Hardness is one of the most important properties, which determine the suitability of any rubber component for its intended end use. Incorrect hardness may defeat the basic purpose for which the component is designed. Thus accurate and reliable determination of hardness is of extreme importance in rubber field.
The Shore A Hardness Tester, also called as Durometer, is the most commonly used instrument for measurement of hardness of any rubber component. It is based on the measurement of depth of indentation of an indentor of specified shape being forced into the material under a specified pressure. This test method is an empirical method intended primarily for control purposes. No simple relationship exists between hardness determined by this test method and any fundamental property of the material being tested.