ISO 7326:2016 ゴムおよびプラスチックホース—静的条件下での耐オゾン性の評価 | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, 2 (see www.iso.org/directives ).

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The committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee SC 1, Rubber and plastics hoses and hose assemblies.

This fourth edition cancels and replaces the third edition (ISO 7326:2006), which has been technically revised with the following changes:

• Clause 2, the latest edition of ISO 1431-1 has been cited;
• 5.5 and 9.4.1 have been amended;
• 6.1.1, the formula has been amended.

Introduction

The methods described in this document provide a means of assessing the resistance of hoses to the deleterious effects of atmospheric ozone under static conditions.

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 textile-reinforced hoses.

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.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 8330 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography