How to Search Chemicals by CAS Number
Published 2025-01-22
Exact-match CAS searching, synonym searching and molecular formula searching explained.
Searching by CAS Number should always be an exact match against a normalised value: strip whitespace, keep the hyphens and validate the check digit. When the CAS Number is unknown, a chemical name or synonym search is the next step, followed by molecular formula searching for structural exploration. A good chemical database indexes all three so a single search box can serve every workflow.