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[Chemical Knowledge]：What does CAS mean?

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The CAS number is an internationally harmonized numbering system used to identify compounds. It is the "identity card" of a chemical, also known as the "chemical substance registration number". In the field of chemistry, the significance of CAS is very important. It not only helps to identify compounds, but also provides information on the properties, toxicity, and mode of action of compounds. This article will introduce the meaning and function of CAS in detail.

1. What is the CAS number?

CAS number is called "Chemical Abstracts Service Registry Number", that is, the registration number of Chemical Abstracts. It is a numbering system designed and managed independently by the Chemical Abstracts Service (CAS) of the American Chemical Society (ACS) to identify different chemical substances. The CAS number is composed of 10 Arabic numerals with unique properties, that is, each CAS number corresponds to only one chemical substance and will not be repeated.

2. The role of the CAS number

(1) Determine the identity of a chemical substance

The CAS number is a unique identifier for identifying a compound, which can help chemists accurately determine the identity of a chemical substance. It can distinguish between different isomers, isomers, isomers, etc. For microscopic amounts of chemicals, CAS numbers can avoid the trouble of repeated detection of the same compound and improve detection efficiency.

(2) provides compound properties and information

Each CAS number has its specific physicochemical properties and toxicity information, which can be provided to researchers for reference. In addition, the preparation method, thermodynamic data, toxicity data, etc. of chemical substances can be queried in the CAS database. In this way, researchers can obtain information more conveniently and speed up the research process.

(3) Ensure safety

In the production and use of chemicals, CAS numbers can also provide chemical safety information. For example, the CAS number can identify toxic substances and thus avoid ingestion or misuse. In addition, the CAS number can provide a risk assessment report that advises the user on how to handle the chemical correctly.

3. How do I find a CAS number?

a CAS number is very important to researchers, but how do I find a CAS number? Here are a few ways to find a CAS number.

(1) Chemical Abstracts

Chemical Abstracts is a database for finding chemical literature, which contains a large number of CAS numbers. Through chemical abstracts, you can understand the name of the compound, chemical structure and CAS number and other information. This is because CAS numbers are associated with chemical literature, and all records of chemical abstracts contain at least one CAS number. Therefore, chemical abstracts are the preferred way to find CAS numbers.

(2) Network Retrieval

Now, many chemical manufacturers and chemical databases provide online service to query the CAS number of chemical substances. The CAS number of the desired chemical can be quickly found by feeding the chemical substance name into the search engine. In addition, it can also be queried through a variety of chemical information search engines at home and abroad.

(3) Chemical packaging

For some standardized chemicals, CAS numbers are usually marked on the packaging. Researchers can look up the CAS number directly on the chemical packaging or related information. This method is simple and easy, and can quickly and accurately find the CAS number.