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      • Home
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      • Paper Technology
      • Pulps
      • ISO 6588-1:2021

      Codes & Standards - Purchase

      ISO 6588-1:2021

      Paper, board and pulps — Determination of pH of aqueous extracts — Part 1: Cold extraction
      SKU: iso_083250_179510 Published by ISO Publication Year 2021 4 Edition 7 pages

      Product Details

      • Overview
      This document specifies a method for the determination of the pH-value defined by the electrolytes extractable by cold water from a sample of paper, board or pulp.
      This document is applicable to all types 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 can sometimes be different (e.g. for fully bleached pulp) from the pH-value measured under mill process conditions, in which various types of process waters, such as 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 gives 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[5].

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      GST REG No R119441681
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