Ball indenter irhd iso#
The displacement / IRHD degrees conversion table is published in ISO 48 : 1994. The differential indentation depth is measuredĪnd tabulated to read directly in “IRHD” degrees. The method for measuring IRHD hardness’s is through an instrument with a spherical indenter which indents the sample under a minor and major Load. Measuring IRHD ( International Rubber Hardness Degrees) Each 0.0254 mm of deflection of the indenter is shown as 1 degree Shore (A), therefore, the harder the material, the more the deflection, the higher the number. The cone indenterĮxtends 2.5mm from the base plate and is pressed onto the sample material, generating resistance against an 822g spring. The method for measuring Shore hardness’s is through a spring loaded indentation device, on which values are obtained as a function of the viscoelastic property of the material. These tests are designed for use with samples approximately 6mm thick, and a surface area sufficient to permit at least 3 test points 5mm apart and 13mm from the edge of the material. Elastomeric materials are usually measured with either a Shore A Scale Durometer or an IRHD dead load system.
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