MatWeb, provided by Automation Creations, Inc., provides information on over 2,000 engineering materials, including polymers, aluminum and titanium alloys, steels, ceramics, and other metals. Information can be retrieved via three search mechanisms-property match, category/property match, and property group. Properties used for searches include electrical resistivity and a variety of hardness classifications. Searches can also be limited by specifying one of over 50 material categories. MatWeb also provides links to related sites and a chart for converting between metric and English units.