Adhesion and adhesion test method

Adhesion

From the largest man-made structures to the smallest household appliances, most products have a protective or whitewash coating. If the coating peels off prematurely, at least it will cause additional costs for repair.

Adhesion testing after painting can quantify the strength of the bond between a substrate and a coating, or between different coatings, or the cohesive strength of some substrates. Routine testing is part of the inspection and maintenance process to help detect possible coating loss in the future.

Adhesion method

Cross cut / cross cut method:

A fast and low-cost visual comparison method for the inspection of paint and powder coatings up to 250μm (10mils).

Coatings are cut into small squares, thereby reducing lateral bonding, and adhesion is evaluated according to ISO, ASTM or corporate standards.

Pull-out test method:

The operation is simple, the range is quantitative, and the viscosity value is given. It is suitable for measuring the coating of flat or curved substrates in the laboratory or field. The drawing dolly is glued to the coating, and after the glue has dried, the force required to peel the coating off the substrate is measured.

Push-pull test method:

The dolly is glued to the coating, and after the glue has dried, the dolly is pushed away from the surface with an instrument. The push-pull design makes this method suitable for flat or curved surfaces.