Hypersil HPLC Column 250 mm. Hypersil HPLC Column, preparative HS C18, XtendedLife, Reversed Phase, Particle Size: 5 um, Pore Size: 100A, Max. Pressure: 3500 psi (240 bar), pH: 2 to 8, Surface Area: 350m2/g, Temperature: 60deg C, USP Type: L7, Stationary Phase: C8, Dimensions: 250X25mm