YMC-Pack Pro C18 column is made of highly purified silica gel, followed by a high-coverage C18 bonding and finish with a unique endcapping procedure utilizing Lewis acid-Lewis base chemistry. 2 μm particle size columns YMC-UltraHT series are specifically designed for high-speed and high throughput analysis. These columns show excellent peak shape for all types of organic molecules, especially basic pharmaceuticals and chelating compounds