USP Columns Listing ("L" Numbers)

The USP provides a code with a corroborating generic column packing description suitable for pharmaceutical monographs. Most column manufacturers will display the L number in their literature.

USP Listing Code	Description	Shim-Pack Example
L1	Octadecyl silane chemically bonded to porous silica or micro-particles, 1.5 to 10 μm in diameter, or a monolithic rod	Arata C18, Scepter C18, Scepter HD-C18, Velox C18, Velox SP-C18, GIST C18, GIST HP-C18, GIST C18-AQ
L3	Porous silica particles, 1.5 to 10 μm in diameter, or a monolithic rod	Velox HILIC
L7	Octyl silane chemically bonded to totally porous silica particles, 1.5 to 10 μm in diameter, or a monolithic rod	Scepter C8, GIST C8, GIST HP-C8
L8	An essentially monomolecular layer of aminopropyl silane chemically bonded to totally porous silica gel support, 1.5 to 10 μm in diameter, or a monolithic rod.	GIST NH2
L11	Phenyl groups chemically bonded to porous silica particles 1.5 to 10 μm in diameter, or a monolithic rod	Scepter Phenyl, Velox Biphenyl, GIST Phenyl, GIST HP-Phenyl, GIST Phenyl Hexyl
L20	Dihydroxypropane groups chemically bonded to porous silica particles 5 to 10 μm in diameter	Scepter Diol-HILIC
L43	Pentafluorophenyl groups chemically bonded to silica particles, 5 to 10 μm in diameter	Scepter PFPP, Velox PFPP