Typically a clear tape with a specific width (usually 25 mm) and adhesion strength.

: Small amount of dust. Particles are present but highly dispersed.

| | Required Dust Class | Largest Particle Allowed | | --- | --- | --- | | Offshore Wind / Oil & Gas | Class 1 | < 50 µm | | Marine (Ballast Tanks) | Class 1 (or 2 max) | < 50 µm | | Bridges & Highways (C4) | Class 2 | < 100 µm | | Water Tanks (Potable) | Class 1 | < 50 µm | | General Structural Steel (C2/C3) | Class 2 | < 100 µm |

[Strip Tape] ➔ [Discard 3 Turns] ➔ [Apply 200mm Strip] ➔ [Roll/Press 3x] ➔ [Transfer to Chart] ➔ [Grade 1-5] Required Equipment

Compare the tape with the pictorial standards in the ISO 8502-3 chart.

This visual rating compares the density of dust particles on a test tape against pictorial references.

The is an indispensable tool for any coating inspector, contractor, or engineer. Understanding the difference between Class 1, 2, and 3—and correctly applying the pressure-sensitive tape method—can mean the difference between a 20-year coating lifespan and a 6-month failure.

Accessing the correct "iso 85023 dust level chart pdf updated" starts with understanding that the correct standard is . This is the active, definitive method for dust assessment on steel surfaces. The official chart provides a reliable, objective system for rating dust quantity and size, ensuring that surfaces are truly clean and ready for coating. The only way to obtain the official, unaltered PDF is by purchasing it from an authorized distributor. By using the official standard correctly, you can significantly improve coating adhesion and prevent costly premature failures.

In the protective coatings industry, the cleanliness of a steel surface before painting is paramount to its longevity and performance. Surface contaminants, particularly dust generated during abrasive blasting, can significantly hinder coating adhesion, leading to premature failure, blistering, and corrosion.

Trace amounts; particles visible only under magnification. Rating 2: Dust barely visible to the naked eye. Rating 3: Particles clearly visible. Rating 4: Significant dust accumulation; easily noticeable. Rating 5: Heavy contamination. 2. Dust Size Classes (0–5)

Understanding the dust quantity ratings and size classes is essential for inspectors to ensure paint adhesion and prevent premature corrosion. ISO 8502-3 Dust Level Ratings

Tape exhibits overall discoloration (reddish-brown/black), often caused by microscopic dust from specific abrasives. Standard Inspection Procedure

Determined by comparing the tape sample to pictorial references that show the density of dust coverage. Common Acceptance Criteria: Many painting specifications require a maximum Quantity Rating 2 Size Class 2 for high-performance coatings. Rösler Group The Critical Role of ISO 8502-3 in Surface Preparation Introduction

It offers a permanent record of the dust present at the time of inspection.

💡 If the adhesive tape displays an overall, fine discoloration (often reddish-brown from mineral abrasives or black from slag), it indicates an abundance of microscopic dust particles under

While official ISO standards must be purchased directly from ISO or national bodies, updated PDF summary charts allow field inspectors to quickly reference specifications on tablets and smartphones without carrying bulky paper manuals into confined spaces.

Advanced inspection kits now utilize digital optical scanners. The inspector takes the tape sample, places it into a portable scanning device, and the software automatically calculates the percentage of dust coverage, matching it perfectly to the ISO 8502-3 rating scale.

ISO 8502-3 is a global standard developed by the International Organization for Standardization. It outlines the specific method for assessing dust remaining on cleaned steel surfaces before painting.

Many surface inspection equipment suppliers provide physical, laminated, or PDF versions of the ISO 8502-3 chart , such as ⁠Industrial Physics .