Rxi-5Sil MS

Rxi-5Sil MS column

Restek Rxi-5Sil MS GC Columns

Restek Rxi-5Sil MS GC columns are engineered for exceptional inertness, extremely low bleed, and superior reproducibility in demanding GC and GC-MS applications. Featuring a 5% phenyl, 95% dimethylpolysiloxane stationary phase with proprietary silarylene (–Si–) reinforcement, Rxi-5Sil MS provides enhanced thermal stability and improved analyte interaction control compared to traditional 5% phenyl phases. This makes the column exceptionally well suited for sensitive mass spectrometric detection and high-temperature programs.

The strengthened silarylene backbone allows Rxi-5Sil MS columns to maintain structural integrity and selectivity during aggressive oven ramps, while the advanced Rxi® deactivation ensures sharp peak shapes for active, polar, or thermally fragile analytes. Analysts benefit from cleaner baselines, higher signal-to-noise ratios, and increased accuracy—especially when quantifying pesticides, PAHs, SVOCs, drugs of abuse, pharmaceuticals, and other complex mixtures at trace levels.

As an authorized distributor of Restek products, Chrom Tech provides Rxi-5Sil MS columns in a broad range of dimensions meeting EPA, EN, AOAC, and forensic method requirements. Their rugged construction, low bleed performance, and excellent lot-to-lot reproducibility make them ideal for laboratories requiring consistent, high-sensitivity GC-MS results without compromise.

Engineered to excel in both routine and high-temperature MS workflows, Rxi-5Sil MS stands out as a high-performance, low-bleed solution for complex separations requiring maximum analytical reliability.
Key Definitions ▸
Silarylene Reinforcement
A structural modification to the polymer backbone that increases thermal stability and mechanical strength of the stationary phase. This allows Rxi-5Sil MS to withstand more aggressive temperature programs while maintaining low bleed and selectivity.
5% Phenyl, 95% Dimethylpolysiloxane Phase
A balanced low-polarity GC stationary phase widely used for general-purpose separation of a broad range of analytes. Rxi-5Sil MS enhances this classic chemistry with improved inertness and thermal durability.
Ultra-Low Bleed
A critical feature for GC-MS applications where baseline cleanliness and spectral clarity determine detection limits. Rxi-5Sil MS exhibits exceptionally low bleed even under high-temperature conditions.
Rxi® Deactivation
Restek’s proprietary surface treatment that removes active sites within the column, improving peak shapes and analyte recovery for polar, reactive, or highly functionalized compounds.
High-Temperature GC-MS Compatibility
The ability of a GC column to maintain its performance at elevated temperatures without excessive bleed or degradation. Rxi-5Sil MS columns are engineered specifically for rugged, high-temperature MS workflows.
Frequently Asked Questions ▸
What applications best fit the Rxi-5Sil MS column?
Rxi-5Sil MS is ideal for pesticide analysis, PAHs, SVOCs, forensics, drugs of abuse, food safety, pharmaceutical impurities, and any GC-MS method requiring low bleed, excellent inertness, and rugged high-temperature stability.
How is Rxi-5Sil MS different from Rxi-5ms?
Both share similar selectivity, but Rxi-5Sil MS includes a reinforced silarylene backbone that improves high-temperature durability and reduces bleed under aggressive MS conditions, offering enhanced stability compared to Rxi-5ms.
Does Rxi-5Sil MS require special conditioning before use?
No special conditioning is required beyond standard GC-MS column preparation. However, users may benefit from a brief temperature ramp to stabilize baseline bleed prior to quantitative analysis.
Is this column suitable for high-temperature GC-MS?
Yes. The silarylene-reinforced polymer matrix provides excellent thermal stability, allowing the column to perform reliably under high-temperature programs without compromising bleed or selectivity.