An aluminum alloy is a chemical composition where other elements are added to pure aluminum in order to enhance its properties, primarily to increase its strength. Aluminum is commonly used in equipment for orthopedic, endoscopic, craniomaxillofacial, spine, trauma, surgical instruments and for general hospital equipment. Surgical cases, containers, trays and kits and other devices made from aluminum are preferable to stainless steel or plastic counterparts. Alloys in which aluminum (Al) is the predominant metal. The typical alloying elements are copper, magnesium, manganese, silicon, tin and zinc