SIST EN ISO 11126-6:2018 PDF

Overview

SIST EN ISO 11126-6:2018 is an international standard specifying the requirements for non-metallic blast-cleaning abrasives produced from iron and steel slags. Part of the EN ISO 11126 series, this document focuses on the preparation of steel substrates prior to the application of paints and related coatings. It defines critical parameters such as particle size distribution, apparent density, Mohs hardness, moisture content, conductivity of aqueous extracts, and water-soluble chlorides for new (unused) slag abrasives intended for blast-cleaning operations.

This standard ensures that iron and steel slag abrasives meet consistent quality and safety criteria essential for effective surface preparation. It is applicable primarily to steel substrate preparation but can also be relevant to other materials prepared by blast-cleaning technology described in ISO 8504-2.

Key Topics

• Scope and Application Specifies requirements for blast-cleaning abrasives made from iron and steel slags in their new condition. Does not cover abrasives in use or after use.

• Material Composition Abrasives are vitreous amorphous materials mainly composed of calcium silicate with bonded silica content. Free crystalline silica must not exceed 1% mass fraction to ensure safety and performance.

• Particle Size and Shape Defines acceptable particle size ranges and shapes (grit or shot), catering to different surface preparation needs. Particle size distribution limits are specified to optimize cleaning efficiency and consistency.

• Physical and Chemical Properties

  • Apparent density: 2.6 to 3.9 kg/dm³
  • Mohs hardness: minimum 6 for durability and effective abrasive action
  • Moisture content: maximum 0.2% to maintain optimal blasting conditions
  • Conductivity of aqueous extract: limits impurities to a maximum of 250 µS/cm
  • Water-soluble chlorides: maximum 0.002% to reduce corrosion risk after blasting

• Designation and Identification Abrasives are designated by a standard coding system: Example – Abrasive ISO 11126 N/FE1/G 0,2-1, indicating non-metallic iron slag in grit form with a 0.2 to 1 mm particle range.

• Test Methods Testing and sampling methods for the abrasives referenced are covered in ISO 11127 parts 1 through 7. These include sampling, particle size distribution, density, hardness, moisture, conductivity, and chloride content.

• Safety Note Using blast-cleaning abrasives requires adequate safety measures and instructions due to the potential hazards of equipment and materials involved.

Applications

• Steel Surface Preparation Ensures optimal cleaning and surface profile development on steel prior to painting and coating applications, critical for achieving durable protective coatings.

• Blast-Cleaning Processes Suitable for use in various blast-cleaning equipment and processes, iron and steel slag abrasives are effective alternatives to metallic abrasives, offering controlled abrasive properties.

• Other Material Surfaces While developed for steel substrates, the properties specified also make these abrasives applicable to preparing other surface materials for coating, enhancing versatility.

• Corrosion Control Control of moisture and salts ensures minimized risk of corrosion post-blasting, improving the longevity of coatings applied thereafter.

Related Standards

• ISO 11126 Series A comprehensive set of parts addressing specifications for various non-metallic blast-cleaning abrasives:

  • Part 1: General principles and sampling
  • Part 2: Particle size distribution
  • Part 3: Apparent density measurement
  • Part 4: Hardness assessment
  • Part 5: Moisture determination
  • Part 6: Conductivity and contaminants testing
  • Part 7: Water-soluble chlorides determination

• ISO 8504-2 Describes blast-cleaning techniques relevant for substrate preparation across materials and industries.

Practical Value

Compliance with SIST EN ISO 11126-6:2018 guarantees the use of high-quality iron and steel slag abrasives with defined physical and chemical properties, enabling reliable, efficient surface preparation for protective coatings. The standard helps manufacturers, suppliers, and applicators maintain consistency and safety in blasting operations, ultimately improving coating performance and durability. Adherence also facilitates international trade by aligning product specifications across CEN member countries, ensuring interoperable quality benchmarks.

For professionals in surface treatment, coatings application, and industrial cleaning, this standard is a critical reference to select and evaluate blast-cleaning abrasives that meet technical and environmental requirements.