The Ultra line represents Restek’s broadest selection of stationary phases on a single silica support. Made of high-purity, type B silica that minimizes activity and creates high density bonding, these columns are designed for selective and reliable HPLC applications.

particle size: 3 µm or 5 µm, spherical
pore size: 100 Å
carbon load: 15%
endcap: no
pH range: 2.5 to 8
temperature limit: 80 °C
USP phase code: L1
phase category: modified C18
ligand type: proprietary polar modified and functionally bonded C18
properties:

• General purpose with a well-balanced retention profile.
• Compatible with 100% aqueous mobile phases.
• Ideal for multi-component LC-MS analyses.