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⚠️ The official ISO 8502-3 chart is a copyrighted document. While summary PDFs are available from equipment manufacturers (like Elcometer or TQC Sheen), the actual visual comparison must be done using high-quality printed masters to ensure accuracy. To help you get exactly what you need, let me know:

A very small quantity of fine dust particles distributed evenly.

Very high density; the tape surface is nearly completely covered by dust. 2. Dust Size Class (1 to 5)

To execute a compliant test, standard kits like the or the DeFelsko PosiTest DT are used.

ISO 8502-3 is a critical part of the ISO 8502 series, which focuses on tests for assessing surface cleanliness. Specifically, Part 3 describes the "pressure-sensitive tape method" for evaluating residual dust on steel surfaces that have been cleaned and prepared for painting. Dust contamination is a major threat to coating integrity—it acts as a weak boundary layer, preventing proper adhesion and leading to premature coating failure, such as flaking or blistering. By providing a standardized method for sampling and rating dust, ISO 8502-3 allows inspectors and contractors to make objective, pass/fail decisions about surface readiness, ensuring the performance of subsequent paint systems.

ISO 8502-3 Dust Level Chart: The Complete Guide to Surface Cleanliness

What is the of the asset (e.g., marine immersion, bridge structural steel, or internal tank lining)?

A: ISO 8502-3 is for dust contamination, while ISO 8502-6 is for the Bresle method (soluble salts).

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Pull out and throw away the first three turns of the pressure-sensitive adhesive tape to eliminate any shelf contamination.