Overview
EN ISO 8504-2:2019 – Preparation of steel substrates before application of paints and related products - Part 2: Abrasive blast-cleaning (ISO 8504-2:2019) is the CEN/ISO standard that specifies methods, equipment and procedures for abrasive blast-cleaning of steel prior to coating. It explains the effectiveness and appropriate fields of application for each blasting method and provides guidance on abrasive selection, health and safety considerations, and how to assess the resulting blast-cleaned surface. The methods are primarily intended for hot-rolled steel (to remove mill scale, rust and similar deposits) but can also be used on sufficiently thick cold-rolled steel.
Key Topics
- Abrasives: materials and types, general technical requirements, health & safety aspects, and selection considerations for different surface conditions.
- Abrasive blast-cleaning methods:
- Dry methods: centrifugal, compressed-air, vacuum/suction-head systems.
- Wet methods: moisture-injection, compressed-air wet blasting, slurry blasting, pressurized-liquid blasting.
- Equipment and procedure: requirements for blasting equipment and step-by-step guidance covering preparation before blast-cleaning, the blasting operation itself, and post-blast actions.
- Assessment: guidance on evaluating the blast-cleaned surface to ensure it meets the intended cleanliness and surface profile for subsequent coating application.
- Scope limits: applicability to new and corroded steel, and to uncoated or previously coated steel; note that the standard does not prescribe specific coating systems.
Applications
EN ISO 8504-2 is used to:
- Prepare steel surfaces before application of paints and protective coatings.
- Remove mill scale, rust, old coatings or contaminants to obtain suitable adhesion and surface profile.
- Match surface-preparation methods to required production rates, accessibility, and final coating performance.
Typical sectors: structural steelwork, bridges, shipbuilding, oil & gas, heavy industry, and infrastructure maintenance where durable protective coatings are critical.
Who Should Use This Standard
- Coating specifiers and design engineers selecting surface preparation methods.
- Surface-preparation contractors and blast cleaning operators.
- Quality inspectors and asset owners verifying pre-coating conditions.
- Health & safety and environmental managers evaluating abrasive selection and containment.
Related Standards
- ISO 8501 series - Visual assessment of surface cleanliness
- ISO 8502 series - Tests for assessment of surface cleanliness
- ISO 8503 series - Surface roughness characteristics of blast-cleaned steel
- ISO 11124 / ISO 11126 - Specifications for metallic and non-metallic abrasives
- ISO 4628-3 - Assessment of degree of rusting
Keywords: EN ISO 8504-2:2019, abrasive blast-cleaning, surface preparation, steel substrates, mill scale removal, blast-cleaned surface, coating preparation.
