Hardness test of metallic samples

The most common indentation hardness scales are Vickers, Brinell, Knoop or Rockwell.
Hardness tests are mainly conducted on a basic premise of measuring the dimensions of an indentation left by a sharp tool (indenter) in the metal sample. The hardness value is defined by the value of the applied load on the indenter.
Before any hardness tests, the surface of the samples should be carefully polished in order to get clear and precise measures.
PRESI offers a large range of polishing machines and hardness testers adapted for all types of hardness tests in metallography.