The cyanopropyl-containing Rtx®-225 phase is slightly less polar than bonded polyethylene glycol (PEG) phases, but it can be used for many of the same applications.

• General-purpose columns for FAMEs, carbohydrates, sterols, flavor compounds
• Equivalent to USP G7, G19 phases
• Polar phase; Crossbond® cyanopropylmethyl phenylmethyl polysiloxane

Improvements to the Rtx®-225 polymer have increased thermal stability, reduced bleed, and improved inertness. The Rtx®-225 column provides a 20 °C thermal stability advantage over other '225' columns because of Restek's unique polymer synthesis technology and proprietary siloxane deactivation.