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
carbon load: 5%
endcap: yes
pH range: 2.5 to 8
temperature limit: 80 °C
USP phase code: L7
phase category: C8, octylsilane
ligand type: monomeric C8
properties: general purpose C8