Choose a representative area of the blast-cleaned steel. Ensure it is dry and free of condensation.
| Class | Description | Visual Appearance | | :--- | :--- | :--- | | | Very Light | Very few particles visible. The tape looks almost clean. | | 2 | Light | Particles are distinct but sparse. | | 3 | Moderate | Particles are clearly visible and distributed across the tape. | | 4 | Strong | A heavy layer of dust; the tape is significantly obscured. | | 5 | Very Strong
Even with the updated PDF, inspectors make errors. Avoid these: iso 85023 dust level chart pdf updated
In the world of industrial coating and surface preparation, cleanliness is not just about removing rust or old paint. One of the most overlooked yet critical contaminants is —microscopic dust particles that cling to a steel surface after blasting.
Particles visible only under 10x magnification (less than 50 µm). Choose a representative area of the blast-cleaned steel
Dust particles, particularly soluble salts, can act as corrosion initiators under the coating.
The standard evaluates two primary factors: the of dust and the size of the dust particles. This assessment is critical because residual dust can severely reduce paint adhesion and promote corrosion by absorbing moisture. 1. Dust Quantity Ratings (0–5) The tape looks almost clean
The ISO 8502 series was updated in 2017, and the new standards bring some changes to the dust level classification. Here are the key updates:
Use clean, washed, and properly screened abrasives. Low-quality recyclables often break down into excessive fine dust.
Project specifications change, and modern high-build coating systems have tighter tolerances for contamination than legacy systems. Downloadable PDF charts serve several critical functions in asset management: