Adhesion refers to the sum of the adhesion between the paint film and the substrate. The two main factors that affect the adhesion between the paint film and the substrate are the wetting of the paint to the substrate and the surface roughness of the substrate.
There are two main methods of adhesion test: cross-cut method and pull-off method.
The cross-cut method can be used for testing and is more suitable for on-site construction. Relevant test standards include ISO 2409, ASTM D 3359 and GB/T 9286. The knives used for cross-cutting can be single-edged or multi-edged, and there is also an electric cross-cut adhesion Tester.
The pull-off method belongs to the peel test method. It is mainly used to measure the work required to peel the coating film from the substrate, or the force required to pull the coating film from the substrate for a certain area in the vertical direction. Data can be used to represent the size of the adhesion. The test instruments of the pulling method are divided into manual mechanical and pneumatic.
