Master Guide to the ISO 8502-3 Dust Level Chart: The Ultimate Cleanliness Resource for Protective Coatings
Digital PDFs often include interactive report templates. Inspectors can log their findings, attach digital photos of the test tapes side-by-side with the chart reference, and sign off electronically. Typical Specification Requirements
Heavy accumulation. Distinct clusters covering parts of the tape.
Dust on blast-cleaned steel surfaces reduces coating adhesion, causes osmotic blistering, and creates premature failure points. ISO 8502-3:2017 specifies a method for assessing the quantity and size of dust particles remaining after surface preparation. This paper provides the and interpretation guidelines. iso 85023 dust level chart pdf updated
If you are setting up an inspection plan, ensure you obtain an official copy of the standard alongside your field reference charts to guarantee complete compliance with global engineering specifications.
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This class defines the physical size of the dominant dust particles on the tape. Master Guide to the ISO 8502-3 Dust Level
Accurate metric indicators for Size Classes 1 through 5.
The core of any ISO 8502-3 inspection is the visual comparison chart. When inspectors refer to an updated PDF chart, they are looking for the standardized graphic representations of dust particle density.
: Particles visible with normal vision but less than 0.5 mm in diameter. Distinct clusters covering parts of the tape
For accurate classification, you need a high-resolution, color-calibrated PDF. Print it on photo paper or use a color-accurate tablet in the field.
Ensure your PDF reference reflects the latest revisions regarding standard backcloth colors. Typically, a black background is used for light-colored dust (garnet, silica, aluminum oxide) and a white background for dark dust (coal slag, steel grit). Best Practices for Passing an ISO 8502-3 Inspection
Very low dust level; particles are barely visible to the naked eye.
The most current version of the standard is ISO 8502-3:2017 , which was last reviewed and confirmed in 2022 and remains the active version for 2026. It defines a qualitative "pressure-sensitive tape method" to assess dust quantity and size on blast-cleaned steel. ISO 8502-3 Dust Level Assessment
Severe contamination; tape is fully covered or shows overall discoloration. Severe Failure