Shim-pack Scepter columns consist of an organic silica hybrid particle for excellent stability and performance under a wide range of LC conditions. Similar to Acquity BEH C18, and Kinetix Gemini C18. USP L1, 120A pore size, pH range 1-12. Compatible with 100% aqueous conditions. Guard column 227-31120-01 and EXP holder 227-32041-01 are recommended to prolong the analytical column lifetime.