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.
The standard specifies a simple, low-tech method using a specialized "dust tape kit."
The goal? To quantify three things:
| 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 |
Determined by comparing the tape sample to pictorial references that show the density of dust coverage. Common Acceptance Criteria: Many painting specifications require a maximum Quantity Rating 2 Size Class 2 for high-performance coatings. Rösler Group The Critical Role of ISO 8502-3 in Surface Preparation Introduction iso 85023 dust level chart pdf updated
Step 2: Mount the Tape
Standing on the wind-swept girders, Sarah pulls out her ISO 8502-3 Dust Tape Test Kit. She discards the first three turns of the specialized adhesive tape to ensure no contamination from the roll itself. She firmly presses a 200mm strip onto the shot-blasted steel, using her thumb to apply even pressure—a technique known as the "Pressure-Sensitive Tape Method". Decoding the Dust Level Chart Important Clarification: There is no official document named
Document ID: ISO-8502-3-Guide-2025
Subject: Surface cleanliness, dust grading, coating quality assurance
Applicable to: Abrasive blast-cleaned steel prior to coating