Iso 85023 Dust Level Chart Pdf Updated
Severe contamination; tape is fully covered or shows overall discoloration. Severe Failure
The ISO 8502-3 chart uses two primary metrics to evaluate cleanliness:
The chart displays pictograms representing the density of dust, ranging from 0 (clean) to 5 (excessive contamination): No dust visible (excellent cleanliness). Class 1: Very low amount of dust. Class 2: Small amount of dust. Class 3: Moderate amount of dust. Class 4: Large amount of dust. Class 5: Very large amount of dust (failed surface). Dust Particle Size (Descriptive Classes)
The presence of microscopic dust on blast-cleaned steel surfaces is a primary cause of premature coating failures, resulting in poor adhesion, peeling, and bubbling. To combat this, the protective coatings industry relies on , which outlines the standardization for evaluating surface cleanliness via the pressure-sensitive tape method. Having an updated ISO 8502-3 dust level chart PDF is necessary for inspectors and contractors to ensure field tests accurately match international quality requirements. What is the ISO 8502-3 Standard? iso 85023 dust level chart pdf updated
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
Dust on a prepared surface acts as a bond-breaker between the primer and the steel substrate. It can also absorb moisture, leading to osmotic blistering under the paint film. The ISO 8502-3 standard standardizes how inspectors sample, visually evaluate, and record dust contamination before any coating application begins. The Pressure-Sensitive Tape Test Method
| Dust Level | Description | Visual Comparison | | --- | --- | --- | | A | No dust | No visible dust | | B | Light dust | A few small dust particles | | C | Medium dust | Some dust particles, but no continuous coverage | | D | Heavy dust | Continuous coverage of dust particles | Severe contamination; tape is fully covered or shows
Surface preparation is the foundation of any successful protective coating system. Among the many contaminants that can compromise coating adhesion and performance, dust remains one of the most overlooked yet consequential factors on blast-cleaned steel surfaces.
As of 2026, the standard remains highly relevant for professional coating inspectors. Accessing the official, updated pictorial chart is crucial for accurate pass/fail assessments.
: The tape is then placed on a contrasting background (typically white or black) for visual comparison against pictorial references. The Dust Level Chart: Ratings and Classes Class 2: Small amount of dust
A: The board is usually part of a dust tape test kit, available through manufacturers like Elcometer or Industrial Physics.
Always perform a secondary ISO 8502-3 tape test after dust remediation to verify that the surface now meets the contractually mandated threshold.
: Compare the tape sample against the pictorial references in the ISO 8502-3 chart to determine the ratings. iTeh Standards Common Acceptance Criteria