Theory of hardness testingBack to overview
The hardness of plastics and hard rubber can be determined using a loaded ball indenter in accordance with standard ISO 2039-1 or ISO 2039-2.
Standard ISO 2039-1 describes determination of the hardness value by means of a ball indenter test. The measured indentation depth is used to calculate the surface area of the indent and subsequently the hardness.
Standard ISO 2039-2 describes determination of the hardness value with a Rockwell hardness testing machine, using Rockwell hardness scales E, L, M and R, similar to the Rockwell method.