During the Buchholz hardness test, we establish the hardness of powder lacquer coatings using a standardized pressing cylinder and loading weight. The measurement result is derived from placing and loading the gauge on a coating cleaned from any impurities, from the length of the dent created within 30 seconds. The weight of the loading weight was standardized at the development of the Buchholz method, which is the same for every coating test. By determining the length of the dent using a microscope (Figure 2), the Buchholz hardness value is derived using the following formula:
In our laboratory, we perform our measurements using a GYK Gardner PIG Universal on the sample plates coated by the partner. We summarize the measurement results and deliver them to our clients in measuring logs.
It is a procedure suitable for the testing of the hardness of coatings exposed to permanent stress. In the course of the Buchholz hardness test, we measure the deforming effect of the pressure on a unit of the surface of powder lacquer coatings. In everyday life, such phenomenon occurs at each force closing bond. To the effect of the contact pressure generated in force closing bonds, it suffers a permanent deformation in the case of an insufficient hardness of the paint coating. We use the Buchholz measurement to determine the hardness of the coating, from which we can draw conclusions for future deformations. From the test result, we can draw conclusions on the appropriateness of the baking cycle. The hardness test can be performed on sample plates and workpieces alike.
We undertake measurements characteristically within 1 business day on our own site. We can undertake tests at other sites for booking within 5 business days.