Understanding the is critical for coating inspectors and surface preparation teams to ensure proper adhesion and prevent premature corrosion. Core Components of the ISO 8502-3 Chart
| | Description | Particle Size | | :--- | :--- | :--- | | 0 | Particles not visible, even under 10x magnification | < 50µm (very fine) | | 1 | Visible under 10x magnification only, not to the naked eye | < 50µm (fine) | | 2 | Just visible to the naked eye (with normal/corrected vision) | 50 – 100µm | | 3 | Clearly visible to the naked eye | < 0.5mm | | 4 | Moderately sized particles | 0.5 – 2.5mm | | 5 | Large particles | > 2.5mm |
To quantify three things:
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CLASS 3 – FAIL
, knows that even microscopic dust can cause a multi-million dollar coating to peel within years. To ensure the steel is truly ready for paint, she relies on , the "Gold Standard" for surface cleanliness. The Test of Truth
Place the adhesive side of the tape onto the black (for light dust) or white (for dark dust) display plate. iso 85023 dust level chart pdf updated
This class defines the physical size of the dominant dust particles on the tape.