ISO 4045:2018 皮革—化学試験—pHと差の数値の決定 | ページ 2

Foreword

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This document was prepared by the Chemical Tests Commission of the International Union of Leather Technologists and Chemists Societies (IUC Commission, IULTCS) in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 289, Leather, the secretariat of which is held by UNI, in accordance with the agreement on technical cooperation between ISO and CEN (Vienna Agreement).

It is based on IUC 11 published in J. Soc. Leather Tech. Chem., 49 , pp. 25–29, 1965, and declared an official method of the IULTCS in 1965.

IULTCS, originally formed in 1897, is a world-wide organization of professional leather societies to further the advancement of leather science and technology. IULTCS has three Commissions, which are responsible for establishing international methods for the sampling and testing of leather. ISO recognizes IULTCS as an international standardizing body for the preparation of test methods for leather.

This third edition cancels and replaces the second edition (ISO 4045:2008), which has been technically revised as follows:

• change in title to include “and difference figure”;
• 5.1 and 6.1 have been revised;
• Clause 7 has been revised: two samples are only prepared when there is enough leather;
• 8.1 has been revised to more clearly explain the procedure;
• 8.2 has been added (previously part of the next clause);
• 8.3 and 8.4 (previously 8.2 and 8.3) have been revised and the previous title of 8.4 deleted;
• Clause 9 b) and d) have been revised.

1 Scope

This document specifies a method for determining the pH value and the difference figure of an aqueous leather extract. It is applicable to all types of leather.

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: