Iso 85023 Dust Level Chart Pdf Updated Today

I understand you’re looking for a document on ISO 8502-3 (often confused with a non-existent “ISO 85023”), which is the standard for assessing dust levels on steel surfaces before coating. There is no ISO 85023 — the correct reference 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: Assessment of dust on steel surfaces prepared for painting). Below is a full, ready-to-use technical paper that includes the updated dust level chart, interpretation guide, and practical application. You can copy this directly.

Technical Paper: ISO 8502-3:2017 – Assessment of Dust Level on Steel Surfaces (with Updated Reference Chart) Document ID: ISO-8502-3-Guide-2025 Subject: Surface cleanliness, dust grading, coating quality assurance Applicable to: Abrasive blast-cleaned steel prior to coating 1. Introduction 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 updated dust level classification chart and interpretation guidelines. 2. Key Definitions (ISO 8502-3:2017)

Dust: Particulate matter (abrasive residue, rust, mill scale, environmental fallout) remaining after cleaning. Assessment method: Adhesive tape pressed onto the surface → tape placed on a clean white background → particles counted and sized under magnification (×10 to ×50) or compared to reference photographs. Reporting: Quantity (number of particles per area) + size (µm) of largest typical particles.

3. ISO 8502-3:2017 Dust Level Chart (Updated) | Dust Class | Maximum Particle Size (µm) | Typical Quantity (particles/cm²) | Visual / Tape Appearance | Typical Coating Suitability | |------------|----------------------------|----------------------------------|--------------------------|-----------------------------| | 1 | < 50 | 1–5 | Almost invisible, very few tiny specks | High-performance systems (epoxy, polyurethane, marine) | | 2 | 50 – 100 | 6–20 | Scattered small dots, clearly visible on tape | Industrial coatings (alkyd, epoxy mastic) | | 3 | 100 – 200 | 21–50 | Many medium-size particles, no clustering | Low-risk environments only (non-immersion) | | 4 | 200 – 300 | 51–100 | Dense particles, some clusters visible | Not acceptable for critical coatings | | 5 | > 300 | > 100 | Heavy dust layer, clumps | Rejection – requires re-blasting or cleaning | iso 85023 dust level chart pdf updated

Note: For offshore, immersed, or chemically aggressive environments, Dust Class ≤ 2 is mandatory. For high-durability coatings (e.g., C5-M, CX), Dust Class 1 is required.

4. How to Use the Chart (Step-by-Step)

Select tape – pressure-sensitive adhesive tape (e.g., Scotch® 898 or equivalent, per ISO 8502-3). Apply – press firmly onto cleaned steel surface using a roller or thumb pressure (uniform). Remove – peel off at 90°. Mount – stick tape onto a clean white card or glass slide. Inspect – use a 10× magnifier with an eyepiece reticle (or comparison scale). Assign class – based on largest typical particle size and density. I understand you’re looking for a document on

5. Common Errors & Corrections | Error | Consequence | Correction | |-------|-------------|-------------| | Using non-approved tape | Underestimates dust | Use ISO-specified tape | | Pressing too lightly | Misses embedded dust | Apply ≥ 5 N/cm² pressure | | Viewing without magnification | Misses fine dust (Class 1–2) | Always use ×10 minimum | | Only checking one location | Non-representative result | Take 5 samples per 10 m² | 6. Comparison: ISO 8502-3 vs. Other Dust Standards | Standard | Method | Scale | Typical Use | |----------|--------|-------|--------------| | ISO 8502-3:2017 | Tape lift | 5 classes (1–5) | Blast-cleaned steel | | SSPC-VIS 4 | Visual | 0–5 (photographs) | Steel & concrete | | NACE No. 12 / SSPC 12 | Tape + photo | 4 classes | Abrasive blast only | 7. Reporting Template A compliant ISO 8502-3 report should include: - 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:

8. Conclusion The ISO 8502-3 dust level chart is essential for coating inspectors, contractors, and engineers. The updated classification (Classes 1–5 based on particle size and quantity) provides clear acceptance criteria. For critical assets, specifying Dust Class ≤ 1 ensures maximum coating longevity and corrosion protection.

Appendix – Quick Reference Card (Printable) ┌──────────────┬─────────────────┬─────────────────┐ │ ISO 8502-3 │ Max particle (µm)│ Coating action │ │ Dust Class │ │ │ ├──────────────┼─────────────────┼─────────────────┤ │ 1 (Best) │ < 50 │ Proceed │ │ 2 (Good) │ 50–100 │ Proceed (unless │ │ │ │ immersed) │ │ 3 (Fair) │ 100–200 │ Clean surface │ │ 4 (Poor) │ 200–300 │ Re-blast │ │ 5 (Reject) │ > 300 │ Re-blast │ └──────────────┴─────────────────┴─────────────────┘ You can copy this directly

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 complete, correct paper for “ISO 85023” = ISO 8502-3:2017.

Important Clarification: There is no official document named "ISO 85023." The correct standard is ISO 8502-3 . This is part of the ISO 8502 series, which deals with surface cleanliness tests. Below is a comprehensive guide on how to use the ISO 8502-3 standard, understand the dust level chart, and where to find the updated PDF resources.