Standards & Specifications

Accurate, consistent standards are essential to the safe and effective use of copper and copper alloy products.

The Copper Development Association provides access to a wide range of standards and specifications to support engineers, manufacturers, specifiers, and end users in selecting the right materials for their applications.

This section includes comprehensive information on ASTM and UNS alloy designations, international standards, and cross-reference tools that help ensure material compatibility and performance. Whether you’re specifying a copper alloy for plumbing, electrical systems, architecture, or manufacturing, these resources provide the technical clarity needed to meet industry requirements.

Explore the data, definitions, and designations that keep copper applications running smoothly and to spec.

UNS Standard Designation

The Unified Numbering System (UNS) is the accepted alloy designation system in North America for wrought and cast copper and copper alloy products. Developed collaboratively by ASTM International and SAE International, the UNS assigns a unique five-digit code prefixed with 'C' to each copper alloy, facilitating clear and consistent identification across the industry. For instance, the traditional alloy 377 (forging brass) is designated as C37700 in the UNS system.

In this system, numbers from C10000 through C79999 denote wrought alloys, while C80000 through C99999 represent cast alloys. These designations encompass various families of copper and copper alloys, including high copper alloys, brasses, bronzes, and copper-nickels. The UNS system streamlines alloy classification, ensuring compatibility and standardization in manufacturing, engineering, and procurement processes.

Explore the UNS designations to understand the composition and classification of copper alloys, aiding in material selection and specification for diverse applications.

Cross Specifications for Copper & Copper Alloys

The Properties of Wrought and Cast Copper Alloys tool offers a streamlined way to explore the comprehensive database of wrought and cast copper alloys. Users can select specific alloys and view detailed information on various properties, including chemical composition, mechanical and physical properties, casting characteristics, fabrication practices, thermal properties, typical uses, applicable specifications, and corrosion resistance. This resource is invaluable for engineers, designers, and manufacturers seeking to identify the right copper alloy for their specific applications.

For more advanced search capabilities, including filtering by multiple properties and criteria, users can utilize the Advanced Faceted Search interface. Additionally, the Copper Development Association offers an API for those interested in integrating alloy properties and supplier data into their own websites or applications.

European Numbering System for Non-Ferrous Metals

The European Numbering System (ENS) provides a standardized method for identifying copper and copper alloys across Europe. Developed by the European Committee for Standardization (CEN), this system assigns unique alphanumeric codes to materials, ensuring consistency and clarity in material specifications throughout European countries.

Each designation begins with a 'C' to denote copper, followed by a letter indicating the product form (e.g., 'W' for wrought products, 'B' for ingots, 'C' for castings, and 'M' for master alloys), a three-digit number representing the specific alloy, and a final letter signifying the material group. For example, CuZn37 is designated as CW508L in the ENS.

This system facilitates clear communication among manufacturers, suppliers, and end-users, reducing confusion caused by varying national standards. By adopting the ENS, industries can ensure accurate material selection and compliance with European standards.

Explore the ENS designations to better understand the classification and properties of copper and copper alloys used in European markets.

List of Inactive Alloys