Question 1

What is CAS REGISTRY?

Accepted Answer

CAS REGISTRY is the most authoritative collection of disclosed chemical substance information. It covers substances identified in scientific literature from 1957 to the present, with additional substances going back to the early 1900s. It is updated daily with thousands of new substances.

Question 2

How are CAS Registry Numbers assigned?

Accepted Answer

A CAS Registry Number is assigned to a substance when it enters the CAS REGISTRY database. New substances are added when they are identified in literature being indexed for the CAS Content Collection or when an entity requests a CAS Registry Number for their novel substance from CAS Registry Services. Numbers are assigned in sequential order to unique, new substances identified by CAS scientists.

Question 3

What kinds of compounds does the CAS REGISTRY contain?

Accepted Answer

CAS REGISTRY contains a wide variety of substances, including the world's largest collection of organic and inorganic compounds, metals and alloys, minerals, coordination compounds and organometallics, elements, isotopes, and nuclear particles, proteins and nucleic acids, polymers, and non-structurable materials and those of unknown or variable composition and biologics (UVCBs).

Question 4

Why have CAS Registry Numbers become the world standard?

Accepted Answer

Since CAS Registry Numbers are not dependent upon any system of chemical nomenclature, they can provide a reliable common link between the various nomenclatures used to describe substances and serve as an international resource for chemical substance identifiers used by scientists, industry, and regulatory bodies.

Question 5

Why do regulatory agencies rely on CAS Registry Numbers?

Accepted Answer

A CAS Registry Number is unique to one substance, regardless of how many other ways it can be described. Government and regulatory agencies have found CAS Registry Numbers ideal for keeping track of substances because they are unique, validated quickly and reliably, and internationally recognized.

Question 6

Where can I find CAS Registry Numbers?

Accepted Answer

CAS Registry Numbers are found in CAS solutions like CAS SciFinder and CAS STNext, CAS publications, governmental regulatory agency commercial chemical inventories, selected Elsevier databases, handbooks, guides, technical reports, other printed reference works, and chemical catalogs. For common substances, you can use CAS Common Chemistry at commonchemistry.cas.org.

Question 7

How can I obtain or request the assignment of a CAS Registry Number?

Accepted Answer

CAS Registry Services offers several options for confirming and assigning CAS Registry Numbers and obtaining CA Index Names. There are fees associated with these services. You can submit a request through the CAS Registry Lookup order form.

Question 8

Why is it important to come to CAS for CAS Registry Numbers?

Accepted Answer

While printed publications may contain outdated information, the CAS REGISTRY database is updated daily, making it the best source for accurate CAS Registry Number information. CAS is the source and final authority for CAS Registry Numbers. Other resources may have associated an incorrect CAS Registry Number with a compound.

Question 9

What is the CAS RN Verified Partner Program?

Accepted Answer

A CAS Registry Number license is required anytime an organization will publish CAS Registry Numbers to the public or use them to support features of a platform that is publicly or commercially available.

Question 10

How is CAS RN pronounced?

Accepted Answer

While many in the scientific community pronounce it 'cazern,' CAS RN is pronounced like an acronym, meaning each letter is pronounced: C-A-S-R-N.

Question 11

What is a CA Index Name, and how are they related to CAS Registry Numbers?

Accepted Answer

A CA Index Name is the substance name displayed in document findings and is often the name retrieved when a CAS RN is searched in CAS REGISTRY. CAS leverages an extensive rule set to generate unique structure-based names for substances. A substance may have additional names, such as trivial names and trade names, that are also available in CAS solutions.

CAS REGISTRY®

CAS Registry Number®란 무엇인가요?

CAS Registry Number(CAS RN®)가 사용되는 이유는 무엇인가요?

알려진 물질의 CAS Registry Numbers 또는 CA 색인명을 찾고 계신가요?

CAS REGISTRY와 CAS Registry Number의 차이는 무엇인가요?

CAS Registry Number는 어떻게 표시되나요?

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