A plate is disclosed for use in a plate-fin heat exchanger, comprising a generally planar elongated member (12) having a longitudinal rib (24) disposed along the longitudinal length of the member. The plate further includes a first plurality of beads (30) having a height greater than the height of the rib as well as a second plurality of beads (34) having a height approximately equal to the height of the longitudinal rib. The beads (30) are arranged generally in rows having a planar space of predetermined longitudinal length therebetween into which an adjoining row of beads is placed when a pair of identical plates are laminated together in a face-to-face relationship and forming a heat exchanger. A heat exchanger comprising a plurality of stacked plates (12) generally as described above is also disclosed.