ISO 14897:2023 プラスチック — ポリウレタンの製造に使用されるポリオール — 水分含有量の測定 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC61, Plastics, Subcommittee SC12, Thermosetting materials.

This third edition cancels and replaces the second edition (ISO 14897:2002), of which it constitutes a minor revision.

The changes are as follows:

• the title has been changed to plural form to read:"Plastics — Polyols for use in the production of polyurethanes — Determination of water content".

Introduction

This method is for the determination of water content in polyether polyols, which are used in the preparation of polyurethane prepolymers and polyurethane products. Knowledge of this value is important to polyurethane production.

The document is based on ASTM D 4672.

1 Scope

This document specifies methods used to measure the water content of polyols employed as polyurethane raw materials.

Method A is a manual amperometric method which has been included to better define the principles of the Karl Fischer measurement. Amperometric methods are applicable to a wide range of polyols, including those which have enough colour to obscure a visual end-point. Method B includes an automated amperometric procedure and an automated coulometric procedure.

The coulometric procedure is an absolute method that does not require calibration and gives improved sensitivity compared with amperometric methods.

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 terminology databases for use in standardization at the following addresses:

Bibliography