⚠️ Always ensure you download the 2017 revision or later . Older pre-2010 versions lacked the refined particle size classification and adhesive transparency specifications.

ISO 8502-3 Dust Level Chart: The Complete Guide to Surface Cleanliness

ISO 8502-3 specifies a simple, field-friendly method using (commonly a transparent Scotch tape of defined tackiness) to lift dust from a prepared steel surface. The tape is then applied to a contrasting background (typically a white or black card), and the extracted dust is compared against a standardized reference scale.