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CAS REGISTRY®, the CAS substance collection, is the premier source relied upon by scientists and regulators worldwide for accurate information on chemical substances.

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Quickly confirm chemical names, CAS Registry Numbers®, structures or basic physical properties by searching compounds of general interest or leveraging an API connection.

Sep 9, 2025 · With these changes, by April 2026, all CAS exams except Exam 6I* will be offered at least twice a year, providing candidates with greater flexibility and more opportunities to …

CAS provides solutions and services that help empower scientific discoveries. Learn how CAS can facilitate your research and drive innovation.

Feb 18, 2025 · The Casualty Actuarial Society (CAS) is excited to announce the launch of the CAS Portal, our new and improved e-commerce platform and user database.

As part of basic education, the CAS requires Validation by Educational Experience (VEE) topics. Validation of these topics is required in addition to the preliminary education exams listed. …

Jan 7, 2026 · CAS builds the world’s largest collection of human-curated scientific knowledge covering over 150 years of published science. Our tools are designed to address the …