radius between bottom 12 and side walls 13 and 14 is at least 0 125 inches through an angle of at least 75 u00b0 fig6 and 7 show details of terminals 20 and 21 non conductive matrix 22 and the hermetic seals associated with the terminals terminal 20 has rivet 28 which is attached to lead 29 for example by welding the two materials together rivet 28 is electrically connected to tab 6 and fixed in place by deforming bucking the rivet rivet 28 and lead 29 are made of dissimilar metals rivet 28 may be aluminum or other valve metal resistant to the electrolyte in the capacitor lead 29 may be a metal that can be welded to rivet 28 and can be soldered to the hermetic seal such as a tin plated copper lead while the details of construction are illustrated with regard to terminal 20 it can be understood that terminal 21 may be constructed the same or similar to terminal 20 referring to fig7 terminal 21 has rivet 30 and lead 31 extending therefrom in one embodiment of the invention terminals 20 and 21 are embedded in the non conductive matrix 22 prior to final assembly for example non conductive matrix 22 may.