Tungsten alloys are best suited for applications where there is a requirement for a large weight concentrated in the minimum possible space. They are also an ideal material for high-vacuum technology that needs very high temperatures.
Machining pure tungsten is a challenge as it is moderately brittle; however, when chemical elements such as copper, nickel, and iron are added, tungsten alloys are created which possess exceptionally useful properties. They are more than 50% heavier than lead and twice as heavy as steel. Tungsten alloys have thus become a vital material for a wide range of applications.