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GC COLUMNS | METAL MXT® CAPILLARY COLUMNS
General-Purpose Columns
Intermediate-Polarity Deactivated MXT® Guard/Retention Gap Columns/
Transfer Lines (passivated stainless steel)
• Useful for a wide range of applications.
• Compatible with most common solvents.
• Maximum temperature: 325 °C.
Hydroguard®-Treated MXT® Guard/Retention Gap Columns/Transfer Lines
(passivated stainless steel)
• Extend analytical column lifetime by preventing degradation from harsh
“steam-cleaning” water injections.
• Maximum temperature: 325 °C.
When transfer lines from purge-and-trap systems, air monitoring equipment, or other
instruments carry condensed water vapor, deactivated column tubing quickly becomes
active because of the creation of free silanol groups. These silanol groups adsorb active
oxygenated compounds, such as alcohols and diols.
Restek chemists have addressed this concern and found a solution—Hydroguard® de-
activated tubing. A unique deactivation chemistry creates a high-density surface that
is not readily attacked by aggressive hydrolysis. The high-density surface coverage of
the Hydroguard® deactivation layer effectively prevents water vapor from reaching the
surface beneath. Use Hydroguard® tubing for connecting GCs to:
• Headspace analyzers.
• Air analysis equipment and concentrator units.
• Purge-and-trap systems.
*30-meter lengths are banded in 5-meter sections.
Diameters greater than 0.10 mm are tested with the Grob test mix to ensure high inertness.
5-Meter 5-Meter (6-pk.) 10-Meter
Nominal ID Nominal OD cat.# price cat.# price cat.# price
0.28 mm 0.56 ± 0.025 mm 70044 70044-600 70046
0.53 mm 0.74 ± 0.025 mm 70045 70045-600 70047
5-Meter 10-Meter 30-Meter*
Nominal ID Nominal OD cat.# price cat.# price cat.# price
0.28 mm 0.56 ± 0.025 mm 70080 70083 70086
0.53 mm 0.74 ± 0.025 mm 70081 70084 70087
Connect transfer lines or guard columns directly to your
MXT® columns without compromising your data.
Rugged MXT® low dead volume connectors are Siltek® treated to make them inert to
active compounds, just like our MXT® columns! They can be used at temperatures up to
430 °C without degrading the deactivated layer, and their low thermal mass tracks rapid
oven temperature programming. Kits are available for 0.28 mm, 0.32 mm, and 0.53 mm
ID columns in a standard configuration for column-to-column connections and a “Y”
configuration for connecting two columns to one inlet or one column to two detectors.
In addition to the MXT® union, each kit also contains stainless steel 1⁄32-inch ferrules
and nuts. (See for more details.)
MXT® guard
column
MXT® low dead volume connector
MXT® analytical
column
Connect MXT® columns using an
MXT® low dead volume connector!
also available
Column connector
kits & ferrules
See .
Certificates of analysis for 5 m and 10 m
Restek® guard columns are provided
electronically. To view and download your 5 m
or 10 m guard column certificate, simply visit
then enter
your catalog # and serial #.
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