Epic C18 MSO (mass spec optimized) is specifically engineered for the demands of LC-MS with or without the use of ultra-high pressure pumps. The flexibility of Epic C18-MSO is the result of our research into optimal particle diameters that can be used for both routine and ultra-high pressure pumping systems. Epic C18-MSO is based upon 2.3um fully porous particles giving it superior retention even at high organic levels while maintaining excellent sample loading.