Delta-Pak™ HPLC columns are based on highly stable, bonded, endcapped 5 μm or 15 μm spherical 100% silica-based particles.  These columns are offered in two different pore sizes -- 100Å or 300Å -- with either C4 or C18 ligands to address different selectivity and retentivity needs. They are available in different 15 μm cartridge and column configurations, providing consistent and predictable scale-up capabilities for milligram-to-gram scale purification. The same chemistry is also available in higher-resolving 5µm particles, making it possible to easily check the purity of isolated fractions collected from purification chromatography.