Very heavy dust level; the tape surface is nearly or completely covered by dust. 2. Dust Size Class (Class 1 to 5)
In the protective coatings industry, the cleanliness of a steel surface before painting is paramount to its longevity and performance. Surface contaminants, particularly dust generated during abrasive blasting, can significantly hinder coating adhesion, leading to premature failure, blistering, and corrosion.
Accurate metric indicators for Size Classes 1 through 5. iso 85023 dust level chart pdf updated
Users often upload scanned versions of the inspector's chart.
“Better than a coating failure five years from now,” Marta replied. “The chart doesn’t lie, Jan. It’s been updated for a reason. Someone, somewhere, had a delamination because of old Size 3 dust. We’re not going to be that someone.” Very heavy dust level; the tape surface is
Compare the tape to the ISO 8502-3 visual chart under good lighting conditions. Record both the Quantity Rating and the Size Class (e.g., "Dust Level: Rating 2, Class 3"). Why You Need the Updated ISO 8502-3 PDF Chart
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. “Better than a coating failure five years from
You can download the ISO 8502-3:2017 PDF from the following sources:
This class defines the physical size of the dominant dust particles on the tape.
The standard uses a scale from to denote the density of particles: