ISO 209:2024/Amd 1:2026

Overview

ISO 209:2024/Amd 1 is an official amendment to the international standard governing the chemical composition of wrought aluminium and aluminium alloys. Prepared by ISO/TC 79/SC 6 and published in 2025, this amendment refines the alloy designation system to ensure greater clarity and global harmonization. It aligns with internationally recognized alloy designation practices, such as those established by the Aluminium Association’s "Teal sheets," and acknowledges equivalent naming conventions used in other regional and international standards.

This amendment supports industries engaged in the production, processing, and application of wrought aluminium alloys by providing consistent and updated chemical composition definitions. It facilitates interoperability between different designation systems and enhances traceability in aluminium alloy identification globally.

Key Topics

• Updated Alloy Designation
  The amendment replaces the initial sentence in Clause 4 to mandate alloy designations be based on internationally accepted recommendations from the Aluminium Association’s system (Teal sheets).

• Prefix Recommendations for Alloy Identifications
  To avoid confusion with similar four-digit designation systems used by other materials, the amendment recommends introducing prefixes such as:

  • AW-XXXX in European EN standards
  • A9XXXX in the Unified Numbering System (UNS)
  • AXXXX in Japanese Industrial Standards (JIS)
    These prefixes do not alter the chemical composition but improve cross-standard consistency.

• Harmonized Table Headings
  Changes in Table 1 and Annex A.1 update column headings from "Alloy" to "Alloy designation", emphasizing standardized terminology.

• Correspondence Annex
  Annex A provides a detailed correspondence between alloy designations and their applicable product forms, supporting better material specification and selection.

Applications

• Manufacturing and Quality Control
  Aluminium producers and fabricators use this standard to verify and document the chemical makeup of wrought aluminium alloys, ensuring compliance with international specifications.

• Product Design and Engineering
  Engineers rely on precise alloy chemical composition data for material selection, enhancing the mechanical properties and performance of aluminium components.

• Global Trade and Standardization
  The amendment facilitates global trade by harmonizing alloy designations, helping importers, exporters, and regulators to clearly identify alloy types and compositions without ambiguity.

• Certification and Conformity Assessment
  Laboratories performing chemical analysis and certification testing refer to this updated standard to align test results and reports with accepted international frameworks.

Related Standards

• ISO 209:2024 - Base standard for wrought aluminium and aluminium alloys chemical composition
• Aluminium Association Teal Sheets - International Alloy Designation and Chemical Composition Limits System
• European EN Standards - For aluminium alloys designation and related product standards
• Unified Numbering System (UNS) - Standardized numerical designation system widely used in North America
• Japanese Industrial Standards (JIS) - National standards including aluminium alloy designations
• ISO/IEC Directives, Part 1 and 2 - Governing rules and editorial principles for ISO standards development

For detailed alloy composition tables and the full amendment text, consult the official ISO publication ISO 209:2024/Amd 1. This ensures access to the latest internationally recognized definitions and terminologies vital for aluminium alloy application, specification, and regulatory compliance.