Restek High Performance

Rxi Column

Restek Rxi® High-Performance GC Columns

Restek Rxi® high-performance GC columns are engineered to deliver exceptional inertness, reproducibility, and thermal stability across a broad range of analytical workflows. Designed to exceed the demands of modern GC and GC-MS systems, Rxi® columns reduce analyte adsorption, improve peak shape for active and high-boiling compounds, and maintain long-term retention stability under aggressive temperature programs.

As an authorized distributor of Restek products, Chrom Tech supplies the complete Rxi® portfolio, covering low-bleed MS phases, high-temperature formats, phenyl-optimized chemistries, and inert guard columns. The Rxi® family includes key phases and application-specific solutions such as:

  • Rxi-1301Sil MS — enhanced inertness for oxygenates, polar VOCs, and solvents
  • Rxi-Guard — integrated guard protection to extend analytical column lifetime
  • Rxi-XLB — ultra-low bleed for sensitive GC-MS applications
  • Rxi-1ms and Rxi-5ms — industry standards for general-purpose and MS workflows
  • Rxi-5Sil MS, Rxi-35Sil MS, Rxi-17, Rxi-17Sil MS — phenyl selectivity for pesticides, SVOCs, and impurity profiling
  • Rxi-PAH — optimized for high-resolution PAH separations
  • Rxi-624Sil MS — tuned for VOCs, residual solvents, EPA, and USP workflows
  • Rxi-1HT and Rxi-5HT — high-temperature columns for triglycerides, biodiesel, and heavy hydrocarbons

Each Rxi® column is manufactured under strict QC specifications and individually tested with challenging probe analytes to confirm exceptional inertness and reproducibility. With their low bleed, rugged thermal performance, and method-matched selectivity, Rxi® GC columns deliver the reliability and sensitivity required for environmental, pharmaceutical, petrochemical, forensic, flavor/fragrance, food safety, and industrial QA/QC laboratories.
Key Definitions ▸
Rxi® Deactivation Technology
Restek’s proprietary process that dramatically reduces analyte adsorption and improves peak shapes for polar, active, and high-boiling compounds—critical for both GC and GC-MS workflows.
Low-Bleed MS Columns
Columns designed and certified for extremely low stationary-phase bleed at elevated temperatures, enabling improved sensitivity, cleaner backgrounds, and more accurate mass-spectral identification.
Sil Phenyl Selectivity
Specialized phenyl-containing stationary phases (such as Rxi-5Sil MS, Rxi-35Sil MS, and Rxi-17Sil MS) that provide enhanced separation of aromatic compounds, pesticides, semi-volatiles, and pharmaceutical impurities.
High-Temperature (HT) GC Columns
Rugged GC columns (such as Rxi-1HT and Rxi-5HT) engineered for extreme temperatures used in the analysis of high-boiling compounds like triglycerides, heavy hydrocarbons, and biodiesel components.
Guard Columns (Rxi-Guard)
Deactivated precolumns that protect the analytical column from contamination, extending column lifetime and maintaining chromatographic performance without adding significant dead volume.
Frequently Asked Questions ▸
What makes Rxi® GC columns different from standard GC columns?
Rxi® columns are engineered with advanced deactivation, ultra-low bleed characteristics, and highly reproducible manufacturing tolerances, providing superior inertness, better peak shape, and enhanced MS sensitivity compared to conventional columns.
Which Rxi® column should I choose for residual solvent analysis or VOCs?
The Rxi-624Sil MS is optimized for VOCs, residual solvents, and EPA/USP workflows, providing excellent inertness for oxygenates, solvents, and trace-level contaminants.
Which Rxi® columns are best for high-temperature applications?
The Rxi-1HT and Rxi-5HT columns are engineered for extended high-temperature operation, ideal for triglycerides, biodiesel components, and high-boiling hydrocarbons.
Are Rxi® columns suitable for GC-MS?
Yes. Most Rxi® columns—including Rxi-5ms, Rxi-XLB, Rxi-1301Sil MS, and phenyl-containing Rxi-Sil phases—are designed for MS workflows and provide extremely low bleed for improved sensitivity and cleaner spectra.