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Below is a that includes the updated dust level chart, interpretation guide, and practical application. You can copy this directly.
There are two criteria to grade: (Amount) and Size .
The standard is a critical framework used in industrial coating to evaluate dust contamination on blast-cleaned steel surfaces. As of April 2026, the 2017 second edition remains the most current and widely referenced version, having technically revised and replaced the original 1992 standard. Core Assessment Mechanism
The standard utilizes a qualitative to extract dust from a prepared surface and compare it against a standardized chart. 1. Dust Quantity Ratings (1–5)
A: The official ISO chart is copyrighted. However, many training providers offer free summary reference cards. Do not use unofficial PDFs for contractual disputes.
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.
Searching for the is the first step to compliance. Visit your national standards body or a reputable NACE training center today to download the official version.

February 13, 2025
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