CDS Empore 2215 and 2315 Environmental C18 Disks utilize C18-HD bonded silica with a 12 µm particle size for strong non-polar analyte extraction. These solid phase extraction (SPE) disks offer excellent retention capacity and high recovery efficiency. End-capped to minimize polar interactions, they are recommended for a wide range of EPA Methods, including 506, 508.1, 525.2, 550.1, 608, 1613B, and others.