| Analytical Science and Instruments Limited | | Providing information to the scientific community on all aspects of the analytical sciences in education, chemical suppliers, consultancies, instrumentation and research. |
| CCINFOweb | | Web access to health and safety databases covering over 185000 chemical substances. Provided by Canadian Centre for Occupational Health (CCOHS). Free access to CHEMINFO database. |
| Chem Sources-Online | | Supplier information for approximately 200000 chemical compounds. Searching for compounds is free, the supplier information is fee based. |
| ChemBank | | Initiative for Chemical Genetics. Freely available collection of data about small molecules (over 2000 compounds) and resources for studying their properties, especially their effects on biology. |
| Chemcyclopedia Plus | | An annual supplement to Chemical & Engineering News (C&EN). Provides users/purchasers of chemicals with trade names, packaging, special shipping requirements, potential applications, and CAS Registry Numbers. Chemicals are listed in categories. |
| ChemExpo | | News, stock reports, products, directories, classifieds, and profiles of commercially available chemical products; focus reports; |
| Chemical Abstracts Service (CAS) | | Provides pathways to published research in the world's journal and patent literature through tools such as SciFinder, SciFinder Scholar and STN. CAS databases provide access to over 25 million documents, 26 million chemical substances, and 56 million sequences. |
| ChemIDplus | | A free database of 350000 chemical compounds. Records consist of name, synonyms, CAS number, molecular formula, and direct links to biomedical resources. Included also over 100000 structures. Searchable by substructure with free Chime plugin. |
| CHEMnetBASE | | Online access to major chemical reference works from Chapman & Hall/CRC including Combined Chemical Dictionary (CCD), The Handbook of Chemistry & Physics, Polymers: A Property Database, Properties of Organic Compounds. |
| Chmoogle: Searching the World's Chemistry | | Free chemical structure search engine. Millions of public domain structures. Very fast substructure searching. Results link to data about these structures. Searching for chemical names and synonyms. Finding commercial sources of chemical compounds from vendors worldwide. |
| CML Reference Collection | | Commercial database of more than 120,000 3D molecular structures expressed in CML (Chemical Markup Language) format. |
| Derwent Information | | Chemical, pharmaceutical and biotechnological databases, covering patents, journals and conferences. |
| DETHERM Thermophysical Properties | | Thermophysical properties of pure substances and mixtures. Phase equilibrium data, caloric data, critical data, transport properties, electrolyte data. Data sets with descriptors and bibliographic references. |
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