A scratch tester is primarily used to assess the hardness of coatings through scratch resistance. During the test, a controlled scratch is made with an indenter on a selected area. A stylus moves over the specimen surface with a gradually increasing load until the coating fails at a critical load.
Depending on the test procedures, either a constant or progressive load can be applied to achieve different levels of failure. The load at which the coating fails is called the critical load. The scratch test is widely used to determine the adhesion properties of coatings by measuring these critical loads.
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