This ranks how much of the tape area is covered by dust, ranging from 0 to 5. : Surface is free of dust (no visible particles). Class 1 : Very low amount of dust (scattered particles). Class 2 : Small amount of dust. Class 3 : Moderate amount of dust. Class 4 : Significant amount of dust. Class 5 : Dense dust coverage. 2. Dust Size Class This classifies the diameter/size of the particles found. Class 0 : Particles not visible under 10x magnification.
is a practical, cost-effective, and widely accepted field test for assessing loose dust contamination on abrasive-blasted steel. While subjective and limited to visible particles, it remains a valuable quality control tool when combined with clear acceptance criteria and inspector training. For critical applications, it should be complemented by soluble salt testing (ISO 8502-6/9) and surface profile measurement (ISO 8503). dust test iso 8502-3
: Rub the tape firmly with a finger or specialized roller to ensure contact. This ranks how much of the tape area