Welch Materials Ultisil XB (Extended) Columns

In Welch Materials' Ultisil chromatography range, XB denotes their original, foundational series of HPLC columns. It stands for Extended Bonding (or Extended Base), representing the core reversed-phase and normal-phase silica packings that provide complete bonding chemistries for general method development.

Silica Foundation: These columns are based on ultra-pure, totally porous, spherical silica with a purity greater than 99.999%.

Versatility: The XB suffix is typically attached to a ligand (like XB-C18, XB-C8, XB-CN, or XB-NH2). XB-C18, for example, serves as a universal, standard column for the separation of complex samples.

Cross-Reference: The XB series is often used as a direct, general-purpose substitute for industry-standard columns like the Agilent Zorbax XDB-C18 or Phenomenex Luna C18

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