Peel the tape off the steel surface and stick it onto a contrasting background (typically a matte black or white card, depending on the color of the dust/abrasive).
. Per the standard, this overall discoloration must be recorded as . Step-by-Step Procedure for a Valid Dust Tape Test
The international standard provides a globally accepted method for assessing dust on steel surfaces prepared for painting. This comprehensive guide breaks down the assessment methodology, explains the dust quantity and size ratings, and provides insights into the latest compliance updates. What is ISO 8502-3?
To properly use the dust level chart, you must first collect a representative dust sample. Follow this updated procedure: iso 85023 dust level chart pdf updated
Press approximately 150 mm (6 inches) of the freshly exposed tape firmly onto the surface to be tested, touching the adhesive side only at the ends. Place the thumb across one end of the tape and move the thumb along the tape at a constant speed and pressure. Repeat this motion three times in each direction, with each stroke taking approximately 5 to 6 seconds.
Accurate metric indicators for Size Classes 1 through 5.
A reference displaying defined dust quantity and particle size ratings. Peel the tape off the steel surface and
Particles visible only under 10x magnification (less than 50 µm).
Peel the tape off and place it onto a contrasting background (usually a black or white test chart).
Quantity is determined by comparing the test tape to pictorial reference standards. INTERNATIONAL STANDARD ISO 8502-3 Step-by-Step Procedure for a Valid Dust Tape Test
A specific pressure-sensitive adhesive tape with an adhesion strength of at least 6.7 N per 25 mm width.
Always ensure you are using the revision, obtain the official PDF for legal traceability, and carry a laminated reference card for daily field use.
magnifier to grade the size class, and compare the overall pattern visually to the pictorial reference chart to log the quantity rating. Understanding the Updated PDF Requirements
| Standard | Method | Scale | Typical Use | |----------|--------|-------|--------------| | ISO 8502-3:2017 | Tape lift | 5 classes (1–5) | Blast-cleaned steel | | SSPC-VIS 4 | Visual | 0–5 (photographs) | Steel & concrete | | NACE No. 12 / SSPC 12 | Tape + photo | 4 classes | Abrasive blast only |