ISO 9932:2021 紙と板紙—シート材料の水蒸気透過率の決定—動的掃引法と静的ガス法 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 6, Paper, board and pulps, Subcommittee SC 2, Test methods and quality specifications for paper and board.

This second edition cancels and replaces the first edition (ISO 9932:1990), of which it constitutes a minor revision. The changes compared to the previous edition are as follows:

• update of the normative references;
• removal of footnotes listing instruments in Clauses 4 and 5;
• addition of a general statement of the precision.

Introduction

The rate of water vapour penetration through a barrier is an important property in many applications, for example, in building and in packaging. ISO 2528 describes a dish method for the determination of the transmission rate and this method has wide acceptance. It does, however, have three disadvantages. Results take several days to obtain, it is not suitable for transmission rates less than 1 g/(m²·d) and it is not recommended for materials thicker than 3 mm.

The methods described in this document can, depending on the material being tested, produce results in a matter of hours and are suitable for materials with transmission rates considerably less than 1 g/(m²·d). Depending on the specific apparatus, they are also suitable for materials up to 38 mm thick.

1 Scope

This document describes general test methods for determining the water vapour transmission rate of sheet materials by means of a dynamic gas method or a static gas method. Depending on the method and specific apparatus employed, materials up to 38 mm thick and with water vapour transmission rates in the range from 0,05 g/(m²·d) to 65 g/(m²·d) can be tested. The basis of the function of the instrumental techniques is briefly described. Advice on calibration is given in Annex B.

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 terminological databases for use in standardization at the following addresses:

Bibliography