ISO 11126-7:2018

Overview

ISO 11126-7:2018 specifies requirements for fused aluminium oxide non‑metallic blast‑cleaning abrasives supplied in the new condition for surface preparation. It is part of the ISO 11126 series addressing preparation of steel substrates before application of paints and related products. The standard defines material types, particle‑size ranges, physical and chemical property limits, marking and supplier information needed for consistent blast‑cleaning abrasives used in surface preparation.

Key Topics and Requirements

• Abrasive types: Two types are defined:
  • Type A - brown corundum (typically ≥94% Al2O3, with up to ~4% TiO2).
  • Type WA - whitish corundum (≥99% Al2O3).
• Designation: Format example - “Abrasive ISO 11126 N/FA‑A/G 0,85‑2,00” (non‑metallic fused aluminium oxide, type A, grit shape, particle size range).
• Particle sizes: Nominal ranges are specified (examples: 0.045–0.180 mm, 0.125–0.300 mm, 0.212–0.500 mm, up to 1.18–2.80 mm). Exact distributions and sieve limits are given in the standard.
• Physical properties:
  • Apparent density: approximately 3.9 to 4.0 kg/dm³ (detailed in ISO 11127‑3).
  • Mohs hardness: minimum 6 (see ISO 11127‑4).
  • Moisture: maximum 0.2% mass fraction (ISO 11127‑5).
• Chemical/contaminant limits:
  • Conductivity of aqueous extract: max 250 µS/cm (ISO 11127‑6).
  • Water‑soluble chlorides: max 0.002% mass fraction (ISO 11127‑7).
• General requirements: No free silica; material must not absorb water (surface wetting only); free from corrosive or adhesion‑impairing contaminants.
• Sampling and testing: Sampling and test methods are referenced to the ISO 11127 test‑method parts.

Applications

ISO 11126‑7 is intended mainly for preparation of steel substrates by abrasive blast‑cleaning before painting or coating. The specified properties also make fused aluminium oxide abrasives suitable for preparing other materials and components where controlled abrasive performance is required - for example, industrial fabrication, marine and offshore structures, and heavy‑duty corrosion protection projects.

Who uses this standard

• Abrasive manufacturers and suppliers (product specification and marking)
• Coating specifiers and asset owners (procurement and compliance)
• Surface‑preparation contractors and blasting operators (selection of abrasive grade)
• QA/QC laboratories and inspectors (testing and acceptance of new abrasives)

Related Standards

• ISO 11126 series (other non‑metallic abrasives)
• ISO 11127‑1 to ‑7 (sampling and test methods for abrasives)
• ISO 8504‑2 (abrasive blast‑cleaning methods)
• ISO 8486‑1 (bonded abrasive grain size equivalence referenced in Annex A)

Keywords: ISO 11126‑7, fused aluminium oxide, blast‑cleaning abrasives, surface preparation, particle size, apparent density, Mohs hardness, water‑soluble chlorides.