Rxi-17

Rxi-17 column

Restek Rxi-17 GC Columns

Restek Rxi-17 GC columns are mid-polarity, low-bleed columns engineered to deliver highly reliable and reproducible separations for complex mixtures that contain both polar and nonpolar compounds. Featuring a 50% phenyl, 50% dimethylpolysiloxane stationary phase, Rxi-17 provides strong aromatic and polar interactions, making it ideal for resolving pesticides, flame retardants, PAHs, PCBs, phthalates, pharmaceuticals, and diverse environmental contaminants.

The robust mid-polarity selectivity of Rxi-17 enhances separation of structural isomers and compounds with similar boiling points—areas where nonpolar columns often struggle. Its exceptionally low bleed even at elevated temperatures provides cleaner mass spectra, improved sensitivity, and higher signal-to-noise ratios in GC-MS applications. These qualities make Rxi-17 especially valuable for regulated methods and trace-level quantitation in challenging analytical workflows.

Built with Restek’s advanced Rxi® deactivation process, Rxi-17 columns maintain excellent inertness and produce sharp, symmetrical peaks for active or functionalized compounds that commonly tail on less inert phases. Their rugged construction delivers stable retention times, long column lifetimes, and outstanding lot-to-lot reproducibility.

As an authorized distributor of Restek products, Chrom Tech supplies Rxi-17 columns in a variety of dimensions supporting EPA, EN, AOAC, pharmaceutical, and industrial testing methods. For laboratories requiring robust mid-polarity performance with MS-grade low bleed, Rxi-17 provides a highly dependable and versatile solution.

Key Definitions
50% Phenyl, 50% Dimethylpolysiloxane Phase
A mid-polarity GC stationary phase offering strong interactions with aromatics and moderately polar compounds. This chemistry enhances separation of isomers and complex mixtures containing both polar and nonpolar analytes.
Mid-Polarity Selectivity
A balance between polar and nonpolar retention mechanisms, enabling effective resolution of complex environmental, industrial, and pharmaceutical analytes with diverse chemical structures.
Rxi® Deactivation
Restek’s proprietary surface deactivation that eliminates active sites within the column, producing improved peak shapes and higher recovery for reactive, polar, or fragile analytes.
Low Bleed
Minimal release of stationary phase material during heating, essential for clean mass spectra, stable baselines, and enhanced detection limits in GC-MS analysis.
Isomer Resolution
The ability of a column to separate compounds with identical molecular formulas but different structures. Rxi-17’s mid-polarity phase excels at resolving aromatic and functionalized isomers.
Frequently Asked Questions
What types of applications are best suited for Rxi-17 columns?
Rxi-17 is ideal for pesticides, SVOCs, PCBs, flame retardants, PAHs, phthalates, pharmaceutical impurities, and environmental pollutants—especially when isomer resolution and mid-polarity selectivity are required.
How does Rxi-17 differ from nonpolar columns like Rxi-5ms or Rxi-1ms?
With higher phenyl content, Rxi-17 provides stronger interactions with polarizable and aromatic compounds, leading to improved separation of isomers and mid-polarity analytes compared to less polar phases.
Is Rxi-17 compatible with GC-MS analysis?
Yes. The column’s low-bleed characteristics deliver cleaner baselines and higher sensitivity in GC-MS workflows, supporting trace-level detection across a wide range of analytes.
Why choose Rxi-17 for isomer separations?
The 50% phenyl phase enhances aromatic and dipole interactions, improving resolution of compounds that are difficult to separate on nonpolar phases—making Rxi-17 highly effective for complex isomeric mixtures.