ISO 2782-1:2016 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—パート1：差圧法 | ページ 2

Foreword

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The committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee SC 2, Testing and analysis.

This second edition cancels and replaces the first edition (ISO 2782-1:2012), which has been technically revised. A new Clause on simplified pressure sensor method has been added (see Clause 6).

ISO 2782 consists of the following parts, under the general title Rubber, vulcanized or thermoplastic — Determination of permeability to gases:

• Part 1: Differential-pressure methods
• Part 2: Equal-pressure method

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 part of ISO 2782 proposes three different methods for the determination of the permeability to gases of vulcanized or thermoplastic rubber under a differential partial pressure, which are

• pressure sensor method which allows a complete characterization of a material,
• simplified pressure sensor method which is appropriate when only the gas permeability coefficient is needed (routine control, specification verification, design, etc.), and
• gas-chromatographic method.

1 Scope

This part of ISO 2782 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:

• pressure sensor method (using vacuum): for determining the gas transmission rate, gas permeability coefficient, gas diffusion coefficient and gas solubility coefficient;
• simplified sensor method (using applied pressure): for determining the gas permeability coefficient only;
• 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, in whole or in part, are normatively referenced in this document and are indispensable for its application. 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.