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What is an MXT® column?
MXT® columns are made from stainless steel tubing that has had
the internal surface treated with our exclusive Siltek® surface
treatment. The Siltek® layer makes the surface as inert as deacti-
vated fused silica. The unique Siltek® process enables us to offer
MXT® columns in a wide range of internal diameters, including
0.18 mm, 0.25 mm, 0.32 mm, and 0.53 mm. Because the Siltek®
layer permeates the stainless steel surface, rather than simply
coating it, the layer is exceptionally flexible, so the tubing can be
coiled to very small diameters. The standard coil diameter for
MXT® columns is 4.5 inches. The minimum coil diameter for
0.53 mm ID columns is 2.5 inches, and the minimum coil diam-
eter for 0.25 mm ID columns is 1.5 inches.
The unique properties of the Siltek® treated surface enable us to treat the tubing with a wide variety of
polymer phases. The many choices of MXT® columns include:
www.restek.com
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GC COLUMNS |
METAL (MXT®) CAPILLARY COLUMNS
MXT® Columns Over view
• MXT®-1
• MXT®-5
• MXT®-20
• MXT®-35
• MXT®-50
• MXT®-65
• MXT®-1301
• MXT®-1701
• MXT®-200
• MXT®-WAX
• MXT®-65TG
• MXT®-Biodiesel TG
• MXT®-2887
• MXT®-1HT SimDist
• MXT®-1 SimDist
• MXT®-500 SimDist
• MXT®-502.2
• MXT®-Volatiles
• MXT®-624
• Guard tubing
Compare MXT® columns and fused silica columns:
• Metal tubing allows MXT® columns to be used to higher temperatures (430 °C) than fused silica columns
(standard rating is 360 °C). This is because the polyimide resin that encases the fused silica becomes brittle
over time at high temperatures. MXT® columns do not become brittle.
• Inertness of MXT® columns and fused silica columns is similar, due to the unique properties of the Siltek®
surface treatment in MXT® columns.
• Metal columns can be coiled under 4.5 inches without breaking, ideal for small instruments.
• Coating efficiency (plates/meter) of MXT® columns is similar to that of fused silica.
• MXT® columns will not break under stress, and they can be coiled to small diameters.
MXT® columns are your best choice for:
• Situations in which the potential for column breakage is high:
• field instruments
• process GC
• GCs with small ovens, such as portable instruments, requiring tightly coiled columns.
• High temperature chromatography. Siltek® deactivated stainless steel tubing can withstand temperatures
exceeding 430 °C; the only limitation to oven temperature is the polymer itself.
CustomMXT® columns
We are able to supply 0.18, 0.25, 0.28, 0.32, and 0.53 mm ID columns with the phases listed above in many
different configurations. If you do not see the column you need listed in the following pages, call us or your
Restek representative, and we will be happy to help.
MXT®-Biodiesel TG columns are undamaged by high thermal cycles compared to
high-temperature fused silica columns which break down under the same conditions.
100 temperature cycles to 430 °C totaling 500 minutes at maximum temperature.
MXT®-Biodiesel TG columns are
undamaged by high thermal cycles.
HT fused silica columns, labeled as stable
to 430 °C, show pitting and breakdown.
MXT
ideal for
high-temperature
analyses
also
available
Metal PLOT
columns!
See pages 108-110.
Website : www.chromtech.net.au E-mail : info@chromtech.net.au TelNo : 03 9762 2034 . . . in AUSTRALIA
Mar 2011