ZORBAX Rapid Resolution HT (RRHT) columns are an exciting technology for fast and ultra-fast HPLC separations with more resolving power. ZORBAX RRHT is the first sub-2 µm (1.8 µm), totally porous packing available for ultra-fast separations including high throughput analyses and high speed LC/MS. The small particles provide high resolving power while short column lengths (15-50 mm) enable high-speed analyses.