ISO 752:2004

Overview

ISO 752:2004 is an international standard published by the International Organization for Standardization (ISO) that specifies the classifications, chemical compositions, markings, and other requirements for primary zinc ingots. This standard is exclusively applicable to primary zinc-zinc produced directly from ore or other zinc-containing materials via distillation, chemical reduction, or electrolytic processes-and does not cover secondary zinc produced by remelting.

This second edition of ISO 752 supersedes the 1981 edition and aligns with global trade practices by defining five recognized zinc grades, their chemical content, and marking conventions. It also provides a cross-reference table linking ISO zinc grades to related standards used worldwide.

Key Topics

• Zinc Grades and Chemical Composition
  ISO 752:2004 classifies primary zinc into five commercial grades (ZN-1 to ZN-5), each with specific maximum limits for impurities such as lead (Pb), iron (Fe), cadmium (Cd), aluminum (Al), copper (Cu), and tin (Sn). Minimum zinc content ranges from 98.5% to 99.995% by mass.

• Marking and Identification
  Zinc ingots must be clearly marked or labeled with producer identification, zinc grade (either by designation or color code), lot or casting reference, and the ingot or bundle mass to ensure traceability.

• Sampling and Chemical Analysis
  Sampling procedures conform to ISO 20081, ensuring representative testing for chemical composition verification. Chemical analysis methods include spectrometric and wet chemical techniques in line with international guidelines such as ASTM B6, EN 1179, JIS H2107, and others.

• Order Information and Documentation
  Buyers should specify grade designation, total and nominal masses, ingot form, and certification requirements upon ordering. Suppliers provide inspection documents, either a certificate of analysis or a conformity declaration, to validate compliance with ordered specifications.

• Terminology and Ingot Types
  The standard defines key terms including ingots, primary zinc, continuous and discontinuous castings, lots, blocks, piles of ingots, jumbos, and smaller plaques, which impact handling and usage.

Applications

ISO 752:2004 is essential for industries involved in the manufacturing, supply, and use of primary zinc ingots, including:

• Metal refining and casting industries where precise zinc composition control is necessary.
• Chemical manufacturing, for processes requiring high-purity zinc.
• Galvanizing plants that depend on consistent zinc quality for corrosion-resistant coatings.
• Alloy production and metal fabrication utilizing zinc and zinc alloys for diverse industrial applications.
• International trade and procurement, ensuring uniform global standards for zinc ingots and facilitating quality assurance.

Adhering to ISO 752 helps manufacturers and buyers maintain product quality, consistency, and compliance with international trade requirements.

Related Standards

ISO 752:2004 works in conjunction with several international and regional standards, ensuring global interoperability and equivalency for zinc ingots:

• ISO 20081 - Zinc and zinc alloy sampling methods, crucial for compositional verification.
• EN 1179 - European standard for primary zinc specifications.
• ASTM B6 - American specification for zinc metal and ingots.
• JIS H2107 - Japanese Industrial Standard for zinc metal.
• KS D 2351 - Korean standard for zinc metal.
• AS 1242 - Australian standard concerning zinc ingots.

These references facilitate the use of ISO 752 in international supply chains by defining equivalent grades and analysis methods, thus supporting standardization in zinc commerce.

Keywords: ISO 752:2004, zinc ingots, primary zinc, zinc grades, chemical composition, ingot marking, zinc standard, zinc purity, metal industry standards, international zinc standards, zinc alloy, zinc certification, zinc sampling, zinc analysis methods, zinc trade standards.