Understanding CAS Registry Number: a Key Identifier for Chemical Substances

What Is CAS Registry Number

The Chemical Abstracts Service (CAS) database, maintained by the American Chemical Society (ACS), serves as a comprehensive index of chemical substances documented in scientific literature and patents since 1957. Each registered chemical substance is assigned a unique CAS Registry Number (CAS RN), making it an essential identifier widely used in regulatory compliance, trade, and research.

Importance of CAS Registry Numbers in Regulatory Compliance

CAS numbers are critical in the global chemical industry as they provide a standardized way to identify substances across different regulatory frameworks. Many regulatory and trade processes require CAS numbers, including:

• Customs Declarations: Ensuring accurate classification and compliance with import/export regulations.
• Chemical Registration Programs: Required in global compliance schemes such as EU REACH, China’s New Chemical Substance Notification (MEE Order No. 12), and U.S. TSCA Inventory Listing.
• International Chemical Trade: Facilitating precise identification of chemicals in cross-border transactions.

When Is a CAS Number Required or Searched?

While many common substances already have CAS numbers available in public databases, new or patented substances may require an official search or application through the CAS Registry. Relevant companies or researchers dealing with proprietary chemicals, novel compounds, or regulatory submissions often need to apply for a CAS number to ensure proper documentation and classification.

Types of Substances Eligible for CAS Number Registration

The CAS system covers a wide range of chemical substances, including:

• Organic and Inorganic Compounds
• Metals and Minerals
• Organometallic Compounds
• Polymers and Biopolymers
• Isotopes and Nucleotides
• Alloys and Coordination Compounds
• UVCB Substances (Unknown or Variable Composition, Complex Reaction Products, and Biological Materials)

Data Privacy in CAS Applications

Confidentiality is a crucial aspect of CAS applications. The CAS Registry will not disclose private information such as company details, addresses, or product-related data without prior authorization. The American Chemical Society (ACS) ensures strict data protection, preventing any third party from accessing proprietary information.

REACH24H’s CAS Registration and Search Services

Navigating CAS registration can be complicated, especially for new substances. Our expert compliance team provides a range of services to assist relevant companies in obtaining or verifying CAS numbers efficiently:

• Chemical Identity Verification: Ensuring substance information is accurate and meets regulatory standards.
• CAS Number Search & Application: Assisting in identifying existing CAS numbers or applying for new ones.
• Regulatory Compliance Support: Guiding relevant companies through chemical registration processes worldwide.
• Liaison with CAS Authorities: Managing communications and follow-ups to expedite the CAS number assignment process.

Conclusion

CAS numbers play an essential role in chemical substance identification, regulatory compliance, and international trade. Whether you need to search for an existing CAS number or apply for a new one, professional guidance can streamline the process and ensure compliance with global chemical regulations. Contact us today to simplify your CAS registration needs and ensure your chemical substances are properly documented and identified for international trade and regulatory purposes.