Metallic, non-metallic and composite materials used as structural and instrumental materials are considered, and recommendations for their use are given. Methods for studying the structure and properties of materials are presented. The characteristics of the mechanical, physical and technological properties of materials are presented. Based on the testing results, a number of measurements were introduced. For the first time, technological materials used in welding and soldering are considered, the chapter “Tool Materials” is significantly expanded and supplemented with practical recommendations. For students of primary vocational education institutions. Can be used in other forms of training