DIN ISO 7619-2:2012-02

This document contains the German translation of the International Standard ISO 7619-2:2010, which has been prepared by Technical Committee ISO/TC 45 "Rubber and rubber products" (secretariat: DSM, Malaysia). The responsible national committee is NA 062-04-34 AA "Prüfung der physikalischen Eigenschaften von Kautschuk und Elastomeren" ("Test procedures for physical properties of rubber") at the Materials Testing Standards Committee (NMP). The hardness of rubber, as measured by an IRHD pocket meter or a Shore durometer, is determined from the complex response of the rubber to an applied indentation. An IRHD pocket meter is a portable hand-held durometer calibrated to measure on the IRHD scale. The measurement will depend upon: a) the elastic modulus of the rubber; b) the viscoelastic properties of the rubber; c) the thickness of the test piece; d) the geometry of the indentor; e) the pressure exerted; f) the rate of increase of pressure; g) the interval after which the hardness is recorded. Because of these factors, it is inadvisable to relate results obtained using an IRHD pocket meter directly to Shore durometer hardness values, although correlations have been established for some individual rubbers and compounds.