1.8 µm particles, 600 bar, available in 2.1 - 4.6 mm id; 30, 50, 100 mm lengths. ZORBAX Eclipse Plus columns feature improved silica, special bonding and optimized endcapping that combine to deliver exceptional peak shapes for a wide range of analytes. Eclipse Plus phases are available in 1.8 µm columns and superficially porous Poroshell 120. Start with ZORBAX Eclipse Plus for method development! Manufactured by Agilent to rigorous QC specifications, the ZORBAX family encompasses 5 particle sizes and more than 32 phases, for reliable scalability and transferability from HPLC to UHPLC, from lab to lab and around the world.