ISO 2782-1:2022 ゴム、加硫または熱可塑性プラスチック—ガスの透過性の測定— Part 1: 差圧法 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 2, Testing and analysis.

This third edition cancels and replaces the second edition (ISO 2782-1:2016), of which it constitutes a minor revision.

The main changes are as follows:

• editorially revised to update references.
• editorially revised to take into account the updated ISO/IEC Directives, 2.

Introduction

The measurement of the permeability of rubber to gases is important in the evaluation of compounds for products such as inner tubes, tubeless-tyre liners, hoses, balloons and other gas-containing products, as well as seals and diaphragms. The measurement is also of theoretical importance in the study of the characteristics of gas diffusion and gas solubility in relation to polymer structure.

This document proposes three different methods. The first one is the pressure sensor method which allows a complete characterization of a material. The second one is a simplified pressure sensor method which is appropriate when only the gas permeability coefficient is needed (e.g. routine control, specification verification, design). The third one is the gas-chromatographic method.

1 Scope

This document specifies three methods for the determination of the permeability to gases of vulcanized or thermoplastic rubber under a differential partial pressure.

The three methods specified are as follows:

• a pressure sensor method (using vacuum): for determining the gas transmission rate, gas permeability coefficient, gas diffusion coefficient and gas solubility coefficient;
• a simplified sensor method (using applied pressure): for determining the gas permeability coefficient only;
• a gas-chromatographic method: for determining the gas transmission rate and gas permeability coefficient.

These methods apply to vulcanized and thermoplastic rubbers of hardness not less than 35 IRHD (international rubber hardness degrees) and to both single gases and mixtures of gases.

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 following terms and definitions apply.

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