Mechanical Adhesion Testing

Last updated: May 4, 2019

What Does Mechanical Adhesion Testing Mean?

Mechanical adhesion testing measures the adhesive properties of industrial paints and coatings with the help of a pull-off type instrument. The instrument consists of an aluminum pull stub (also called a loading fixture) that can be bonded with the coating surface. Once the coating dries and the bonding is strong between the pull stub and the coating, a tensile force is applied by the pull stub. The pull-off type instrument measures the amount of force when the coating detaches from the surface. The force gradually increases until the coating detaches.

Mechanical adhesion testing is also known as a tensile pull-off adhesion test.


Corrosionpedia Explains Mechanical Adhesion Testing

This test measures a coating's resistance to separate from a substrate by applying a perpendicular tensile force. The measured pull-off force provides an indication of the strength of the adhesion between the coating and the substrate. This test is primarily used for industrial coatings.

In this test, the coating's adhesion is determined by measuring the least tensile stress required to detach or rupture the coating perpendicular to the substrate. The test is performed by securing loading fixtures (dollies) perpendicular to the surface of a coating with an adhesive.

This test is performed on samples before applying a full-scale coating application if an adhesion issue is suspected on old substrates, such as contaminated concrete.

This test is destructive and requires spot repairs.



Tensile pull-off adhesion test

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