Cross-cut test (adhesion of coatings)

The cross-cut test is a quick orientation test for the adhesion of coatings to the substrate. It provides a visual classification in classes 0–5 (0 = very good) and no adhesive strength in N/mm².

How is it tested?
A cross-cut tester is used to make intersecting cuts down to the substrate (cut spacing appropriate to the layer thickness). Loose particles are removed and, if necessary, adhesive tape is briefly applied and pulled off. The tear pattern is classified into classes 0–5 according to the standard.

Important for classification
For thick/multi-layer systems, especially corrosion protection on steel: Cross-cut/X-cut according to ISO 16276-2 (usually published in Germany as DIN EN ISO 16276-2).
For numerical adhesion strength: Pull-off test according to DIN EN ISO 4624.

Relevant standards (selection)

• DIN EN ISO 2409 – Cross-cut test.
• ISO 16276-2 / DIN EN ISO 16276-2 – Evaluation of adhesion (cross-cut/X-cut) for protective coatings.
• DIN EN ISO 4624 – Tear-off test (adhesion strength in N/mm²).