Ultra II is the first LC column line from Restek that is specifically designed for universal application for optimal chromatography on any system.
This column line is built on a highly inert, high surface area silica to provide excellent column-to-column reproducibility.
Columns are available in a range of particle sizes - 1.9um, 2.2um, 3um and 5um - allowing for scalable chromatography on any type of LC instrument, from conventional to ultra-high-pressure systems.
Ultra II columns are available in traditional phases and unique chemistries that provide alternate selectivity.
Where superior retention and selectivity for aromatic and/or unsaturated compounds is required, the Aromax and Biphenyl columns in this range are a good alternative to the C18 column and are suitable for the analysis of steroids, tetracyclines, drug metabolites and other compounds that contain some degree of unsaturation.