Materials Database
matweb.com
Material property database with data sheets of thermoplastic and thermoset polymers such as nylon, polycarbonate, polyethylene; metal alloys, aluminum, steel, titanium, nickel,...
48,004 
$ 280,080.00
materialsproject.org
The Materials Project's mission is to accelerate the the discovery of new technological materials through advanced scientific computing and innovative design tools.
89,721 $ 149,760.00