Engineering materials 

Materials science in the media over the years develops continuously. The term material is divided in different categories.Some of these categories are the ceramics and classes, polymers, metal alloys. The category for ceramics and glasses mentioned in brittle materials.In adhesion to ceramics and glasses used covalent and ionic types. For example, silicon dioxide and sand. The category for polymers are the raw materials used to make plastics. Some metals materials used today are steel, tool steel, cast iron. In this category distinguishes the material strength perpendicular. In my opinion the best category is metals materials because doing harder materials increase the safety.