EN ISO 4629-2:2016

SLOVENSKI STANDARD
01-september-2016
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XSRUDERNDWDOL]DWRUMD,62
Binders for paints and varnishes - Determination of hydroxyl value - Part 2: Titrimetric
method using a catalyst (ISO 4629-2:2016)
Bindemittel für Beschichtungsstoffe - Bestimmung der Hydroxylzahl - Teil 2:
Titrimetrisches Verfahren mit Katalysator (ISO 4629-2:2016)
Liants pour peintures et vernis - Détermination de l'indice d'hydroxyle - Partie 2: Méthode
utilisant d'un catalyseur (ISO 4629-2:2016)
Ta slovenski standard je istoveten z: EN ISO 4629-2:2016
ICS:
87.060.20 Veziva Binders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 4629-2
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2016
EUROPÄISCHE NORM
ICS 87.060.20
English Version
Binders for paints and varnishes - Determination of
hydroxyl value - Part 2: Titrimetric method using a catalyst
(ISO 4629-2:2016)
Liants pour peintures et vernis - Détermination de Bindemittel für Beschichtungsstoffe - Bestimmung der
l'indice d'hydroxyle - Partie 2: Méthode titrimétrique Hydroxylzahl - Teil 2: Verfahren mit Katalysator (ISO
utilisant un catalyseur (ISO 4629-2:2016) 4629-2:2016)
This European Standard was approved by CEN on 19 May 2016.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4629-2:2016 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
European foreword
This document (EN ISO 4629-2:2016) has been prepared by Technical Committee ISO/TC 35 “Paints
and varnishes” in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” 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 December 2016, and conflicting national standards
shall be withdrawn at the latest by December 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 4629-2:2016 has been approved by CEN as EN ISO 4629-2:2016 without any
modification.
INTERNATIONAL ISO
STANDARD 4629-2
First edition
2016-06-01
Binders for paints and varnishes —
Determination of hydroxyl value —
Part 2:
Titrimetric method using a catalyst
Liants pour peintures et vernis — Détermination de l’indice
d’hydroxyle —
Partie 2: Méthode titrimétrique utilisant un catalyseur
Reference number
ISO 4629-2:2016(E)
©
ISO 2016
ISO 4629-2:2016(E)
© ISO 2016, Published in Switzerland
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ii © ISO 2016 – All rights reserved

ISO 4629-2:2016(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 2
6 Apparatus . 2
7 Sampling . 3
8 Procedure. 3
8.1 Number of determinations . 3
8.2 Test portion . 3
8.3 Determination . 3
8.4 Blank test . 4
8.5 Determination of acid value . 4
9 Expression of results . 4
10 Precision . 4
10.1 Repeatability . 4
10.2 Reproducibility . 4
11 Test report . 5
Bibliography . 6
ISO 4629-2:2016(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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 35, Paints and varnishes, Subcommittee SC 10,
Test methods for binders for paints and varnishes.
ISO 4629 consists of the following parts, under the general title Binders for paints and varnishes —
Determination of hydroxyl value:
— Part 1: Titrimetric method without using a catalyst
— Part 2: Titrimetric method using a catalyst
iv © ISO 2016 – All rights reserved

ISO 4629-2:2016(E)
Introduction
There are several different methods standardized for determining the hydroxyl value of resins. The
classic method using pyridine without a catalyst is specified in ISO 4629-1. The advantages of the
method using a catalyst are the following:
— the solvents used are less hazardous to health;
— the solvent consumption is lower;
— the method is faster due to shorter reaction times;
— the end point of the titration is easier to see;
— polyols are more readily soluble.
INTERNATIONAL STANDARD ISO 4629-2:2016(E)
Binders for paints and varnishes — Determination of
hydroxyl value —
Part 2:
Titrimetric method using a catalyst
1 Scope
This part of ISO 4629 specifies a titrimetric method for determining the hydroxyl value of resins,
binders for paints and varnishes, primary alcohols, glycols and fats. Whether it can be applied for
hydro carboxylic acids, phenolic hydroxyl groups, polyols such as trimethyl propane and substances
containing aromatic groups have been activated for Friedel-Crafts acylation shall be decided on case-
to-case basis.
Under the right conditions, the method is also applicable for determining the hydroxyl value of castor
oil and its derivatives.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) app
...