Beryllium is usually alloyed with copper or nickel to increase their thermal and electrical conductivity. These alloys are used to make items like gyroscopes, springs, electrical contacts, spot-welding electrodes, and non-sparking tools. Other alloys are used for aircraft, spacecraft, and satellites. Beryllium alloys tend to be stiff, lightweight, and stable over a wide range of temperatures (due to its high melting point), making them ideal for aerial equipment.
Beryllium foil is sometimes used in X-ray lithography. The foil is used as a "window" for the X-rays to take clear images of the item being inspected (Figure 2).