In the vast and complex world of chemical compounds, precise identification is paramount. Whether you are a researcher, a procurement manager, or a formulation scientist, knowing exactly which chemical you are dealing with is the first step towards successful application. This is where the Chemical Abstracts Service (CAS) Registry Number, commonly known as the CAS number, plays an indispensable role. It serves as a unique, universally recognized identifier for chemical substances.

What is a CAS Number?

A CAS number is a unique numerical identifier assigned by the Chemical Abstracts Service, a division of the American Chemical Society, to every chemical substance described in the open scientific literature. It consists of up to ten digits, separated by hyphens into three parts. The first part has up to six digits, the second part has up to two digits, and the third part is a single check digit. For example, 2',3'-Di-O-acetyl-5'-deoxy-5-fluorocytidine has the CAS number 161599-46-8.

Why are CAS Numbers Crucial for Sourcing?

The CAS number system offers several critical benefits, particularly in the context of chemical sourcing:

• Unambiguous Identification: Different names, synonyms, and even trade names can refer to the same chemical compound. The CAS number eliminates this ambiguity, ensuring that everyone is referring to the exact same substance. This is particularly important when purchasing specialized chemicals like pharmaceutical intermediates from global suppliers.
• Accurate Database Searches: Most chemical databases, supplier catalogs, and regulatory documents use CAS numbers for indexing and searching. This allows for quick and precise retrieval of information regarding properties, safety data, and availability.
• International Standardization: The CAS number system is recognized globally, facilitating seamless communication and transactions across different countries and regulatory bodies. When you search for a specific chemical like a pharmaceutical intermediate, using its CAS number ensures you are looking at the correct product.
• Ensuring Quality and Safety: When you specify a CAS number to a supplier, such as NINGBO INNO PHARMCHEM CO.,LTD., you are guaranteed to receive the precise chemical you require. This helps prevent accidental use of incorrect or potentially hazardous substances, ensuring the safety and integrity of your research or production processes. For example, when ordering 2',3'-Di-O-acetyl-5'-deoxy-5-fluorocytidine (CAS 161599-46-8), the CAS number ensures you get that specific fluorinated cytidine derivative and not a similar-looking but functionally different compound.

Using CAS Numbers Effectively

When sourcing chemicals, always include the CAS number in your inquiries. This will help your supplier confirm your request accurately and provide the correct product. For instance, when seeking to buy pharmaceutical intermediates, specifying the CAS number is as important as specifying the desired purity and quantity. It streamlines the procurement process and minimizes the risk of errors. Trustworthy chemical suppliers will always use CAS numbers to identify their products, ensuring clarity and reliability for their customers worldwide.