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ChemSpider is a free chemical structure database providing fast access to over 26 million structures, properties and associated information.

PubChem homepage

Complete, up-to-date, mineral database containing 4,714 mineral species descriptions and comprehensive picture library of images. These data are linked to mineral tables by crystallography, chemical composition, physical and optical properties, Dana ...

Free chemical structure search engine. Millions of public domain structures. Very fast substructure searching. Results link to data about these structures.

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Material property database with data sheets of thermoplastic and thermoset polymers such as nylon, polycarbonate, polyethylene; metal alloys, aluminum, steel, titanium, nickel, cobalt, and zinc alloys; ceramics, lubricants. Free search tools include...

NIST site provides chemical and physical property data on over 40,000 compounds.

KEY to METALS is the world’s most comprehensive database and knowledge source for steel and nonferrous metals properties and cross-references, with more than 4,000,000 property records for over 150,000 alloys from all over the world.

Free detailed evaluations, comparisons, and ratings of patent search systems. Free patent search tools listed by country. Free patent resources categorized by technology. Free best practice articles in prior art searching.

Chemistry is the study of matter and energy and the interactions between them. Get facts for the elements in the periodic table. Find chemistry demonstrations and experiments and science fair projects. Get chemistry homework help with worked example ...