Hydroguard™ MXT® Guard Columns and Transfer Lines
By Restek
Use guard columns to:
- Reduce effects of dirty samples on column performance.
- Reduce downtime and maintenance.
- Extend analytical column lifetime; prevent degradation by water injections.
- Withstand harsh "steam-cleaning" chromatography processes.
- 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. With the Hydroguard™ deactivation process, 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 fused silica surface beneath.
Use Hydroguard™ Tubing for connecting guard columns to any analytical instrument that needs an inert, water-resistant sample pathway. 30- and 60-meter lengths are banded in 5-meter sections. Recommendation: Cut 60m guard columns into shorter lengths. Using full length may cause peak distortion.