ISO 11126-3:2018

Overview

ISO 11126-3:2018 is an international standard published by ISO that specifies the requirements for copper refinery slag abrasives used in blast-cleaning processes. This standard focuses on the preparation of steel substrates prior to the application of paints and related protective coatings. It establishes precise criteria including particle size distribution, apparent density, Mohs hardness, moisture content, conductivity of aqueous extracts, and water-soluble chloride content specifically for copper refinery slag supplied in its new condition.

Designed primarily to meet the demands of steel surface preparation, the properties laid out in ISO 11126-3:2018 are also generally applicable for preparing other material surfaces using abrasive blasting methods. This document complements other ISO standards such as ISO 8504-2, which details techniques for abrasive blast-cleaning.

Key Topics

• Copper Refinery Slag Abrasives
  This standard defines copper refinery slag as a synthetic mineral abrasive produced by wet granulation or air atomization from copper smelting slag. The abrasive is mainly composed of iron silicates and is supplied either as angular granules or rounded granules.

• Particle Size Distribution
  ISO 11126-3:2018 specifies strict particle size ranges along with limits on mass fractions for nominal size, sieve rejection, and dust content. Particle sizes typically range up to 3.15 mm, with controlled proportions of fines under 0.2 mm.

• Physical and Chemical Requirements
  Key properties assessed include:

  • Apparent density (3.3 to 3.9 kg/dm³)
  • Minimum Mohs hardness of 6
  • Maximum moisture content of 0.2% by mass
  • Maximum conductivity of aqueous extract at 250 µS/cm
  • Water-soluble chlorides content below 0.0025% by mass

• Quality Control and Testing
  The standard references various test methods outlined in parts of ISO 11127 for sampling, particle size analysis, density measurement, hardness evaluation, moisture determination, conductivity tests, and chloride assessment.

• Designation and Marking
  Copper refinery slag abrasives must be clearly identified by a standardized naming format including "Abrasif ISO 11126 N/CU" followed by particle shape (G for angular, S for rounded) and size range in millimeters, ensuring consistent communication across suppliers and users.

Applications

ISO 11126-3:2018 is essential for industries involved in:

• Steel Surface Preparation
  The standard supports achieving optimal surface profiles and cleanliness prior to painting or coating steel structures, enhancing adherence and durability of protective finishes.

• Marine and Offshore Sectors
  Blast-cleaning with copper refinery slag abrasives is favored in marine environments for its effective rust and scale removal while minimizing water-soluble chloride contamination.

• Infrastructure Maintenance
  Used in maintenance and refurbishment of bridges, pipelines, and storage tanks where abrasive blasting ensures long-lasting corrosion protection.

• Manufacturing and Fabrication
  Effective in preparing steel components for final coatings during manufacturing processes.

By adhering to ISO 11126-3:2018 requirements, organizations can ensure abrasive materials are consistent, safe, and suitable for high-quality surface treatment operations.

Related Standards

• ISO 11127 Series
  Provides comprehensive methods for testing non-metallic blast-cleaning abrasives, including sampling (Part 1), particle size analysis (Part 2), apparent density (Part 3), hardness testing (Part 4), moisture content (Part 5), aqueous extract conductivity (Part 6), and chloride content (Part 7).

• ISO 8504-2
  Describes abrasive blast-cleaning techniques used in steel surface preparation, complementing the application of abrasives specified in ISO 11126-3.

• ISO 11126 Other Parts
  Includes specifications for other non-metallic abrasives like chippings, foundry slag, and expanded mineral abrasives, providing a full suite of guidelines for various blast-cleaning materials.

Keywords: ISO 11126-3, copper refinery slag, blast-cleaning abrasives, steel surface preparation, abrasive blasting, particle size distribution, Mohs hardness, moisture content, conductive aqueous extract, water-soluble chlorides, non-metallic abrasives, ISO 11127, ISO 8504-2, surface preparation standards, paint substrate preparation, industrial surface treatment.