The Phenomenex Luna C18 HPLC column is a dependable, ultra-pure silica-based high-performance liquid chromatography column. According to the manufacturer, "Luna C18(2) phase is an octadecyl silane phase with ligands bound to the silica surface, resulting in a C18 HPLC column with very hydrophobic stationary phase that offers great methylene selectivity." These columns have a carbon load of 17.5, surface area of 400 m^2/g, and particle sizes of 2.5, 3, 5, 10, and 15. It has a carbon load of 17.5 and a surface area of 400 m²/g³. It's designed for improved methylene selectivity for USP methods or general LC method development.