: Moderate dust presence. Clearly visible groupings of particles.
Below is a that includes the updated dust level chart, interpretation guide, and practical application. You can copy this directly.
To apply a standardized force of approximately 39.2 N when pressing the tape onto the surface. Test Procedure iso 85023 dust level chart pdf updated
ISO 8502-3 Dust Level Chart PDF Updated: Comprehensive Guide to Surface Cleanliness (2026)
[Strip Tape] ➔ [Discard 3 Turns] ➔ [Apply 200mm Strip] ➔ [Roll/Press 3x] ➔ [Transfer to Chart] ➔ [Grade 1-5] Required Equipment : Moderate dust presence
The complete, authoritative standard can be purchased via ISO or ANSI.
High density. Particles cover a significant portion of the tape, forming a dense pattern. You can copy this directly
is the internationally recognized standard governing the assessment of dust on blast-cleaned steel surfaces before painting. Dust on a substrate severely weakens coating adhesion. It traps moisture, leading to premature blistering, peeling, and failure of the entire coating system.
When recording results, you typically combine these metrics (e.g., "Quantity Class 3, Size Class D").