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GC COLUMNS | GENERAL-PURPOSE COLUMNS
Rtx®-225
Rtx®-225 Columns (fused silica)
(polar phase; Crossbond® cyanopropylmethyl phenylmethyl polysiloxane)
• General-purpose columns for FAMEs, carbohydrates, sterols, flavor compounds.
• Temperature range: 40 °C to 240 °C.
• Equivalent to USP G7, G19 phases.
The cyanopropyl-containing Rtx®-225 phase is slightly less polar than bonded polyeth-
ylene glycol (PEG) phases, but it can be used for many of the same applications.
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 our unique polymer synthesis technol-
ogy and proprietary siloxane deactivation. In most similar columns, the Carbowax®
deactivation layer is not fully compatible with the cyanopropyl siloxane polymer,
which can cause adsorption, tailing of active compounds, and lower efficiency.
Rtx®-225 Structure
CH3
(CH2)3
CH3
Si
50%
O Si
C N
50%
O
*Maximum temperatures listed are for shorter length columns. Longer columns may have a different maximum temperature.
Similar to: (50%-cyanopropylmethyl)-methylphenylpolysiloxane
similar phases
DB-225ms, CP-Sil 43 CB
15-Meter 30-Meter 60-Meter
ID df temp. limits* cat.# price cat.# price cat.# price
0.25 mm 0.25 µm 40 to 220/240 °C 14020 14023 14026
0.50 µm 40 to 220/240 °C 14038
0.32 mm 0.25 µm 40 to 220/240 °C 14021 14024
0.50 µm 40 to 220/240 °C 14039
1.00 µm 40 to 200/220 °C 14051 14054 14057
0.53 mm 0.25 µm 40 to 200/220 °C 14022 14025
0.50 µm 40 to 200/220 °C 14040
1.00 µm 40 to 200/220 °C 14052 14055
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