Transmitted herewith are two copies of the final report covering piping materials for sodium piping in LMFBR piping systems. The purpose of the study was to conduct a state-of-the-art survey on the selected materials for sodium piping. Basic properties and data on the effects of environmental conditions were compiled for use in preparation of the piping design guide. Some additional literature data has been added since the preliminary draft report was issued for review. Comments on the report from reviewers will be welcome but further revision is not contemplated.