Plastics and ebonite.The choice of the hardness tester type and model depends on the characteristics of the parts to test, the material and the level of accuracy required for the final hardness result. Indentation hardness by IRHD pocket meter method

Rubber, vulcanized or thermoplastic - Determination of hardness - Part 4: Indentation hardness by durometer method (Shore hardness) Potting compounds, general plastic parts, vinyl flooring, brake pads, calendar rolls Hard rubber, rigid polyurethane, thermo plastics, epoxy resin Medium hard rubber, polyurethane, plastics General rubber parts, tyres, rollers, piano felts, sealants, seals, O-Rings Shore A, Shore 'A' Micro (M), IRHD, IRHD Micro (M) Medium hard rubber, flexible polyurethane, soft polymers, felts Pad printers, fruit, tissues, automotive trim Soft rubber, sponge rubber, skinned urethane foam, cork Of Ball & Loadings, (N) Normal, (H) High and (L) Low. The standard shows three different combinations

The displacement/IRHD degreesĬonversion table is published in ISO 48 : 1994. The differential indentation depth is measuredĪnd tabulated to read directly in 'IRHD' degrees. Indents the sample under a minor and major Load. The IRHD (International Rubber Hardness Degrees) instrument has a spherical indentor which The instrument is comparative and is supplied withĪ set of reference blocks which enable calibration to the macro 'A' value. The microhardness tester reading Shore 'A' Micro is basically a combination of 'OO' SpringĪnd 'D' Indentor (set at 0.050inch (1.25mm)). Scales 'B' & 'C' are intermediate scales and the specifications are hybrids of the The scales 'OO' is designed to read materials less than 10 Shore 'O'. Materials reading below 10 degrees and above 90 degrees can be tested using Shore O & D Therefore, the harder the material, the more the deflection, the higher the number. Indentor, extends 0.098inch (2.5mm)) and is pressed onto the sample against an 822g spring.Įach 0.001 inch of deflection of the indentor is shown as 1 degree Shore (A), Values are obtained as a function of the viscoelastic property of the material. The Shore type instrument is a spring loaded indentation device, in which Microhardness testers, Shore 'A' Micro (M), or IRHD Micro (M), are utilised to measure samples which are too small for testing with macro instruments. These tests are designed for use with samples approx 6mm thick, and a surface area sufficient to permit at least 3 test Elastomeric materials are usually measured with either a Shore A Scale Durometer or an IRHDĭead load system.

Ball indenter irhd