Hypersil HPLC Column 30 mm. Hypersil HPLC Column, preparative BDS C18, Carbon Load: 11%, Column Format: Guard 1/8 inch, Reversed Phase,Particle Size: 10 um, Pore Size: 145A, Max. Pressure: 2200 psi (150 bar), pH: 2 to 8, Surface Area: 185m2/g, USP Type: L1, Stationary Phase: C18, 20X30mm