Iso 85023 Dust Level Chart Pdf Updated May 2026
Many coating inspectors create a laminated pocket card. Here is a text-based summary you can copy into a PDF generator for field use:
ISO 8502-3:2017 DUST LEVEL CHART ------------------------------------------------- CLASS 1 – PASS - Particles visible only under magnification (≤10x) - No particles to naked eye - Tape coverage: <1% - Max particle size: <50 µmCLASS 2 – ACCEPTABLE (with approval)
CLASS 3 – FAIL
Action: If Class 3, clean & retest.
Many coating inspectors use a laminated card from:
These suppliers sometimes include the chart as a PDF in their product documentation.
The ISO 85023 dust level chart is a visual and descriptive reference table that classifies the amount of dust remaining on a blasted steel surface. It works in conjunction with the pressure-sensitive tape method (also known as the "tape test").
The chart divides dust contamination into three main classes: iso 85023 dust level chart pdf updated
| Dust Class | Description | Typical Application | |---|---|---| | Class 1 | Dust particles visible only under magnification (≤ 10x). No particles visible to the naked eye. | High-performance coatings (epoxy, polyurethane) for aggressive environments. | | Class 2 | Dust particles visible to the naked eye but not densely distributed. Moderate dust quantity. | General industrial environments. | | Class 3 | Dust layer clearly visible, dense distribution of particles. | Low-performance coatings or non-critical areas (rarely accepted). |
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.
There are two criteria to grade: Quantity (Amount) and Size.
In the world of industrial coating, abrasive blasting, and protective painting, surface cleanliness is not negotiable. Before applying any high-performance coating—whether for a bridge, a pipeline, a ship, or an oil rig—you must ensure the surface is free from soluble salts, oil, grease, and dust. Many coating inspectors create a laminated pocket card
While ISO 8502 focuses on soluble contaminants, ISO 85023 (often confused with the older or related standards) is the critical benchmark for assessing the quantity and size of residual dust on a steel surface after preparation. Technically, the correct designation is ISO 8502-3, but industry professionals widely search for "ISO 85023" as a common typo or legacy reference.
This article provides the fully updated breakdown of the ISO 85023 dust level chart PDF, including how to download the latest version, interpret the classes (1, 2, 3), and apply it correctly on-site.
Note: The correct standard is ISO 8502-3:2017 – Preparation of steel substrates before application of paints and related products – Tests for the assessment of surface cleanliness – Part 3: Dust on steel surfaces prepared for painting (pressure-sensitive tape method).
Document ID: ISO-8502-3-Guide-2025
Subject: Surface cleanliness, dust grading, coating quality assurance
Applicable to: Abrasive blast-cleaned steel prior to coating CLASS 3 – FAIL