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
is the international standard titled "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." iso 85023 dust level chart pdf updated
Dense dust layer; the surface is completely covered. Particle Size Classes Determined by comparing the tape sample to pictorial
When looking for the "Dust Level Chart PDF," you are looking for the visual grading system defined in the standard. The chart consists of photographs or drawings of tape strips with varying amounts of dust. Particle Size Classes When looking for the "Dust
Residual dust on blast-cleaned steel acts as a "bond-breaker" between the substrate and the protective coating. Even a thin layer of microscopic particles can reduce adhesive strength, leading to premature delamination or blistering. Furthermore, dust is often hygroscopic; it can trap moisture against the steel, accelerating corrosion under the paint film, often before the asset even enters service. ISO - International Organization for Standardization INTERNATIONAL STANDARD ISO 8502-3