ISO 23649:2025 皮革なめし産業用の化学薬品 - シクロシロキサンの測定 | ページ 2

Foreword

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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 document was prepared by the Chemical Test 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, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

Introduction

This document includes a procedure for analysing certain cyclosiloxanes using gas chromatography (GC) with mass spectrometer (MS) equipment. With this analytical method octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5) and dodecamethylcyclohexasiloxane (D6) can be determined.

In the leather industry cyclosiloxanes (D4), (D5) and (D6) are used in the manufacture of silicone-based waterproofing fatliquors and can also be used in the production of silicone-based finishing chemicals especially as handle modifiers.

At present, the official classification recognised in the EU is the following.

• Octamethylcyclotetrasiloxane (D4) is classified as persistent, bioaccumulative and toxic.^[1]
• Decamethylcyclopentasiloxane (D5) is classified as persistent, bioaccumulative and toxic.^[2]
• Dodecamethylcyclohexasiloxane (D6) is classified as persistent, bioaccumulative and toxic.^[3]

1 Scope

This document specifies a method for determining the total content of the following cyclosiloxanes in chemicals for the leather tanning industry:

• octamethylcyclotetrasiloxane (D4);
• decamethylcyclopentasiloxane (D5);
• dodecamethylcyclohexasiloxane (D6);

This method requires the use of gas chromatography (GC) equipped with a single quadrupole mass spectrometer (MS) to identify and quantify the cyclosiloxanes.

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

No terms and definitions are listed in this document.

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

Bibliography