PE Filter Elements ROTI®XBond, for Empty SPE Columns 150 ml, 100 unit(s)PE Filter Elements ROTIXBond, for Empty SPE Columns 150 ml, Thickness, 2. 5 mm, diameter, 38. 0 mm, pore size, 20 m Material: PE. Further attractive products to complete your chromatography laboratory can be found on our Chromatographypage! Technical Information Designation PE Filter Elements Version for empty SPE PP columns 150 ml 38 mm Pore size 20 m Thickness 2. 5 mm Material PE