Skip Navigation
Depleted UF6 Logo (Go to Home Page)

DUF6 GuideDUF6 Guide
 Overview Presentation
 Uranium and Its Compounds
 Depleted Uranium
 Uranium Hexafluoride
 Production and Handling
 DUF6 Health Risks
 DUF6 Environmental Risks
 DUF6 Videos
 Uranium Quick Facts

Mailing List Signup
Receive e-mail updates about this project and web site.
DUF6 Guide DU Uses DUF6 Management and Uses DUF6 Conversion EIS Documents  News FAQs Internet Resources Glossary

Uranium Metal and Alloys

Source: Appendix A of the PEIS (DOE/EIS-0269)

Physical Properties

Uranium metal appears as a heavy, silvery white, malleable, ductile, softer-than-steel, metallic element. It is one of the densest materials known (19 g/cm3), being 1.6 times more dense than lead. Uranium metal is not as stable as U3O8 or UF4 because it is subject to surface oxidation. It tarnishes in air, with the oxide film preventing further oxidation of massive metal at room temperature. Water attacks uranium metal slowly at room temperature and rapidly at higher temperatures. UO2 and uranium hydride (UH3) are formed while heat is evolved, and the metal swells and disintegrates. It melts at 1,132°C.

Chemical Properties

Uranium powder or chips will ignite spontaneously in air at ambient temperature. During storage, uranium ingots can form a pyrophoric surface because of reaction with air and moisture. Uranium metal will also react with water at ambient temperature, forming UO2 and UH3. The metal swells and disintegrates. Hydrogen gas can be released.

Solid uranium, either as chips or dust, is a very dangerous fire hazard when exposed to heat or flame. In addition, uranium metal can react violently with chlorine (Cl2), fluorine (F2), nitric acid (HNO3), selenium (Se), sulfur (S), ammonia (NH3), bromine fluoride (BrF3), trichloroethylene (TCE), or nitryl fluoride and similar compounds.

e-mail icon E-mail to a friend