EN ISO 3071:2020

Textiles - Determination of pH of aqueous extract (ISO 3071:2020)

This document specifies a method for determining the pH of the aqueous extract of textiles. The method is applicable to textiles in any form (e.g. fibres, yarns, fabrics).

Textilien - Bestimmung des pH des wässrigen Extraktes (ISO 3071:2020)

Dieses Dokument legt ein Verfahren zur Bestimmung des pH Werts des wässrigen Extraktes von Textilien fest. Das Verfahren ist anzuwenden für Textilien jeder Art (z. B. Fasern, Garne, textile Flächengebilde).

Textiles - Détermination du pH de l'extrait aqueux (ISO 3071:2020)

Le présent document spécifie une méthode de détermination du pH de l'extrait aqueux des textiles. Cette méthode est applicable à toutes formes de textiles (par exemple fibres, fils, étoffes).

Tekstilije - Ugotavljanje pH vodnega ekstrakta (ISO 3071:2020)

General Information

• Status: Published
• Publication Date: 11-Feb-2020
• Withdrawal Date: 30-Aug-2020
• ICS: 59.080.01 - Textiles in general
• Technical Committee: CEN/TC 248 - Textiles and textile products
• Drafting Committee: CEN/TC 248/WG 26 - Methods of test for phthalates
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 12-Feb-2020
• Completion Date: 12-Feb-2020
• Ref Project: SIST EN ISO 3071:2020 - Textiles - Determination of pH of aqueous extract (ISO 3071:2020)

Relations

• Replaces: EN ISO 3071:2006 - Textiles - Determination of pH of aqueous extract (ISO 3071:2005)
• Effective Date: 04-Oct-2017

Overview

EN ISO 3071:2020 - Textiles: Determination of pH of aqueous extract (ISO 3071:2020) specifies a standardized laboratory method to measure the pH of the aqueous extract of textiles. It applies to textiles in any form (fibres, yarns, fabrics) and defines reagents, apparatus, specimen preparation, extraction and electrometric measurement using a glass electrode. The method is intended for consistent pH testing across quality control, regulatory and conformity-assessment activities.

Key topics and technical requirements

• Scope: pH measurement of an aqueous extract prepared from textile test specimens (applicable to all textile forms).
• Specimens: Cut representative sample pieces ~5 mm sides; take two test specimens of (2.00 ± 0.05) g each.
• Extracting solution: 0.1 mol/l potassium chloride (KCl) is specified as the extracting medium (water as extracting solution was omitted in this edition).
• Extraction procedure: Place specimen + 100 ml KCl solution in a stoppered flask; mechanically shake (reciprocating or rotational) for 2 h ± 5 min.
• pH measurement: Use a pH‑meter with glass electrode (resolution at least 0.01 pH units). Calibrate at the extract temperature using buffer solutions (recommended pH ~4, 7 and 9). Immerse electrode ≥10 mm; perform two measurements from two extracts and calculate mean.
• Reporting precision: Report the mean pH to the nearest 0.1 pH-unit. Interlaboratory reproducibility reported as R = 1.1 pH-units (using KCl extracting solution).
• Reagents & apparatus: Requires grade 3 distilled/deionized water (ISO 3696), KCl solution, standard buffer solutions (preparation described in Annex A), chemically resistant glassware, mechanical shaker, balance, volumetric flask.
• Test report content: Must reference ISO 3071:2020 and include mean pH, pH and temperature of the extracting solution, any factors affecting results (e.g., wetting resistance), and test date.

Practical applications

• Routine quality control of textile processing (dyeing, finishing) to detect residual acidity/alkalinity.
• Product safety and compliance where pH limits are specified by buyers, retailers or regulations.
• Troubleshooting manufacturing issues related to processing chemicals.
• Comparative testing in research, certification testing and supplier verification.

Who uses this standard

• Textile testing laboratories and QC departments
• Textile manufacturers, converters and finishers
• Certification and conformity-assessment bodies
• Textile chemists and R&D teams

Related standards

• ISO 3696 - Water for analytical laboratory use (reagent water quality)
• ISO 5725-2 - Precision of measurement methods (used for interlaboratory statistics)
• Annex A of ISO 3071:2020 - preparation of standard buffer solutions

This standard ensures consistent, reproducible measurement of textile extract pH, improving comparability across laboratories and supporting product quality and regulatory compliance.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2020
Nadomešča:
SIST EN ISO 3071:2006
Tekstilije - Ugotavljanje pH vodnega ekstrakta (ISO 3071:2020)
Textiles - Determination of pH of aqueous extract (ISO 3071:2020)
Textilien - Bestimmung des pH des wässrigen Extraktes (ISO 3071:2020)
Textiles - Détermination du pH de l'extrait aqueux (ISO 3071:2020)
Ta slovenski standard je istoveten z: EN ISO 3071:2020
ICS:
59.080.01 Tekstilije na splošno Textiles in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 3071
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2020
EUROPÄISCHE NORM
ICS 59.080.01 Supersedes EN ISO 3071:2006
English Version
Textiles - Determination of pH of aqueous extract (ISO
3071:2020)
Textiles - Détermination du pH de l'extrait aqueux (ISO Textilien - Bestimmung des pH des wässrigen
3071:2020) Extraktes (ISO 3071:2020)
This European Standard was approved by CEN on 7 January 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 3071:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 3071:2020) has been prepared by Technical Committee ISO/TC 38 "Textiles" in
collaboration with Technical Committee CEN/TC 248 “Textiles and textile products” the secretariat of
which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by August 2020, and conflicting national standards shall
be withdrawn at the latest by August 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 3071:2006.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 3071:2020 has been approved by CEN as EN ISO 3071:2020 without any modification.

INTERNATIONAL ISO
STANDARD 3071
Fourth edition
2020-01
Textiles — Determination of pH of
aqueous extract
Textiles — Détermination du pH de l'extrait aqueux
Reference number
ISO 3071:2020(E)
©
ISO 2020
ISO 3071:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 3071:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 1
6 Apparatus . 2
7 Preparation of test specimens . 2
8 Procedure. 2
8.1 Preparation of the aqueous extract . 2
8.2 Measurement of the pH of the aqueous extract . 2
9 Calculation . 3
10 Precision . 3
11 Test report . 3
Annex A (informative) Preparation of standard buffer solutions . 4
Bibliography . 5
ISO 3071:2020(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Dir
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