http://matweb.com/

MatWeb's (http://matweb.com/search/search.aspx)[searchable database of material properties] includes data sheets of thermoplastic and thermoset polymers such as ABS. nylon. polycarbonate, polyester, polyethylene and polypropylene; metals such as aluminum, cobalt, copper, lead, magnesium, nickel, steel, superalloys, titanium and zinc alloys; ceramics; plus semiconductors, fibers, and other engineering materials.

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