The standard also defines six descriptive classes for the . The size class is identified by the largest particles present in the sample. The following table provides the descriptive size classes.
Provides a clear, unambiguous benchmark that asset owners, blasting contractors, and paint inspectors agree upon before work begins.
The table below provides a clear breakdown of the dust particle size classes as defined by the standard.
[Extract Tape] ➔ [Apply via Roller/Thumb] ➔ [Peel & Place on Board] ➔ [Evaluate & Record] Step 1: Equipment Preparation Iso 8502-3 2017 | PDF - Scribd iso 85023 dust level chart pdf updated
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.
| Size Rating | Description of Dust Particles | | :--- | :--- | | | Particles not visible under 10x magnification. | | Class 1 | Particles visible under 10x magnification but not visible to the naked eye (generally less than 50 µm). | | Class 2 | Particles just visible to normal or corrected vision (50 to 100 µm in diameter). | | Class 3 | Particles clearly visible to normal or corrected vision (less than 0.5 mm in diameter). | | Class 4 | Particles 0.5 to 2.5 mm in diameter. | | Class 5 | Particles greater than 2.5 mm in diameter. |
Particles visible only under 10x magnification (less than 50 µm). The standard also defines six descriptive classes for the
When looking for the "Dust Level Chart PDF," you are looking for the visual grading system defined in the standard. The chart consists of photographs or drawings of tape strips with varying amounts of dust.
- Surface identification: [tank, pipe, beam] - Cleaning method: [garnet, slag, steel grit] - Dust assessment date & time: - Ambient conditions (humidity, temp): - Tape brand & batch number: - Sample locations (grid or sketch): - Dust class per ISO 8502-3:2017: _____ - Largest particle size observed: _____ µm - Inspector name & signature:
For quality control inspectors, asset owners, and protective coating professionals, using an updated is critical to verifying that a substrate meets strict industrial cleanliness criteria before any primer or paint is applied. What is the ISO 8502-3 Dust Tape Test? Provides a clear, unambiguous benchmark that asset owners,
Note: If the tape displays an overall uniform discoloration (reddish-brown from garnet/grit or black from slag), it is automatically classified as . This microscopic dust can cause severe paint delamination. 2. Dust Particle Size Classes (0 to 5)
The ISO 8502-3 dust level chart is a visual guide used to classify the dust levels on steel surfaces. The chart provides a reference for assessing the cleanliness of surfaces, which is crucial in ensuring the adhesion and performance of coatings.
The uses a 0 to 5 scale to rate the volume of dust covering a specified sample area. Industry specifications usually establish a maximum acceptable rating (typically Rating 1 or 2 for high-performance marine or industrial coatings). Dust Quantity Rating Description / Visual Guide Acceptance Level Rating 0
Dense, continuous layer of dust covering the entire tape area. Failed surface; requires complete recleaning.