BS EN ISO 7326:2016 pdf download – Rubber and plastics hoses – Assessment of ozone resistance under static conditions (ISO 7326:2016) 1 Scope This document specifies five methods for determining the ozone resistance of the outer covers of hoses: -method 1, for bore sizes up to and including 25 mm, carried out on the hose itself; -method 2, for bore sizes greater than 25 mm, carried out on a test piece from the hose wall; -method 3, for bore sizes greater than 25 mm, carried out on a test piece from the cover; – method 4, for all bore sizes, carried out on the hose itself; – method 5, for all bore sizes, carried out on hoses that are expandable, for example textilereinforced hoses. NOTE  For hoses with built-in fittings from which it is not possible to take test pieces, the ozone resistance can be assessed on slabs in accordance with ISO 1431-1, using test sheets of the appropriate polymeric compound vulcanized to the same degree. 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 1431-1:2012, Rubber, vulcanized or thermoplastic – Resistance to ozone cracking一Part 1: Static and dynamic strain testing ISO 23529, Rubber – – General procedures for preparing and conditioning test pieces for physical test methods 3 Terms and definitions For the purposes of this document, the terms and definitions given in IS0 8330 apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: -IEC Electropedia: available at http://www.electropedia.org/ -IS0 Online browsing platform: available at ht://ww.isw.org/obep 4 General considerations Method 1 and method 2 are the methods normally used, method 3 being used only if it is not possible to carry out the test in accordance with method 2. Method 4 is suitable for all bore sizes. Method 5 is specifically for testing expandable hoses in the expanded state. The results of tests carried out in accordance with method 1 may not be comparable with the results obtained when tests are carried out in accordance with method 2 or method 3, even if the cover compounds of the hoses under test are identical in composition and are cured to the same...

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