The metallurgical integrity of frit vent assemblies produced by Martin Marietta Energy Systems, Inc. (Energy Systems) were compared to those produced G‐Mound Applied Technologies, Inc. (EG&G‐MAT). Frit vent assemblies were metallographically prepared and examined at magnifications from 50X to 1000X. Scanning electron microscope (SEM) examinations were made of the diffusion bonded powder in finished frit vent assemblies produced by Energy Systems and EG&G‐MAT. The metallographic and SEM examinations of the particle‐to‐particle and particel‐to‐foil component diffusion bonds indicated that the Energy Systems‐produced and EG&G‐MAT‐produced frit vent assemblies have comparable metallurgical integrity. The Energy Systems production data show that the frit vent manufacturing yield is 91%. © 1995American Institute of Physics