Does CAS offer any free services?
A.CAS offers Common Chemistry, a free web resource that contains CAS Registry Numbers for approximately 7,900 chemicals of widespread general public interest. Common Chemistry is helpful for those who know either a name or CAS Registry Number of a common chemical and want to pair both pieces of information. CAS has collaborated with Wikipedia in developing this resource and encourages you to use the Wikipedia link (when available) or other sources of general information on chemistry, to learn more about these chemicals.