The standard employs a qualitative approach known as the "pressure-sensitive tape method".
Always perform a high-pressure air blow-down after blasting. Ensure the compressed air used for blowing down is strictly oil-free and dry (compliant with ASTM D4285).
Dust volume alone does not present the full picture. Large particles present a greater threat to thin-film coatings because they can bridge or protrude through the dry paint film. ISO 8502-3 divides dust particle sizes into six distinct classes: : Particles not visible under 10x magnification. iso 85023 dust level chart pdf updated
High cleanliness; standard requirement for underwater or immersion service.
Highest quantity of surface dust (often looks like overall discoloration). iTeh Standards 2. Dust Particle Size Classes The standard employs a qualitative approach known as
ISO 8502-3 is a globally recognized standard that defines a method for assessing the quantity and size of dust particles remaining on blast-cleaned steel surfaces prior to painting.
The evaluation relies on a simple, field-proven technical procedure: Dust volume alone does not present the full picture
Particles visible under 10x magnification only (under 50 μm). 10x Illuminated Magnifier
If you can tell me you are in (shipbuilding, infrastructure, oil & gas), I can provide more specialized, industry-focused inspection guidance . YouTube·The Institute for Oil & Gas Sector (IOGS)