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Inert and Low-Bleed Rxi GC Columns

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Leverage the outstanding inertness, low bleed, and high reproducibility of Rxi GC Columns with 3-in-1 technology to gain:

ACCURATE DATA
THE RIGHT RESULTS FAST
MAXIMIZED INSTRUMENT UPTIME

Quickly choose the right inert and low-bleed Rxi GC column and conditions with the EZGC method development suite.

Get Started!

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.

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Fused
Silica

Deactivation

Phase
Chemistry

Quality
Control

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:

ACCURATE DATA

Outstanding
Inertness

Low Bleed

High
Reproducibility
THE RIGHT RESULTS FAST
MAXIMIZED INSTRUMENT UPTIME

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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

General-purpose columns for arson accelerants, essential oils, hydrocarbons, pesticides, PCB congeners (e.g., Aroclor mixes), sulfur compounds, amines, solvent impurities, simulated distillation, oxygenates, gasoline range organics (GRO), refinery gases.
Tested and guaranteed for ultra-low bleed; improved signal-to-noise ratio for better sensitivity and mass spectral integrity.
Temperature range: -60 °C to 330/350 °C.
Equivalent to USP G1, G2, and G38 phases.

Rxi-5ms Columns (fused silica)

low-polarity phase; Crossbond diphenyl dimethyl polysiloxane

General-purpose columns for semivolatiles, phenols, amines, residual solvents, drugs of abuse, pesticides, PCB congeners (e.g., Aroclor mixes), solvent impurities.
Most inert column on the market.
Tested and guaranteed for ultra-low bleed; improved signal-to-noise ratio for better sensitivity and mass spectral integrity.
Temperature range: -60 °C to 330/350 °C.
Equivalent to USP G27 and G36 phases.

Rxi-XLB Columns (fused silica)

low-polarity proprietary phase

General-purpose columns exhibiting extremely low bleed. Ideal for many GC-MS applications, including pesticides, PCB congeners (e.g., Aroclor mixes), PAHs.
Unique selectivity.
Temperature range: 30 °C to 360 °C.

Rxi-5Sil MS Columns (fused silica)

low-polarity phase; Crossbond 1,4-bis(dimethylsiloxy)phenylene dimethyl polysiloxane

Engineered to be a low-bleed GC-MS column.
Excellent inertness for active compounds.
General-purpose columns—ideal for GC-MS analysis of semivolatiles, polycyclic aromatic compounds, chlorinated hydrocarbons, phthalates, phenols, amines, organochlorine pesticides, organophosphorus pesticides, drugs, solvent impurities, and hydrocarbons.
Temperature range: -60 °C to 350 °C.
Some dimensions also available as Integra-Guard columns — a guard and analytical column in one to eliminate connection problems!

Rxi-35Sil MS Columns (fused silica)

midpolarity Crossbond phase

Special selectivity and excellent inertness for substituted polar compounds, such as drugs, pesticides, herbicides, PCBs, phenols, etc.
Provides superior separation for cannabinoids.
Very low-bleed phase for GC-MS analysis.
Extended temperature range: 50 °C up to 360 °C.

Rxi-17 Columns (fused silica)

midpolarity phase; Crossbond diphenyl dimethyl polysiloxane

General-purpose columns for pesticides, herbicides, rosin acids, phthalate esters, triglycerides, sterols.
Temperature range: 40 °C to 320 °C.

Rxi-17Sil MS Columns (fused silica)

midpolarity Crossbond phase

Excellent inertness and selectivity for active environmental compounds, such as PAHs.
Low bleed for use with sensitive detectors, such as MS.
340/360 °C upper temperature limits.
Equivalent to USP phase G3.

Rxi-PAH Columns (fused silica)

midpolarity proprietary phase

Ideal for EFSA PAH4 analysis—separates all priority compounds: benz[a]anthracene, chrysene, benzo[b]fluoranthene, and benzo[a]pyrene.
Best resolution of chrysene from interfering PAHs, triphenylene, and cyclopenta[cd]pyrene.
Complete separation of benzo [b], [k], [ j], and [a] fluoranthenes.
360 °C thermal stability allows analysis of low-volatility dibenzo pyrenes.

Rxi-1301Sil MS Columns (fused silica)

midpolarity Crossbond phase

Highest thermal stability in the industry ensures dependable, accurate MS results and increased uptime.
Stabilized cyano phase selectivity improves the performance of existing methods. Ideal for solvents, glycols, and other polar compounds.
Rigorous QC testing ensures inertness and accurate, reliable data for multiple compound classes.
Maximum temperature: 320 °C.

Rxi-624Sil MS Columns (fused silica)

midpolarity Crossbond phase

Low-bleed, high-thermal stability column—maximum temperatures up to 300–320 °C.
Inert—excellent peak shape for a wide range of compounds.
Selective—G43 phase highly selective for volatile organics and residual solvents, great choice for USP<467>.
Manufactured for column-to-column reproducibility—well suited for validated methods.

Rxi-1HT Columns (fused silica)

nonpolar phase; dimethyl polysiloxane

Columns processed for high-temperature applications, such as high molecular weight hydrocarbons.
Temperature range: -60 to 400 °C.

Rxi-5HT Columns (fused silica)

low-polarity phase; diphenyl dimethyl polysiloxane

Columns processed for high-temperature applications, such as mineral oil.
Temperature range: -60 to 400 °C.

Rxi-1ms Secondary Columns for GCxGC (fused silica)

nonpolar phase; Crossbond dimethyl polysiloxane

Convenient 2 m length is ideal for use as a secondary column in GCxGC analyses.
General purpose columns.
Temperature range: -60 °C to 330/350 °C (bleed tested temperature/maximum operating temperature).

Rxi-XLB Secondary Columns for GCxGC (fused silica)

low polarity proprietary phase

Convenient 2 m length is ideal for use as a secondary column in GCxGC analyses.
General purpose columns exhibiting extremely low bleed.
Unique selectivity.
Temperature range: 30 °C to 360 °C.

Rxi-5Sil MS Secondary Columns for GCxGC (fused silica)

low-polarity phase; Crossbond 1,4-bis(dimethylsiloxy)phenylene dimethyl polysiloxane

Convenient 2 m length is ideal for use as a secondary column in GCxGC analyses.
Engineered to be a low bleed GC/MS column.
Excellent inertness for active compounds.
General purpose columns.
Temperature range: -60 °C to 350 °C.

Rxi-17Sil MS Secondary Columns for GCxGC (fused silica)

midpolarity Crossbond phase

Convenient 2 m length is ideal for use as a secondary column in GCxGC analyses.
340/360 °C upper temperature limits.
Excellent inertness and selectivity for active environmental compounds, such as PAHs.
Low-bleed for use with sensitive detectors, such as MS.

GCxGC Selectivity Kit, 0.15 mm

Wide range of stationary phases offers orthogonal separations.
High thermal stability increases system ruggedness.
Unrivaled column inertness for accurate analysis of active compounds.
0.15, 0.18, or 0.25 mm ID formats accommodate varying sample capacities, speeds, and detectors.
Secondary columns come in convenient 2 m lengths for economical methods development.

GCxGC Selectivity Kit, 0.18 mm

Wide range of stationary phases offers orthogonal separations.
High thermal stability increases system ruggedness.
Unrivaled column inertness for accurate analysis of active compounds.
0.15, 0.18, or 0.25 mm ID formats accommodate varying sample capacities, speeds, and detectors.
Secondary columns come in convenient 2 m lengths for economical methods development.

GCxGC Selectivity Kit, 0.25 mm

Wide range of stationary phases offers orthogonal separations.
High thermal stability increases system ruggedness.
Unrivaled column inertness for accurate analysis of active compounds.
0.15, 0.18, or 0.25 mm ID formats accommodate varying sample capacities, speeds, and detectors.
Secondary columns come in convenient 2 m lengths for economical methods development.

Rxi Guard/Retention Gap Columns (fused silica)

Extend column lifetime.
Excellent inertness—obtain lower detection limits for active compounds.
Sharper chromatographic peaks by utilizing retention gap technology.
Maximum temperature: 360 °C.

Blog
Literature

ChromaBLOGraphy

posted Wed, Jan 14, 2015

CBDV and THCV on the Rxi-35Sil MS GC Column with Other Cannabinoids

posted Sat, Dec 22, 2012

Selectivity differences for drugs of abuse when using Rxi-5ms and Rxi-5Sil MS GC columns: pendant diphenyl versus silarylene stationary phases.

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, Aug 19, 2013

Combine EPA 521 and EPA 522 into a Single Analysis Using a (Very) Large Volume Injection with an Agilent Style Split/Splitless Inlet

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 Technology

Our 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 Column

GC/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 Performance

Rxi columns demonstrate outstanding column-to-column reproducibility.

Ultra-Low Bleed Columns Improve Trace-Level Analysis

Learn how column bleed affects chromatography and why using Rxi columns can improve your data.

Superior Inertness Ensures Accurate Trace-Level Analysis

Learn why inertness matters and how using Rxi columns can improve your results.

Rxi-5Sil MS Columns: Assured Performance for Forensic Applications

Rxi-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 Separations

Analytical 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 Analysis

Analyze 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 Methods

Separate 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-MS

Typically, 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 Columns

The 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 Brochure

Restek 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 Sheet

Leverage 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 Work

Across 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 Infographic

Phase 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 Column

Polycyclic 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 Analyses

Rxi-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 Columns

Semivolatiles 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)