ISO 787-14:2019 顔料と増量剤の一般的な試験方法—パート14：水性抽出物の抵抗率の決定 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 256, Pigments, dyestuffs and extenders.

This third edition cancels and replaces the second edition (ISO 787-14:2002), which has been technically revised. The main changes compared to the previous edition are as follows:

• Clause 3, a reference to ISO 18451-1 has been added;
• methanol as wetting agent has been replaced by ethanol;
• the former Clause 6 “Determination of cell constant” including Figure 1 has been replaced by Clause 7 “Preparation of conductivity meter”;
• the procedure has been replaced by a new method: it is no longer distinguished between hydrophilic and hydrophobic pigments;
• the text has been editorially revised and the normative references has been updated.

A list of all parts in the ISO 787 series can be found on the ISO website.

1 Scope

This document specifies a general method of test for determining the electric resistivity (specific electric resistance) or the specific electric conductivity, respectively, of the aqueous extract of a pigment. The method is applicable to all pigments and extenders, except pigments that are soluble in water.

The resistivity of the aqueous extract of a pigment is considered as a property independent of the amount of water-soluble matter. If agreed, a cold extraction method can be used.

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 18451-1 apply.

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