IRHD Hardness Testing Machine is used to measure the hardness of various types of rubber materials. The machine determines the indentation depth made by a specified indenter under specified conditions of load and time. The IRHD test method is widely used for testing the hardness of natural and synthetic rubbers, as well as other elastomers. The test result is expressed in IRHD degrees, which is a measure of the resistance to indentation of the rubber material. The IRHD Hardness Testing Machine consists of a load frame, an indenter, a test specimen holder, and a digital readout unit that displays the hardness value.