The indenter is the pointed plunger or needle-like device that is used to make an indentation on the surface of the material being tested. The indenter is typically made of a hard material, such as steel or tungsten carbide, and is designed to penetrate the material to a specific depth under a specified load.

The geometry of the indenter, including its shape and dimensions, is specified by the relevant standard or specification. For example, the Shore A indenter has a conical shape with a point angle of 35 degrees, while the Shore D indenter has a truncated pyramid shape with a point angle of 30 degrees. These geometries are optimized for the specific material being tested and the load force used in the test.

The indenter is attached to a spring-loaded plunger that applies the specified load force to the material being tested. The depth of penetration of the indenter into the material is measured, typically in units of millimetres or thousandths of an inch, and is used to calculate the material’s hardness value.

The indenter parameter of NextGen’s Classic Analogue Shore Durometer is 35 degrees.

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