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[Chemical Knowledge]：CAS Number and CAS Login Number: Difference and Application

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CAS number and CAS registration number are two concepts commonly used in chemical identification and identification. Although they are both codes used to uniquely identify chemical substances, they have some differences in specific meanings and applications.

, let's first look at CAS number, CAS number (Chemical Abstracts Service Registry Number), also known as chemical CAS number, is a set of identification system established by the American Chemical Abstracts Service to identify compounds and polymers. CAS numbers are usually composed of consecutive numbers without specific rules and patterns. The most common case is that a CAS number corresponds to a chemical substance, which also makes the CAS number a unique identification. CAS numbers are widely used worldwide for the identification, retrieval and identification of chemicals. The CAS number of a chemical can be found in relevant databases, such as the CAS database of the Chemical Abstracts Service of the United States, and some international chemical databases. Through the CAS number, we can accurately and quickly find the relevant information of a chemical substance, such as name, structure, physical and chemical properties, etc.

Next, let's talk about CAS registration number, CAS registration number (Chemical Substance Identifier), which is a new type of chemical identification code introduced by the European Union in REACH(Registration, Evaluation, Authorization and Restriction of Chemicals) regulations. The CAS registration number consists of two parts. The first part is the EC number (European Community Number), which consists of "EC" and an eight-digit number, which is used to identify EU-registered chemicals. The second part is a 6-digit number that identifies the order of registration of chemicals under the REACH regulation. The CAS registration number is used in the REACH regulation to uniquely identify chemicals and requires that chemicals sold on the European market must have a CAS registration number. Compared with CAS number, the coding rules of CAS registration number are more strict, orderly and legally binding. In the European field, CAS registration numbers have become an important tool for the registration and management of chemicals, and play an important role in the production, sale and use of chemicals.

To sum up, CAS number and CAS registration number are the identification codes of chemicals, and they have important application value in different fields. Whether it is the search and identification of chemicals on a global scale, or the registration and management of chemicals in Europe, CAS numbers and CAS registration numbers provide strong support for the safe use and management of chemicals. It is worth mentioning that with the development of globalization and information technology, the application scope of CAS number and CAS registration number will gradually expand, and the standardization and standardization of chemical identification and identification will also be more perfect, laying a solid foundation for the sustainable development of the chemical industry.

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