The H. S. Martin Perforated Plate design incorporates both precision drilling and geometric symmetry of holes. Equidistant spacing of holes eliminates coalescence and permits a greater number of holes per plate, effectively increasing the boil-up rate and plate efficiency. Similar to the 505030/505035 column except that it is vacuum-jacketed and has internal bellows. All columns are strip-silvered unless otherwise specified. Please specify size and number of plates when ordering.