AASHTO M 138M/M 138-08, Standard Specification for Copper Sheet, Strip, Plate, and Rolled Bar, sets the requirements for wrought copper products used in highway and bridge applications such as bearing assemblies, expansion joints and electrical components. It covers the alloys recognized for these product forms, temper designations, mechanical properties, dimensions and permissible variations, and the inspection and marking requirements that accompany each order. Purchasers, fabricators and inspectors use it to confirm that copper items supplied to a project match the grade and temper called for in the contract documents.