Dust volume alone does not present the full picture. Large particles present a greater threat to thin-film coatings because they can bridge or protrude through the dry paint film. ISO 8502-3 divides dust particle sizes into six distinct classes: : Particles not visible under 10x magnification.
If you meant a different standard number (e.g., ISO 8501, ISO 8503, or ISO 8502-6), please clarify and I will generate the correct updated chart. The above is the for “ISO 85023” = ISO 8502-3:2017.
The updated ISO 8502-3 PDF reflects the latest research and developments in the field of coating applications. The revised standard includes:
Cut a piece of tape approximately 200 mm long, press it firmly onto the prepared steel surface, and use a standardized spring-loaded roller (like the Elcometer 145 ) to apply a uniform force between 39.2 N and 49.0 N. iso 85023 dust level chart pdf updated
. Run the roller three times back and forth over the tape, with each stroke lasting roughly 5 to 6 seconds.
In addition to the quantity (Classes 0-5), the standard allows for the classification of particle size, typically described as: Not visible without magnification. Medium Particles: Visible to the eye, but small. Large Particles: Clearly visible. How to Perform the ISO 8502-3 Dust Test
A: The board is usually part of a dust tape test kit, available through manufacturers like Elcometer or Industrial Physics. Dust volume alone does not present the full picture
In the world of protective coatings and abrasive blasting, surface preparation is king. One of the most critical, yet often overlooked, contaminants is dust. Residual dust on blast-cleaned steel surfaces can severely reduce the adhesion of protective coatings and promote premature corrosion by absorbing moisture.
: Place the tape firmly onto the prepared steel surface. Use a calibrated tool like the Elcometer 145 Dust Tape Roller to press it down. This roller applies a mandatory, standardized spring force of
Because ISO standards are copyrighted intellectual property, the official, fully updated ISO 8502-3 document and its visual comparison charts must be acquired through authorized channels: If you meant a different standard number (e
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.
The standard evaluates dust based on two primary metrics: (the density of particles) and Size Class (the diameter of particles). 1. Dust Quantity Ratings (Density)