Rxi-1HT

Rxi-1HT column

Restek Rxi-1HT GC Columns

Restek Rxi-1HT GC columns are engineered for high-temperature analysis of complex, high-boiling compounds that exceed the thermal limits of standard 100% dimethylpolysiloxane phases. Designed to withstand maximum operating temperatures up to 430 °C, Rxi-1HT columns deliver exceptional thermal stability, low bleed, and long lifetime in applications such as hydrocarbon analysis, high-boiling petrochemicals, lubricants, plasticizers, synthetic oils, and semi-volatiles that require elevated temperatures for complete elution.

The Rxi-1HT phase features a specially engineered Crossbond®-style high-temperature polymer formulated to resist degradation, minimize stationary-phase bleed, and maintain long-term performance under continuous high-temperature cycling. This advanced design ensures excellent peak shapes and reliable retention, even for heavy compounds prone to thermal tailing on conventional nonpolar phases.

With extremely low bleed at high temperatures, Rxi-1HT columns provide cleaner baselines and improved sensitivity in GC-MS workflows, making them suitable for both routine high-boiling analysis and trace-level MS detection. Their robust construction also provides outstanding column lifetime, reducing maintenance and improving overall lab productivity.

As an authorized distributor of Restek products, Chrom Tech supplies Rxi-1HT columns in multiple configurations, supporting petroleum, chemical manufacturing, specialty chemical, fragrance, and high-temperature material testing laboratories that demand reliable, thermally rugged GC performance.
Key Definitions ▸
High-Temperature (HT) GC Column
A GC column specifically engineered to tolerate extremely high oven temperatures (above 350 °C) without degrading. Rxi-1HT supports temperatures up to 430 °C for eluting heavy, high-boiling compounds.
100% Dimethylpolysiloxane Phase
A nonpolar stationary phase ideal for hydrocarbons, lubricants, petrochemicals, and high-boiling analytes. Rxi-1HT uses a thermally reinforced version of this phase for enhanced temperature durability.
Thermal Stability
The ability of a column’s polymer phase to resist breakdown and maintain performance during extended exposure to high temperatures. Rxi-1HT is optimized for long-term high-temperature cycling.
Low Bleed at High Temperatures
A critical performance metric for HT GC columns. Low bleed improves GC-MS sensitivity, baseline stability, and long-term analytical reliability.
High-Boiling Compound Elution
The process of driving heavy or thermally stable analytes off the column. Rxi-1HT’s 430 °C upper limit enables complete elution of compounds that cannot be resolved on standard-temperature columns.
Frequently Asked Questions ▸
What applications are best suited for Rxi-1HT columns?
Rxi-1HT is ideal for analyzing high-boiling hydrocarbons, lubricants, heavy petrochemicals, plasticizers, high-temperature industrial compounds, fragrance fixatives, and other analytes requiring oven temperatures above 350 °C.
Can Rxi-1HT columns be used with GC-MS systems?
Yes. Their extremely low bleed at very high temperatures makes them well-suited for GC-MS analysis of heavy compounds that would overwhelm standard GC-MS columns.
How does Rxi-1HT differ from standard nonpolar Rxi-1ms columns?
Rxi-1HT uses a thermally reinforced polymer engineered for 400+°C operation, while Rxi-1ms is optimized for low bleed and MS performance at moderate temperatures. Rxi-1HT is the correct choice for high-boiling analytes requiring extreme temperatures.
What are the benefits of a high-temperature limit up to 430 °C?
It allows complete elution of very heavy or thermally stable compounds, prevents buildup of non-eluting residues, improves column lifetime, and ensures cleaner baselines and more accurate quantitation for difficult high-boiling mixtures.