Overview
EN ISO 8502-3:2017 (ISO 8502-3:2017) specifies a simple, qualitative method for the assessment of dust on steel surfaces prepared for painting using a pressure-sensitive tape. The procedure produces pictorial ratings for the average quantity of dust and descriptive classes for the average particle size, enabling use as a pass/fail inspection or to create a permanent record of surface dust contamination prior to coating application.
Key topics and requirements
- Method principle: press a pressure-sensitive adhesive tape onto the steel surface, remove it, mount the tape on a contrasting display board and visually assess the deposited dust.
- Assessment outputs:
- Pictorial ratings for average dust quantity (qualitative scale).
- Descriptive classes for average dust particle size.
- Scope and applicability:
- Intended for dust remaining on cleaned steel substrates prepared for painting.
- The document states the method is useful for steel surfaces corresponding to rust grades A, B or C (per ISO 8501‑1).
- Materials and references:
- Uses pressure-sensitive tapes conforming to relevant test methods (see IEC 60454-2).
- Terminology aligned with ISO 4618.
- Documentation: test reports should record location, date/time, number of tests, pictorial rating/class and any reference specimens used. Annex A provides guidance on a spring-loaded roller for tape application.
Practical applications
- Quality control and inspection on blasting, fabrication and construction sites to check residual dust prior to painting.
- Coating acceptance testing for contractors, inspectors and owners (shipbuilding, offshore structures, bridges, pipelines, industrial steelwork).
- Comparative evaluations of cleaning methods or environmental contamination by using standard specimens to benchmark results.
- Useful where dust can affect coating adhesion or trap moisture and salts that promote corrosion.
Who uses this standard
- Coating inspectors and QA/QC teams
- Surface preparation engineers and specifiers
- Paint manufacturers and applicators
- Asset owners and project managers responsible for protective coatings
Related standards
- ISO 8501‑1 - rust grades and preparation grades (visual reference)
- ISO 4618 - paints and varnishes terms and definitions
- IEC 60454‑2 - pressure-sensitive adhesive tape test methods
- Other parts of ISO 8502 (chloride, salt and contamination tests) and ISO 8503/8504 series on surface roughness and preparation
Keywords: ISO 8502-3, EN ISO 8502-3:2017, pressure-sensitive tape method, dust assessment, surface cleanliness, steel substrate preparation, blast-cleaned steel, coating inspection, quality control.
