EN ISO 4629-3:2020
(Main)Binders for paints and varnishes - Determination of hydroxyl value - Part 3: Rapid test (ISO 4629-3:2018)
Binders for paints and varnishes - Determination of hydroxyl value - Part 3: Rapid test (ISO 4629-3:2018)
This document specifies a titrimetric method for determining the hydroxyl groups in resins and binders for paints and varnishes.
This method is primarily suitable for neutral media. Acidic products provide higher values; neutral products provide, through neutralization of the acidic carbamates, lower values. For these products, preliminary tests are performed to ensure the applicability of the method.
Bindemittel für Beschichtungsstoffe - Bestimmung der Hydroxylzahl - Teil 3: Schnellverfahren (ISO 4629-3:2018)
Liants pour peintures et vernis - Détermination de l'indice d'hydroxyle - Partie 3: Méthode rapide (ISO 4629-3:2018)
Le présent document spécifie une méthode titrimétrique pour le dosage des groupes hydroxyle libres dans les résines et liants pour peintures et vernis.
Cette méthode est principalement adaptée aux milieux neutres. Les produits acides donnent des valeurs plus élevées; les produits neutres donnent, par la neutralisation des acides carbamiques, des valeurs plus faibles. Pour ces produits, des essais préliminaires sont réalisés afin de garantir l'applicabilité de la méthode
Veziva za barve in lake - Določevanje hidroksilnega števila - 3. del: Hitri preskus (ISO 4629-3:2018)
General Information
Overview
EN ISO 4629-3:2020 specifies a rapid titrimetric method for the determination of hydroxyl values in binders and resins used for paints and varnishes. This standard is published by CEN based on the International Standard ISO 4629-3:2018, and targets the efficient and accurate measurement of hydroxyl groups in neutral media. It is primarily applied to neutral products, with special considerations noted for acidic binders that may yield higher hydroxyl values.
The standard covers sample preparation, reagent requirements, and an automated titration process using tetrabutylammonium hydroxide (TBAOH), providing a more streamlined alternative to traditional time-consuming methods involving hazardous reagents like pyridine. This method enhances safety and allows for faster results without sacrificing accuracy.
Key Topics
Scope and Applicability
The method is designed for binders and resins in paints and varnishes, focusing on neutral media. Preliminary testing is recommended for acidic products because they can influence hydroxyl value results differently.Rapid Titrimetric Process
Hydroxyl groups in the sample react with toluene-4-sulfonyl-isocyanate forming acidic carbamate groups. These carbamates are then titrated potentiometrically using TBAOH in an organic solvent, avoiding aqueous solutions and enabling non-aqueous titration.Sample Preparation and Reaction Conditions
Samples ranging from 1 g to 15 g are dissolved in toluene and acetonitrile, heated to 30-35°C, then reacted with the reagent solution. After a short reaction time and hydrolysis of excess reagent, titration proceeds under controlled conditions.Calculation of Hydroxyl Value
The hydroxyl value (HV) is calculated in milligrams of potassium hydroxide (KOH) per gram of sample based on the volume of titrant consumed between two endpoints, the concentration of the titrant, and sample mass.Reagents and Equipment
- Tetrabutylammonium hydroxide (TBAOH) solution in isopropanol/methanol
- Reaction solution of toluene-4-sulfonyl-isocyanate in acetonitrile
- HPLC-grade acetonitrile
- Standard laboratory glassware and potentiometric titration apparatus
Precision and Reporting
No specific precision data is currently available, but thorough test reports are mandatory, including details of the tested product, method references, test results, deviations, and examination dates.
Applications
Paints and Varnishes Quality Control
Ensuring the correct hydroxyl value in binders and resins is critical for formulation consistency, performance, and durability of paint and varnish products.Raw Material Characterization
This method enables manufacturers to rapidly assess the hydroxyl functionality of raw materials to maintain product specifications.Research and Development
During new product formulation, quick determination of hydroxyl numbers assists in optimizing binder properties and compatibility with other formulation components.Process Monitoring
The rapid test supports in-process monitoring in industrial settings, minimizing downtime and accelerating decision-making related to coating quality.
Related Standards
ISO 4629-1:2016
Titrimetric determination of hydroxyl value without using a catalyst; provides a traditional method for hydroxyl measurement.ISO 4618
Terms and definitions relevant to paints, varnishes, binders, and related materials, ensuring consistent terminology usage.ISO 3696
Specifies requirements for water purity used in analytical laboratory processes, relevant for ensuring reagent quality.ISO 15528
Standard for sampling paints, varnishes, and raw materials, which supports proper test specimen preparation.
Keywords: hydroxyl value determination, binders for paints, varnishes, titrimetric method, rapid test, toluene-4-sulfonyl-isocyanate, tetrabutylammonium hydroxide, paint quality control, resin analysis, non-aqueous titration, EN ISO 4629-3, CEN paint standards.
Frequently Asked Questions
EN ISO 4629-3:2020 is a standard published by the European Committee for Standardization (CEN). Its full title is "Binders for paints and varnishes - Determination of hydroxyl value - Part 3: Rapid test (ISO 4629-3:2018)". This standard covers: This document specifies a titrimetric method for determining the hydroxyl groups in resins and binders for paints and varnishes. This method is primarily suitable for neutral media. Acidic products provide higher values; neutral products provide, through neutralization of the acidic carbamates, lower values. For these products, preliminary tests are performed to ensure the applicability of the method.
This document specifies a titrimetric method for determining the hydroxyl groups in resins and binders for paints and varnishes. This method is primarily suitable for neutral media. Acidic products provide higher values; neutral products provide, through neutralization of the acidic carbamates, lower values. For these products, preliminary tests are performed to ensure the applicability of the method.
EN ISO 4629-3:2020 is classified under the following ICS (International Classification for Standards) categories: 87.040 - Paints and varnishes; 87.060.20 - Binders. The ICS classification helps identify the subject area and facilitates finding related standards.
You can purchase EN ISO 4629-3:2020 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2020
Veziva za barve in lake - Določevanje hidroksilnega števila - 3. del: Hitri preskus
(ISO 4629-3:2018)
Binders for paints and varnishes - Determination of hydroxyl value - Part 3: Rapid test
(ISO 4629-3:2018)
Bindemittel für Beschichtungsstoffe - Bestimmung der Hydroxylzahl - Teil 3:
Schnellverfahren (ISO 4629-3:2018)
Liants pour peintures et vernis - Détermination de l'indice d'hydroxyle - Partie 3: Méthode
rapide (ISO 4629-3:2018)
Ta slovenski standard je istoveten z: EN ISO 4629-3:2020
ICS:
87.060.20 Veziva Binders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 4629-3
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2020
EUROPÄISCHE NORM
ICS 87.060.20
English Version
Binders for paints and varnishes - Determination of
hydroxyl value - Part 3: Rapid test (ISO 4629-3:2018)
Liants pour peintures et vernis - Détermination de Bindemittel für Beschichtungsstoffe - Bestimmung der
l'indice d'hydroxyle - Partie 3: Méthode rapide (ISO Hydroxylzahl - Teil 3: Schnellverfahren (ISO 4629-
4629-3:2018) 3:2018)
This European Standard was approved by CEN on 19 July 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 4629-3:2020 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
The text of ISO 4629-3:2018 has been prepared by Technical Committee ISO/TC 35 "Paints and
varnishes” of the International Organization for Standardization (ISO) and has been taken over as
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 March 2021, and conflicting national standards shall
be withdrawn at the latest by March 2021.
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.
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 4629-3:2018 has been approved by CEN as EN ISO 4629-3:2020 without any
modification.
INTERNATIONAL ISO
STANDARD 4629-3
First edition
2018-10
Binders for paints and varnishes —
Determination of hydroxyl value —
Part 3:
Rapid test
Liants pour peintures et vernis — Détermination de l'indice
d'hydroxyle —
Partie 3: Méthode rapide
Reference number
ISO 4629-3:2018(E)
©
ISO 2018
ISO 4629-3:2018(E)
© ISO 2018
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ii © ISO 2018 – All rights reserved
ISO 4629-3:2018(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 . 2
8 Procedure. 2
9 Expression of results . 3
10 Precision . 3
11 Test report . 3
Bibliography . 4
...
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