Assessment of chemicals

CAS Number (Chemical Abstract Service index number)


A CAS registry number is a unique numerical identifier for for chemical compounds, polymers, biological sequences, mixtures and alloys and does not have any chemical significance.

For information on CAS registry numbers, go to the "Check Digit Verification of CAS Registry Numbers" page of the CAS, a division of the American Chemical Society.

A CAS Registry Number is a Registered Trademark of the American Chemical Society.


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