A "Class 3" dust level with fine particles (<100 µm) might be acceptable for a pipe coating in a dry climate, but the same Class 3 with coarse particles (300 µm) is an automatic failure for any high-performance coating.
I searched for the specific document but could not find a standalone, officially updated PDF chart released separately by ISO. iso 85023 dust level chart pdf updated
The is essential for coating inspectors, contractors, and engineers. The updated classification (Classes 1–5 based on particle size and quantity) provides clear acceptance criteria. For critical assets, specifying Dust Class ≤ 1 ensures maximum coating longevity and corrosion protection. A "Class 3" dust level with fine particles
, 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 The updated classification (Classes 1–5 based on particle
