Maintain relative humidity below 85% and ensure the substrate temperature is at least 3°C above the dew point to prevent moisture from trapping dust onto the steel profile.
The quantity rating relies on a visual comparison between the used test tape and pictorial reference images. The ratings are derived from ISO 4628-1 and run on a scale from 0 to 5:
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Large, distinct grains easily spotted without magnification. Particles larger than Massive particulate matter or debris. iso 85023 dust level chart pdf updated
Cut a piece of tape approximately 200 mm long, press it firmly onto the prepared steel surface, and use a standardized spring-loaded roller (like the Elcometer 145 ) to apply a uniform force between 39.2 N and 49.0 N.
For quality control inspectors, asset owners, and protective coating professionals, using an updated is critical to verifying that a substrate meets strict industrial cleanliness criteria before any primer or paint is applied. What is the ISO 8502-3 Dust Tape Test?
The standard categorizes dust contamination using two distinct metrics: (how much dust is present) and Size (how large the particles are). A complete specification will always state both limits (e.g., "Max Quantity 2, Max Size Class 3"). 1. Dust Quantity Ratings (0 to 5) Maintain relative humidity below 85% and ensure the
The chart displays actual-scale photographic examples of dust particles on a white background. For each quantity class, the chart shows typical particle sizes:
Ultimate Guide to ISO 8502-3 Dust Level Chart (2026 Updated)
Surface preparation is widely regarded as the most critical stage in any industrial coating project. While visible contaminants like rust and mill scale are often the primary focus, microscopic "invisible" threats like residual dust can be equally devastating to a coating's lifespan. ISO 8502-3 provides the standardized framework necessary to detect and quantify these particles using a simple yet effective pressure-sensitive tape method. ISO - International Organization for Standardization The Impact of Dust on Coating Integrity This link or copies made by others cannot be deleted
There was a pause. “That’s why I called,” Jan said. “The client’s quality manager just downloaded the new PDF. He’s asking why our certificate doesn’t match the current standard.”
The complete, authoritative standard can be purchased via ISO or ANSI.