DIN ISO 27588:2014-12

This document contains the German translation of the International Standard ISO 27588:2012, which has been prepared by Technical Committee ISO/TC 45 "Rubber and rubber products", Subcommittee SC "Testing and analysis" (secretariat: JISC, Japan). The responsible national committee is Working Committee NA 062-04-34 AA "Prüfung der physikalischen Eigenschaften von Kautschuk und Elastomeren" ("Test procedures for physical properties of rubber") of the DIN Standards Committee Materials Testing (NMP). This International Standard specifies a dead-load method for the determination of the hardness of very soft vulcanized or thermoplastic rubbers using the very low rubber hardness (VLRH) scale. The relation between the depth of penetration and the VLRH scale is linear. The hardness test consists of measuring the difference between the depths of indentation of a ball into the rubber under a small contact force and a large total force. From this difference, the hardness in "very low rubber hardness degrees" (VLRH) is obtained using Table A.1 (see Annex A) or graphs based on this table or a scale, reading directly in very low rubber hardness degrees, calculated from the tables and fitted to the indentation-measuring instrument.