Technical Skills: Knowledge of Materials Sample preparation, Etching and evaluation of metallographic specimens of bar stock, blade forging and aircraft parts (metallic and non-metallic materials); knowledge of Preparation techniques, and examination of metallurgical specimens including polishing, SEM or optical microscope evaluation, hardness testing, grain size evaluation, among others. Includes those working with composite materials or specializing in one type of material, such as graphite, metal and metal alloys, ceramics and glass, plastics and polymers, and naturally occurring materials for analyzing product failure data and laboratory test results to determine causes of problems and develop solutions.