Rxi-17Sil MS

Rxi-17Sil MS column

Restek Rxi-17Sil MS GC Columns

Restek Rxi-17Sil MS GC columns combine enhanced mid-polarity selectivity with exceptionally low bleed and rugged high-temperature stability, delivering powerful performance for GC-MS analysis of complex and highly functionalized compounds. Featuring a 50% phenyl, 50% dimethylpolysiloxane stationary phase reinforced with Restek’s proprietary silarylene (–Si–) backbone, Rxi-17Sil MS offers stronger interactions with aromatic, polarizable, and moderately polar analytes than nonpolar phases, while maintaining superior thermal durability and inertness.

The silarylene-strengthened polymer matrix provides outstanding column stability under aggressive temperature programs, reducing bleed and producing cleaner mass spectra for ultra-trace detection. Combined with Rxi® deactivation chemistry, the column delivers symmetrical peak shapes for active, oxygenated, or derivatized compounds that often show tailing on less inert phases.

Rxi-17Sil MS columns are an excellent fit for challenging environmental, pharmaceutical, industrial, and food-safety separations—particularly when resolving structural and positional isomers, semi-volatiles, PAHs, PCBs, flame retardants, and other mid-polarity analytes requiring MS-grade sensitivity. Their thermal endurance, lot-to-lot consistency, and wide applicability make them a reliable column choice for both routine testing and advanced GC-MS workflows.

As an authorized distributor of Restek products, Chrom Tech supplies the full range of Rxi-17Sil MS column dimensions to support EPA, EN, AOAC, and industry-standard methods that demand robust, reproducible mid-polarity performance with enhanced MS compatibility.
Key Definitions ▸
Silarylene (–Si–) Reinforced Backbone
A strengthened polymer structure incorporated into the stationary phase to improve thermal stability, reduce bleed, and preserve selectivity during high-temperature GC-MS operation.
50% Phenyl, 50% Dimethylpolysiloxane Phase
A mid-polarity stationary phase offering enhanced interactions with aromatic, polarizable, and moderately polar compounds—ideal for resolving complex mixtures with overlapping boiling points or similar structures.
Ultra-Low Bleed
Significantly reduced stationary-phase bleed during temperature programming, resulting in cleaner mass spectra, higher sensitivity, and better peak fidelity—critical for trace-level MS detection.
Rxi® Deactivation
Restek’s advanced surface treatment that eliminates active sites, improving peak shapes and minimizing analyte adsorption for active, oxygenated, or reactive compounds.
Isomeric Resolution
The ability to separate compounds with identical molecular formulas but different structures. Rxi-17Sil MS excels at resolving positional isomers, aromatic isomers, and complex semi-volatiles.
Frequently Asked Questions ▸
What types of applications benefit most from Rxi-17Sil MS columns?
Rxi-17Sil MS is ideal for separating pesticides, SVOCs, PCBs, PAHs, flame retardants, phthalates, environmental pollutants, pharmaceuticals, and structural isomers requiring mid-polarity selectivity with MS-grade sensitivity.
How does Rxi-17Sil MS differ from standard Rxi-17 columns?
The “Sil MS” version features silarylene reinforcement, providing lower bleed, greater thermal stability, and improved GC-MS performance under aggressive temperature programs compared to the non-reinforced Rxi-17 version.
Is Rxi-17Sil MS compatible with high-temperature GC-MS workflows?
Yes. The reinforced polymer structure supports aggressive oven ramps and high-temperature conditions with minimal bleed, making it suitable for demanding GC-MS applications requiring thermal durability.
Why choose a 50% phenyl phase for GC-MS analysis?
The high phenyl content provides enhanced interactions with aromatic and moderately polar compounds, enabling superior resolution of isomers and structurally similar analytes—areas where nonpolar columns often fail.