Search for Chemicals - ECHA
https://echa.europa.eu/search-for-chemicalsConsultations. ECHA organises consultations to get feedback from all interested parties and to gather the widest possible range of scientific information for the regulatory processes. REACH. Substances of very high concern identification. Draft recommendation for inclusion in the Authorisation List and consultation. Applications for authorisation.
CAS REGISTRY | CAS
https://www.cas.org/cas-data/cas-registryAuthoritative source for accurate chemical names, structures, and CAS Registry Numbers ®. 192 million organic and inorganic substances, including alloys, coordination compounds, minerals, mixtures, polymers, and salts disclosed in publications since the early 1800s. ~70 million protein and nucleic acid sequences
CAS Number Search - NIST
https://webbook.nist.gov/chemistry/cas-serSearch for Species Data by CAS Registry Number. Please follow the steps below to conduct your search: Enter a registry number (e.g., 74-82-8): Select the desired units for thermodynamic data: ... Redistribution rights for CAS registry numbers are reserved by the American Chemical Society.