ISO 6588-2:2020

Paper, board and pulps — Determination of pH of aqueous extracts — Part 2: Hot extraction ISO 6588-2:2020

Publication date:   Mar 4, 2020

95.99 Withdrawal of Standard   Nov 23, 2021

General information

95.99 Withdrawal of Standard   Nov 23, 2021

ISO

ISO/TC 6 Paper, board and pulps

International Standard

85.040   Pulps | 85.060   Paper and board

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Scope

This document specifies a method for the determination of the pH-value defined by the electrolytes extractable by hot water from a sample of paper, board or pulp.
This document is applicable to all kinds of paper, board and pulp.
As the quantity of extractable ionic material approaches zero, as in the case of highly purified pulps, the precision of the method becomes poor because of the difficulties encountered in making pH measurements on water containing little electrolytic material.
Since the extraction in this document is performed with distilled or deionised water, the pH-value measured will sometimes be different (e.g. fully bleached pulp) from the pH-value measured under mill process conditions in which various types of process waters, e.g. chemically treated river water containing electrolytes, are used. In such cases, ISO 29681 can be used instead, as it is specifically applicable to bleached pulps from virgin fibres and to pulp samples having a low ionic strength for which the pH value will give more realistic results related to mill conditions than those obtained with this document. For cellulosic papers used for electrical purposes, the method used can be that given in IEC 60554-2[4].

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 6588-2:2012

NOW

WITHDRAWN
ISO 6588-2:2020
95.99 Withdrawal of Standard
Nov 23, 2021

REVISED BY

PUBLISHED
ISO 6588-2:2021