CAS is the only organization in the world whose objective is to find, collect and organize all publicly disclosed substance information.

We build and maintain the world's largest collection of molecular substances, reactions, and related content that is vital to the work of researchers.

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Need fine chemicals for the lab?

From background investigation through process planning, CHEMCATS in SciFinder® is the solution for fine chemicals.

CAS REGISTRY has reached 100 million chemical substances

CAS Registry Numbers provide unique identifiers to access the exact chemical needed for research, safety and compliance.

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A Regulatory Solution for Those Who Manufacture, Import or Export Chemicals.

Latest Feature: PET Imaging

A look at recent patenting activity in PET Imaging.


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SciFinder provides access to CAS content and delivers the information they need to:

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STN - The Choice Of Patent Experts

Intellectual property professionals and patent examiners worldwide rely on STN for their scientific and technical information needs because STN delivers:

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No one else has more...

A global team of scientists is continually adding substance information from the world's disclosed chemistry to the CAS REGISTRYSM, the gold standard for chemical substance information.


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