WM series capillary columns come with a complete range of stationary phases, including polydimethylsiloxane, cross-linked polyethylene glycol (PEG), and PLOTs, among others. Welch Materials offers capillary columns in various specifications and models, providing users with the flexibility to choose according to their preferences. Moreover, Welch Materials can customize columns to meet specific requirements as per user needs. WM series capillary columns are produced through a strict manufacturing process, with each chromatography column undergoing rigorous performance testing. The column performance is comparable to or even superior to some well-known brands.