Tear-off test
The pull-off test checks the adhesive strength of coatings or overlays on a material. A defined force is applied perpendicular to the surface to separate the material.
Physical-Chemical Mechanism of Action
The pull-off test measures the force required to remove a coating or overlay from the base material. This is done by applying a defined force perpendicular to the surface.
Metallurgical Relevance & Welding Risks
A failed pull-off test can indicate that the adhesive strength of the coating is too low. This leads to poor bonding between the coating and the base material, which can cause cracks or corrosion.
Workshop Practice & Instructions
For the pull-off test, a specific force in Newtons (N) is used. The exact force depends on the material and the desired adhesive strength. A typical test value is 5 N/cm². It is important to apply the force perpendicular to the surface and to perform the process slowly and in a controlled manner.