Iso 85023 Dust Level Chart Pdf Updated ((link))

The new chart emphasizes that even if quantity is Class 2, if any particle exceeds 100 µm, the overall rating drops to Class 3.

Performing the test accurately requires specific equipment and a strict adherence to the methodology to ensure reproducible results. Required Equipment

The presence of microscopic dust on blast-cleaned steel surfaces is a primary cause of premature coating failures, resulting in poor adhesion, peeling, and bubbling. To combat this, the protective coatings industry relies on , which outlines the standardization for evaluating surface cleanliness via the pressure-sensitive tape method. Having an updated ISO 8502-3 dust level chart PDF is necessary for inspectors and contractors to ensure field tests accurately match international quality requirements. What is the ISO 8502-3 Standard?

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

These particles, if left untreated, act as a wick for moisture absorption and destroy coating adhesion, leading to premature failure like osmotic blistering or delamination.

The standard remains the current global benchmark for assessing dust on steel surfaces before painting. While it was last confirmed in 2022, the methodology and pictorial references established in the 2017 update continue to serve as the industry standard for quality control in 2024 and beyond.

A: Re-blast the surface, then use compressed air and a vacuum brush. Retest until Class 1 is achieved. The new chart emphasizes that even if quantity

You can download the ISO 8502-3:2017 PDF from the following sources:

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 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. To combat this, the protective coatings industry relies

A 7x or 10x magnifier (with a graticule) to evaluate particle sizes.

Any tape recording a Quantity 3, 4, or 5 fails inspection. If a surface fails, it must be blown down with clean, dry compressed air or vacuumed, and re-tested from scratch. Downloadable & Physical Tooling Options

Painting schedules and coating specifications typically require that shot-blasted surfaces prior to painting be free of dust. A generally accepted industry rule stipulates that of ISO 8502-3.

“The particle density,” Jan said. “The old chart showed Size 3 as scattered particles under 10x magnification. The new update—ISO 85023-3:2025—has revised the micrograph. Size 3 now shows clusters . Which means our current ‘acceptable’ threshold for turbine tower internals is now a ‘reject’.”

The most current version of the standard is , which details the "pressure-sensitive tape method" for assessing dust on blast-cleaned steel surfaces. This assessment involves comparing a used tape sample against pictorial ratings to determine both dust quantity and particle size . ISO 8502-3 Dust Classification Chart