Legacy L1 columns meets the USP definition and has a stationary phase that consists of octadecyl silane chemically bonded to porous silica or ceramic particles (1.5 to 10µm).

Legacy L1 columns are available in all standard dimensions 
Column IDs: 22 mm, 10 mm, 4.6 mm, 3.2 mm, 2.1 mm, 1 mm, 0.5 mm, 0.25 mm
Column Lengths: 250 mm, 150 mm, 100 mm, 50 mm, 25 mm, 10 mm
Particles: 5 um
Pores: 100 A

USP Methods for the Separation of Propranolol and Procainamide using a Legacy L1 Column
USP Methods for the Analysis of Pyridoxine for the Legacy L1 Column
USP Methods for the Analysis of Procainaide using the Legacy L1 Column
USP Methods for the Analysis of Prednisolone with the Legacy L1 Column