The Dust Test Tape BS EN ISO 8502-3 assess the quantity and particle size of dust on steel surfaces prepared for painting. Dust on blast-cleaned steel surfaces may reduce the adhesion of applied coatings and by absorbing moisture, may promote the corrosion of the blast-cleaned steel surface.

Accumulation of dust occurs more naturally on horizontal surfaces, the interior of pipes and in structural cavities. Inspection should be carried out to ensure that such areas are adequately cleaned and free from dust before painting.

The pressure-sensitive adhesive tape is pressed on to the steel surface prepared for painting. The tape with the dust adhering to it, is removed and placed on Paper or card, of a colour which contrasts to that of the dust and is examined visually. The quantity of the dust adhering to the tape and the dust particle size are then compared with the equivalent-sized areas of the pictorial references on the BS EN ISO 8502-3 International Standard.

The pictorial references on the BS EN ISO 8502-3 International Standard, relate to the dust particles in the following classes:

0: Particles not visible under X10 magnification.

1: Particles visible under X10 magnification but not with normal or corrected vision (usually particles less than 50µm in diameter).

2: Particles just visible with normal or corrected vision (usually particles between 50µm and 100µm in diameter).

3: Particles clearly visible with normal or corrected vision (particles up to 0.5mm diameter).

4: Particles between 0.5mm and 2.5mm in diameter.

5: Particles larger than 2.5mm in Diameter.

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