BS ISO 6502-3:2018 pdf download – Rubber — Measurement of vulcanization characteristics using curemeters Part 3: Rotorless curemeter 1 Scope This document specifies a method for determining selected vulcanization characteristics of a rubber compound by means of a rotorless curemeter. The introduction to the use of curemeters is given in ISO 6502‑1. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6502‑1:2018, Rubber — Measurement of vulcanization characteristics using curemeters — Part 1: Introduction ISO 18899:2013, Rubber — Guide to the calibration of test equipment 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 6502‑1 apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at http://www.electropedia.org/ 4 Principle A test piece of rubber is placed in a heated cavity formed by two dies, one of which is oscillated at a given frequency and amplitude. This action exerts a shear strain on the test piece and a shear torque which depends on the stiffness (shear modulus) of the rubber. The torque that increases as vulcanization proceeds is measured by a torque sensor incorporated in the other die member. The torque is recorded autographically as a function of time. The stiffness of the rubber test piece increases as vulcanization proceeds. The curve is complete when the recorded torque rises either to an equilibrium value or to a maximum value (see ISO 6502‑1). If the torque continues to increase, vulcanization is considered to be complete after a given time. The time required to obtain a vulcanization curve is a function of the test temperature and the characteristics of the rubber compound. The vulcanization characteristics are obtained from the recorded curve of torque as a function of time, in accordance with ISO 6502‑1. 5 Apparatus 5.1 General A rotorless curemeter consists of two dies that are heated and closed or almost closed, under a specified force, to form a test cavity that contains a test piece. One of the dies oscillates, and reaction torque on the stationary die, which is opposite to the moving die, can...
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