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GC COLUMNS
Fused Silica Guard/Retention Gap Columns
Base-Deactivated Guard/Retention Gap Columns (fused silica)
• Tested with a basic amine test mix.
• Excellent inertness for basic compounds.
• Recommended for use with Rtx®-5 Amine, Rtx®-35 Amine, Rtx®-Volatile Amine,
and Stabilwax®-DB capillary columns.
• Batch test chromatogram included.
• Maximum temperature: 315 °C.
Chemists using guard columns in the analyses of basic compounds frequently observe
peak tailing and low recovery. This happens because conventionally deactivated tubing
surfaces can be adsorptive to basic compounds. Restek offers base-deactivated guard
columns, as well as base-deactivated inlet liners, for completely inert sample pathways.
Hydroguard®Water-Resistant Guard/Retention Gap Columns/
Transfer Lines (fused silica)
• Extend analytical column lifetime by preventing degradation from harsh
“steam-cleaning” water injections.
• Tested with a comprehensive test mix, to ensure high inertness.
• 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 these devices:
• Headspace analyzers.
• Air analysis equipment and concentrator units.
• Purge-and-trap systems.
*30- and 60-meter lengths are banded in 5-meter sections.
†Recommendation: Cut 60 m guard columns into shorter lengths. Using full length may cause peak distortion.
did you know?
We test our guard columns/transfer
lines with a comprehensive test mix
to ensure high inertness.
also available
Metal MXT® Guard/.
Retention Gap Columns
Rugged, flexible, Siltek®-treated stainless
steel tubing for use with MXT® .
columns; inertness .
comparable to fused .
silica tubing.
See .
5-Meter 5-Meter/6-pk.
Nominal ID Nominal OD cat.# price cat.# price
0.25 mm 0.37 ± 0.04 mm 10000 10000-600
0.32 mm 0.45 ± 0.04 mm 10001 10001-600
0.53 mm 0.69 ± 0.05 mm 10002 10002-600
5-Meter 5-Meter/6-pk. 10-Meter 30-Meter* 60-Meter*†
Nominal ID Nominal OD cat.# price cat.# price cat.# price cat.# price cat.# price
0.05 mm 0.363 ± 0.012 mm 10075
0.10 mm 0.363 ± 0.012 mm 10076
0.15 mm 0.363 ± 0.012 mm 10077
0.18 mm 0.37 ± 0.04 mm 10078
0.25 mm 0.37 ± 0.04 mm 10079 10079-600 10082 10085
0.32 mm 0.45 ± 0.04 mm 10080 10080-600 10083 10086
0.53 mm 0.69 ± 0.05 mm 10081 10081-600 10084 10087 10090
also available
Press-Tight connectors.
See
See pages .
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