| Class | Description of Dust Particles | Particle Diameter | |-------|------------------------------|-------------------| | 0 | Particles not visible under ×10 magnification | Not detectable at 10× | | 1 | Particles visible under ×10 magnification but not with normal or corrected vision | < 50 µm | | 2 | Particles just visible with normal or corrected vision | 50–100 µm | | 3 | Particles clearly visible with normal or corrected vision | Up to 0.5 mm | | 4 | Particles clearly visible | 0.5–2.5 mm | | 5 | Particles clearly visible | > 2.5 mm |
Peel the tape off the steel surface and stick it onto a contrasting background (typically a matte black or white card, depending on the color of the dust/abrasive). iso 85023 dust level chart pdf updated
Particles clearly visible with normal vision, ranging from 0.5 mm to 1.0 mm in diameter. | Class | Description of Dust Particles |
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ISO 8502-3 was last confirmed in (no technical changes). The 2017 edition is current. There is no 2024 or 2025 revision .
Marta pulled up the PDF. It loaded slowly, a watermark reading across its header. She compared the old scanned copy on her hard drive to the new official PDF.