more stringent, limits of detection are dropping, and deadlines are getting tighter. While GC-MS and GC-MS/MS instrumentation can improve detectability, column bleed can limit the potential of these powerful techniques. Restek’s Rxi-5Sil MS columns are rugged enough to withstand high temperatures and harsh conditions, and still provide the low bleed levels needed for accurate, reliable MS performance. (PDF - 0MB) |
![]() GC Capillary Columns 101 InfographicPhase polarity, film thickness, inner diameter, length—the choices you make for common GC capillary column specifications can affect your chromatography in so many ways, both good and bad. Join Restek on a quick tour through each of these factors for a fun and engaging overview of the variables that come into play when you select a GC capillary column. Whether you need a quick reminder of the fundamentals or your first taste of column chemistry, this infographic is a great place to start. (PDF - 0MB) |
![]() Accurately Quantify PAHs Down to 5 pg On-Column: GC/MS SIM Analysis with the New Rxi-5Sil MS ColumnPolycyclic aromatic hydrocarbons (PAHs) are common environmental pollutants, affecting air, water, and soil quality. Although naturally occurring, human impact has created a steady increase in environmental levels of PAHs and their byproducts. PAHs are typically formed through the incomplete combustion of organic materials, such as wood, coal, and oil, but are also used in manufacturing of some medicines, plastics, and pesticides. Many PAHs are known or suspected carcinogens. The United States Environmental Protection Agency currently lists and mandates testing of the 16 PAHs they deem most hazardous. (PDF - 1MB) |
![]() Rxi-5Sil MS: Exceptionally Inert Columns for GC/MS and Trace-Level AnalysesRxi-5Sil MS columns show lower bleed profiles and greater inertness than competitor columns, resulting in higher signal-to-noise ratios and lower detection limits. These silarylene GC columns are ideal for trace-level gas chromatography work and sensitive GC/MS applications. (PDF - 1MB) |
![]() Rxi-5Sil MS Capillary GC ColumnsSemivolatiles methods, such as EPA Method 8270, place stringent demands on gas chromatography (GC) columns. Here we demonstrate the performance of Rxi-5Sil MS columns for semivolatiles analysis in terms of bleed, efficiency, and activity. Excellent sensitivity and resolution are seen, even for difficult PAHs such as benzo(b)fluoranthene & benzo(k)fluoranthene, and indeno(1,2,3-cd)pyrene and dibenzo(a,h)anthracene. Both basic and acidic compounds show good response even at low levels. (PDF - 4MB) |
GC Chromatograms
![]() Sulfur Compounds on Rxi-1msGC_AR00861 |
![]() Steroid Sex Hormones on Rxi-1msGC_PH00872 |
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![]() Unleaded Gasoline on Rxi-1msGC_PC01071 |
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![]() Mineral Oil & Motor Oil on Rxi-5HTGC_PC1163 |
![]() PAHs and PCB Congeners on Rxi-XLBGC_EV1223 |
![]() EU PCB Congeners on Rxi-XLBGC_EV1240 |
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![]() NIST SRM 2260a PAH Mix on Rxi-PAHGC_FF1223 |
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