Searchable database of material properties includes data sheets of thermoplastic and thermoset polymers such as nylon and polyester; aluminum, cobalt, and other metals and alloys; plus semiconductors, fibers, and other engineering materials.
Part of the National Institute of Standards and Technology's portal, Chem WebBook offers data on organic and inorganic compounds and reactions: thermochemical, IR, mass, UV, visible, electronic, physical constants. Search by name, formula, CAS registry, molecular weight.
A comprehensive searchable database of enzymes, BRENDA is maintained by the Institute of Biochemistry at the University of Cologne. Scientists collect and evaluate enzyme functional data from primary sources. Links to literature citations, images, and other databases.
Free chemical database searches 26 million+ structures, by registry numbers and other identifiers, elements, text sources, properties, and a structure-drawing program. Award-winning site from the Royal Society of Chemistry.
Databases on toxicology, hazardous chemicals, environmental health, and toxic releases from the National Library of Medicine. Includes ChemIDplus: search by name or registry number for information on structure, properties, and toxicity. Update: Information moved to other NLM sites...click on link above.