Iso 85023 Dust Level Chart Pdf Updated

ISO 8502-3 is the international standard used to assess the quantity and size of dust particles on steel surfaces prepared for painting. Ensuring a surface is "dust-free" is critical because even invisible particles can cause coating failure, blistering, or poor adhesion.

The test uses a specific pressure-sensitive adhesive tape that is pressed onto the steel and then transferred to a display card for comparison against a visual rating scale. The 5 Levels of Dust Quantity

The chart rates dust from Class 0 (cleanest) to Class 5 (dirtiest) based on a visual comparison: Class 0: No dust visible under 10x magnification.

Class 1: Very slight amount of dust; particles are far apart.

Class 2: Small amount of dust; particles are visible but sparse.

Class 3: Moderate amount of dust; clearly visible to the naked eye.

Class 4: Significant amount of dust; covers a large portion of the tape. iso 85023 dust level chart pdf updated

Class 5: Dense dust layer; the surface is completely covered. Particle Size Classes

In addition to quantity, the standard categorizes the size of the particles found: Class 0: Particles not visible under 10x magnification.

Class 1: Particles visible only under 10x magnification (less than 0.05mm). Class 2: Particles 0.05mm to 0.15mm in diameter. Class 3: Particles 0.15mm to 0.25mm in diameter. Class 4: Particles 0.25mm to 0.50mm in diameter. Class 5: Particles larger than 0.50mm. Why the "Updated" PDF Matters

Recent updates to industry best practices (often referenced in NAVSEA or NORSOK standards) emphasize that a Class 2 Quantity and Class 2 Size are typically the maximum allowable limits for high-performance immersion coatings (like tank linings).

⚠️ Key Reminder: The official ISO 8502-3 chart is a copyrighted document. While summary PDFs are available from equipment manufacturers (like Elcometer or TQC Sheen), the actual visual comparison must be done using high-quality printed masters to ensure accuracy. To help you get exactly what you need, let me know:

Do you need to know the specific requirements for a certain industry (e.g., Marine or Oil & Gas)? ISO 8502-3 is the international standard used to

Are you trying to find a supplier for the official test kits?

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.

Industry Applications and Acceptance Criteria

Different industries interpret the ISO 85023 dust level chart differently. Always confirm with the project specification.

| Industry | Required Dust Class | Largest Particle Allowed | | --- | --- | --- | | Offshore Wind / Oil & Gas | Class 1 | < 50 µm | | Marine (Ballast Tanks) | Class 1 (or 2 max) | < 50 µm | | Bridges & Highways (C4) | Class 2 | < 100 µm | | Water Tanks (Potable) | Class 1 | < 50 µm | | General Structural Steel (C2/C3) | Class 2 | < 100 µm |

Common Mistakes When Using the ISO 8502-3 Dust Chart

Even with the updated PDF, inspectors make errors. Avoid these: Common Mistakes When Using the ISO 8502-3 Dust

Mistake #1: Using standard office tape. The ISO standard requires tape of specific adhesive force (approx. 8 N/25mm). Art masking tape is too weak; duct tape is too strong.
Mistake #2: Failing to clean the contrasting card. Dust on your reference card invalidates the comparison.
Mistake #3: Ignoring dust embedded in the anchor pattern. The tape lift only retrieves loose dust. If dust is welded into pits, you must re-blast.
Mistake #4: Using the printed chart without a magnifier. Particles <100 µm look identical to >200 µm to the naked eye. Always use 10x minimum.

Is the PDF "Updated"?

There has been some confusion regarding updates to this standard.

The Main Standard: The primary methodology is defined in ISO 8502-3:2017. This replaced the older 1992 version. While the visual chart concept remains similar, the 2017 version refined the procedures and reporting methods.
Visual Comparators: Many contractors look for a PDF of the chart to print and use. Important Note: According to the ISO standard, printed PDF copies of the chart are not compliant for official testing. The standard states that photographs in printed documents are for illustration only and do not have the resolution required for accurate assessment.
Official Tools: For accurate assessment, you must use a specialized Dust Tape Test Kit. These kits include a certified, high-resolution pictorial rating card (the "chart") on rigid plastic or card stock that ensures color and scale accuracy.

The Ultimate Guide to the ISO 85023 Dust Level Chart PDF (Updated Edition)

Meta Description: Need the latest ISO 85023 dust level chart? This guide explains the updated PDF version, how to read the chart, test methods (tape/bristle), and why it matters for surface cleanliness before coating.

Where to Get the Legitimate Updated PDF:

ISO Central Secretariat (iso.org) – The official source. Expect a fee (approx. 150 CHF). You get the full standard, including the color chart.
National Standards Bodies: Such as ANSI (USA), BSI (UK), DIN (Germany), or JSA (Japan). These sell identical content.
Coating Inspection Equipment Suppliers: Companies like Elcometer, DeFelsko, or TQC Sheen often include a digital copy of the chart within their product manuals or offer it as a free download to registered customers. Search their "surface cleanliness" resources.
Industry Association Portals: SSPC and NACE (now AMPP) members often have access to standards packages that include ISO 8502-3.

Do not settle for a blurry screenshot. 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.

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.

Introduction: Why the ISO 85023 Standard Matters

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.

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).

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 |