Shim-pack Scepter columns consist of an organosilane hybrid particle for excellent stability and performance under a wide range of LC conditions. Similar to Acquity BEH C18, Xterra C18, and Gemini C18. USP L1, pH range: 1-12, Max pressure: 45 MPa/450 bar/6,500 psi. 120A particle size, 20% carbon load, fully endcapped.