Viva columns are based on a wide pore material we designed for optimal large molecule separations. In developing Viva silica, we found that although many commercial wide-pore silicas meet the standard 300 Å mean pore size, most have very broad distributions about this mean, with a significant portion of their pore volume falling below 150 Å. This means a large portion of the surface area is unavailable to larger molecules. Viva columns have a narrow distribution around the mean pore size, permitting a larger portion of the silica surface to play a role in the separation.

particle size: 5 µm, spherical
pore size: 300 Å
pH range: 2.5 to 8
temperature limit: 80 °C
USP phase code: L3
phase category: bare silica
ligand type: none
properties:

• High-purity, high–surface area silica.
• General-purpose column for normal phase and HILIC modes.