Marta minimized the PDF and opened her field notes. She remembered that turbine. The steel had looked clean, but there had been a faint, shadowy haze in one corner. Under the old rules, it was a Size 2.5—acceptable. Under the new updated chart, with its stricter clustering definition, it was a clear Size 3. Reject.
Small, scattered groupings of dust; standard pass threshold. Medium density; clear, widespread particle clusters. Rating 4 Heavy accumulation; large portions of the tape are covered. Rating 5 Severe / Discolored Total coverage or uniform tape discoloration. 2. Dust Particle Size Classes (0 to 5)
Please note that you may need to purchase a copy of the standard or have a subscription to access the PDF. iso 85023 dust level chart pdf updated
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 . Decoding the Dust Level Chart
: Trace to light dust (often acceptable for high-performance coatings). Marta minimized the PDF and opened her field notes
As an example, the German edition is available for €72.00 from normadoc.com. Prices vary by distributor and language version.
In other words:
The "chart" refers to the pictorial references used to classify the dust collected on a piece of tape. The test involves pressing a specialized adhesive tape onto the blasted surface, removing it, and then comparing the tape to the chart.
Dust on blast-cleaned steel surfaces reduces coating adhesion, causes osmotic blistering, and creates premature failure points. ISO 8502-3:2017 specifies a method for assessing the quantity and size of dust particles remaining after surface preparation. This paper provides the and interpretation guidelines. Under the old rules, it was a Size 2