Comprehensive list of CAS Numbers, Page 1

Chemical CAS Registry Numbers are simple and regular, convenient for database searches. They offer a reliable, common and international link to every specific substance across the various nomenclatures and disciplines used by branches of science, industry, and regulatory bodies. Almost all molecule databases today allow searching by CAS Registry Number.

Below list of CAS Numbers contains a wide variety of substances, including the world's largest collection of:

  • Organic compounds
  • Inorganic compounds
  • Metals
  • Alloys
  • Minerals
  • Coordination compounds
  • Organometallics
  • Elements
  • Isotopes
  • Nuclear particles
  • Proteins and nucleic acids
  • Polymers
  • Nonstructurable materials (UVCBs)

CAS Registry Number, however, is unique and specific to only one substance regardless of how many other ways the substance can be described.