ISO 8502-3 is a specific component of the multi-part ISO 8502 standard, which outlines methods for the assessment of surface cleanliness. Specifically, Part 3 defines the for evaluating dust on blast-cleaned steel surfaces.
Press the tape firmly onto the prepared steel surface using a standardized roller or thumb pressure to capture surface dust.
Remove and discard the first three turns of the specialized adhesive tape to ensure the adhesive is fresh and uncontaminated.
Compare the tape sample against the pictorial reference chart to determine the dust rating. Understanding the Dust Rating Chart iso 85023 dust level chart pdf updated
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:
A piece of pressure-sensitive tape is applied to the prepared steel surface. Pressure is applied to ensure the tape makes full contact with the dust particles, which are then lifted off when the tape is removed.
: These descriptive classes categorize the average size of the dust particles. Class 0 : Particles not visible under 10x magnification. ISO 8502-3 is a specific component of the
The core of any ISO 8502-3 inspection is the visual comparison chart. When inspectors refer to an updated PDF chart, they are looking for the standardized graphic representations of dust particle density.
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This visual rating compares the density of dust particles on a test tape against pictorial references. Remove and discard the first three turns of
Particles visible with normal vision but mostly under 0.5 mm in diameter.
If the test results show a high dust quantity, the surface must be re-cleaned, often using clean and dry compressed air, and re-tested.
While quantity is the most common requirement in coating specifications, the size of the particles is also classified. ISO 8502-3 testing | Industrial Physics
Compare the dust density on the tape with the pictorial classes in the standard to determine the rating. Download Updated ISO 8502-3 Dust Level Chart PDF (2026)