EN ISO 9455-3:2020

SLOVENSKI STANDARD
01-september-2020
Nadomešča:
SIST EN ISO 9455-3:2001
Talila za mehko spajkanje - Preskusne metode - 3. del: Določevanje kislinskega
števila s potenciometrično in vizualno titracijo (ISO 9455-3:2019)
Soft soldering fluxes - Test methods - Part 3: Determination of acid value, potentiometric
and visual titration methods (ISO 9455-3:2019)
Flussmittel zum Weichlöten - Prüfverfahren - Teil 3: Bestimmung des Säurewertes,
potentiometrische und visuelle Titrationsmethoden (ISO 9455-3:2019)
Flux de brasage tendre - Méthodes d'essai - Partie 3: Détermination de l'indice d'acide
par des méthodes de titrage potentiométrique et visuel (ISO 9455-3:2019)
Ta slovenski standard je istoveten z: EN ISO 9455-3:2020
ICS:
25.160.50 Trdo in mehko lotanje Brazing and soldering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 9455-3
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2020
EUROPÄISCHE NORM
ICS 25.160.50 Supersedes EN ISO 9455-3:1994
English Version
Soft soldering fluxes - Test methods - Part 3:
Determination of acid value, potentiometric and visual
titration methods (ISO 9455-3:2019)
Flux de brasage tendre - Méthodes d'essai - Partie 3: Flussmittel zum Weichlöten - Prüfverfahren - Teil 3:
Détermination de l'indice d'acide par des méthodes de Bestimmung des Säurewertes, potentiometrische und
titrage potentiométrique et visuel (ISO 9455-3:2019) visuelle Titrationsmethoden (ISO 9455-3:2019)
This European Standard was approved by CEN on 10 April 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 9455-3:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 9455-3:2020) has been prepared by Technical Committee ISO/TC 44 "Welding
and allied processes" in collaboration with Technical Committee CEN/TC 121 “Welding and allied
processes” the secretariat of which is held by DIN.
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 November 2020, and conflicting national standards
shall be withdrawn at the latest by November 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 9455-3:1994.
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 9455-3:2019 has been approved by CEN as EN ISO 9455-3:2020 without any
modification.
INTERNATIONAL ISO
STANDARD 9455-3
Second edition
2019-09
Soft soldering fluxes — Test
methods —
Part 3:
Determination of acid value,
potentiometric and visual titration
methods
Flux de brasage tendre — Méthodes d'essai —
Partie 3: Détermination de l'indice d'acide par des méthodes de
titrage potentiométrique et visuel
Reference number
ISO 9455-3:2019(E)
©
ISO 2019
ISO 9455-3:2019(E)
© ISO 2019
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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Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
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Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 9455-3:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Method A: Potentiometric titration method . 1
4.1 Principle . 1
4.2 Reagents. 1
4.3 Apparatus . 2
4.4 Procedure . 2
4.4.1 General. 2
4.4.2 Manual procedure . 2
4.4.3 Automated procedure. 3
4.5 Calculation of results . 3
5 Method B — Titration method with visual end‑point . 3
5.1 Principle . 3
5.2 Reagents. 4
5.3 Apparatus . 4
5.4 Procedure . 4
5.5 Calculation of results . 5
6 Precision . 5
6.1 Method A . 5
6.2 Method B . 5
7 Test report . 5
Bibliography . 6
ISO 9455-3:2019(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 Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 44, Welding and allied processes,
Subcommittee SC 12, Soldering materials.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
Official interpretations of TC 44 documents, where they exist, are available from this page: https:
//committee .iso .org/sites/tc44/home/interpretation .html.
This second edition cancels and replaces the first edition (ISO 9455-3:1992), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— the automated titration procedure has been added to 4.4;
— the document has been editorially aligned with the current Directives, Part 2.
A list of all parts in the ISO 9455 series can be found on the ISO website.
iv © ISO 2019 – All rights reserved

INTERNATIONAL STANDARD ISO 9455-3:2019(E)
Soft soldering fluxes — Test methods —
Part 3:
Determination of acid value, potentiometric and visual
titration methods
1 Scope
This document specifies two methods for the determination of the acid value of a flux of types 1 and 2
only, as defined in ISO 9454-1.
Method A is a potentiometric titration method and is to be considered as the reference method.
Method B is an alternative, visual end-point, titration method.
2 Normative reference
...