SUPELCOSIL LC-DB phases are specially deactivated for basic compounds. These columns provide shorter retention, better peak shape, and higher efficiency for organic bases than can be obtained on other Type A silica reversed-phase columns.. Extent of Labeling: 11.0% Carbon Loading. Application(s): HPLC: suitable. Sold in each. . . Sigma-Aldrich 58992 SUPELCOSIL LC-18-DB HPLC Column, 3 µm Particle Size, 4.6mm ID, 7.5cm Length. Country of Origin : United States. Part Number : 1190P28EA. Pack of : 1.