EN ISO 2431:2011
(Main)Paints and varnishes - Determination of flow time by use of flow cups (ISO 2431:2011)
Paints and varnishes - Determination of flow time by use of flow cups (ISO 2431:2011)
ISO 2431:2011 specifies a method for determining the flow time of paints, varnishes and related products that can be used to control consistency.
Four flow cups of similar dimensions, but having orifice diameters of 3 mm, 4 mm, 5 mm and 6 mm, are specified. Two methods for checking the flow cups for wear and tear are given in an annex.
Flow cups with a replaceable jet are not covered by ISO 2431 as the close tolerances on the supply of the material under test to the jet are not met.
Commonly used dipping flow cups are also not covered by ISO 2431. In general, the fabrication tolerances for such flow cups are greater than those of the flow cups specified in ISO 2431. Therefore flow time determinations with dipping flow cups give a precision which is lower than that obtained with the flow cups specified in ISO 2431.
The method is limited to testing materials for which the breakpoint of the flow from the orifice of the flow cup can be determined with certainty. This point is difficult to determine and reproduce for materials with flow times near the upper limit of the measurement range (100 s) due to slowing-down effects.
Beschichtungsstoffe - Bestimmung der Auslaufzeit mit Auslaufbechern (ISO 2431:2011)
1.1 Diese Internationale Norm legt ein Verfahren zum Bestimmen der Auslaufzeit von Beschichtungsstoffen und ähnlichen Produkten fest, das zum Prüfen der Konsistenz angewendet werden kann. 1.2 Es werden vier Auslaufbecher mit ähnlichen Maßen, jedoch mit unterschiedlichen Düsendurchmessern von 3 mm, 4 mm, 5 mm und 6 mm festgelegt. Zur Überprüfung der Auslaufbecher auf Abnutzung werden zwei Verfahren angegeben (siehe Anhang A). Auslaufbecher mit auswechselbaren Düsen sind nicht Bestandteil dieser Internationalen Norm, da die engen Toleranzen der Auslaufdüsen nicht erfüllt werden. Die allgemein verwendeten Tauchauslaufbecher sind nicht Bestandteil dieser Internationalen Norm. Die Toleranzen bei der Herstellung solcher Auslaufbecher sind im Allgemeinen größer als die Toleranzen der in dieser Internationalen Norm festgelegten Auslaufbecher. Daher ergeben die mit Tauchauslaufbechern ermittelten Auslaufzeiten eine geringere als die in dieser Internationalen Norm festgelegte Präzision (siehe Abschnitt 9). 1.3 Das Verfahren ist auf die Prüfung von Stoffen, bei denen das Abreißen des aus der Düse des Auslaufbechers fließenden Flüssigkeitsfadens eindeutig festgestellt werden kann, begrenzt. Das Abreißen ist bei Stoffen mit Auslaufzeiten nahe der oberen Grenze des Messbereiches (100 s) wegen des langsamer werdenden Fließens schwierig festzustellen und zu reproduzieren.
Peintures et vernis - Détermination du temps d'écoulement au moyen de coupes d'écoulement (ISO 2431:2011)
L'ISO 2431:2011 spécifie une méthode de détermination du temps d'écoulement des peintures, vernis et produits assimilés, utilisable pour contrôler leur consistance.
Quatre coupes d'écoulement de dimensions semblables mais ayant des orifices de 3 mm, 4 mm, 5 mm et 6 mm de diamètres sont spécifiées. Deux méthodes permettant de vérifier l'usure et la détérioration des coupes d'écoulement sont données dans une annexe.
Les coupes d'écoulement à ajutage ajustable ne sont pas couvertes par l'ISO 2431:2011 en raison du fait que les tolérances étroites relatives à l'alimentation en matériau soumis à essai de l'ajutage ne sont pas respectées.
Les coupes d'écoulement par plongée couramment utilisées ne sont également pas couvertes par l'ISO 2431:2011. En général, les tolérances de fabrication de telles coupes d'écoulement sont supérieures à celles des coupes d'écoulement spécifiées dans l'ISO 2431:2011. Par conséquent, les déterminations de temps d'écoulement effectuées avec des coupes d'écoulement par plongée donnent une fidélité inférieure à celle obtenue avec les coupes d'écoulement spécifiées dans l'ISO 2431:2011.
La méthode est limitée aux essais sur des matériaux dont il est possible de déterminer avec certitude le point de rupture de l'écoulement à l'orifice de la coupe. Ce point de rupture est difficile à déterminer et à reproduire pour les matériaux dont le temps d'écoulement est proche de la limite supérieure de la plage de mesurage (100 s), en raison d'effets de ralentissement.
Barve in laki - Ugotavljanje iztočnega časa z uporabo iztočnih čaš (ISO 2431:2011)
Ta mednarodni standard določa metodo za ugotavljanje iztočnega časa barv, lakov in povezanih izdelkov, ki jo je mogoče uporabljati za nadzor konsistence. Določene so štiri iztočne čaše podobnih mer s premeri odprtin 3 mm, 4 mm, 5 mm in 6 mm. Opisani sta dve metodi za preverjanje obrabljenosti iztočnih čaš (glejte dodatek A). Ta mednarodni standard ne zajema iztočnih čaš z zamenljivo šobo, ker ozke tolerance za dovod preskušanega materiala v šobo niso dosežene. Prav tako ta mednarodni standard ne zajema pogosto uporabljenih potopnih iztočnih čaš. Na splošno so proizvodne tolerance za take iztočne čaše večje od toleranc iztočnih čaš iz tega mednarodnega standarda. Zato je ugotavljanje iztočnega časa s potopnimi iztočnimi čašami manj natančno od preskusov z iztočnimi čašami iz tega mednarodnega standarda (glejte točko 9). Metoda je omejena na preskušanje materialov, za katere je mogoče prekinitveno točko iztoka iz odprtine iztočne čaše natančno določiti. Za materiale z iztočnim časom blizu zgornje mejne vrednosti razpona merjenja (100 s) je to točko težko določiti, saj se rezultati zaradi upočasnjevanja običajno razlikujejo med ponovitvami.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2012
1DGRPHãþD
SIST EN ISO 2431:1997
SIST EN ISO 2431:1997/AC:2002
%DUYHLQODNL8JRWDYOMDQMHL]WRþQHJDþDVD]XSRUDERL]WRþQLKþDã ,62
Paints and varnishes - Determination of flow time by use of flow cups (ISO 2431:2011)
Beschichtungsstoffe - Bestimmung der Auslaufzeit mit Auslaufbechern (ISO 2431:2011)
Peintures et vernis - Détermination du temps d'écoulement au moyen de coupes
d'écoulement (ISO 2431:2011)
Ta slovenski standard je istoveten z: EN ISO 2431:2011
ICS:
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 2431
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2011
ICS 87.040 Supersedes EN ISO 2431:1996
English Version
Paints and varnishes - Determination of flow time by use of flow
cups (ISO 2431:2011)
Peintures et vernis - Détermination du temps d'écoulement Beschichtungsstoffe - Bestimmung der Auslaufzeit mit
au moyen de coupes d'écoulement (ISO 2431:2011) Auslaufbechern (ISO 2431:2011)
This European Standard was approved by CEN on 26 November 2011.
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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 2431:2011: E
worldwide for CEN national Members.
Contents Page
Foreword .3
Foreword
This document (EN ISO 2431:2011) 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 May 2012, and conflicting national standards shall be withdrawn at the
latest by May 2012.
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.
This document supersedes EN ISO 2431:1996.
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, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 2431:2011 has been approved by CEN as a EN ISO 2431:2011 without any modification.
INTERNATIONAL ISO
STANDARD 2431
Fifth edition
2011-11-15
Paints and varnishes — Determination of
flow time by use of flow cups
Peintures et vernis — Détermination du temps d’écoulement au moyen
de coupes d’écoulement
Reference number
ISO 2431:2011(E)
©
ISO 2011
ISO 2431:2011(E)
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s
member body in the country of the requester.
ISO copyright office
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Published in Switzerland
ii © ISO 2011 – All rights reserved
ISO 2431:2011(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Temperature considerations . 2
5 Apparatus . 2
5.1 Flow cups . 2
5.2 Supplementary apparatus . 5
6 Sampling . 6
7 Procedure . 6
7.1 Preliminary check for Newtonian flow . 6
7.2 Determination of flow time . 6
8 Marking of products tested . 7
9 Precision . 7
9.1 General . 7
9.2 Repeatability limit � . 8
9.3 Reproducibility limit � . 8
10 Test report . 8
Annex A (normative) Checking flow cups for wear and tear .10
Annex B (informative) Conversion of flow times from one temperature to another .12
Bibliography .15
ISO 2431:2011(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 2431 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9,
General test methods for paints and varnishes.
This fifth edition cancels and replaces the fourth edition (ISO 2431:1993), which has been technically revised.
It also incorporates the Technical Corrigenda ISO 2431:1993/Cor.1:1994 and ISO 2431:1993/Cor.2:1999.
The main technical changes are as follows:
a) the curves in Figures 2 to 5 have been placed in a single figure (Figure 2) and the equations for the
conversion of flow time to kinematic viscosity and vice versa represented by the curves in these figures
have been moved from the figures to a table (Table 1);
b) the accuracy of the stopwatch used is no longer specified;
c) a clause has been added describing the marking of products tested to indicate the results of the test;
d) the procedure for checking the flow cups for wear and tear has been revised to include two alternative
methods (one using a certified reference material or secondary working standard, the other using a
certified flow cup) and has been moved to an informative annex;
e) the former Annex A on the use of flow cups for the adjustment of paint consistency has been deleted;
f) a new annex describing the conversion of flow times from one temperature to another has been added.
iv © ISO 2011 – All rights reserved
ISO 2431:2011(E)
Introduction
The first edition of this International Standard, published in 1972, specified only one flow cup of orifice diameter
4 mm. The second edition specified three flow cups of orifice diameter 3 mm, 4 mm and 6 mm. The third edition
corrected errors in Figures 2 and 4 and the equations for those figures. The fourth edition specified four flow
cups of orifice diameter 3 mm, 4 mm, 5 mm and 6 mm. The main changes made in this fifth edition are given
in the foreword.
As is well known, many countries over the years have developed their own standard flow cups and the difficulty
in correlation between them has led to considerable confusion in comparing values. The standardization of an
improved design of flow cup has been recommended after careful consideration, by an expert working group,
of the role of flow cups for the measurement of the flow time of paints, varnishes and related products.
It is recognized that flow times are reproducible only for products of Newtonian or near-Newtonian flow
properties. This effectively limits their practical use. Nevertheless, for checking purposes, these flow cups do
serve a useful purpose. Furthermore, the measurement of flow time is often used to confirm the application
consistency.
Paints often contain flow-arresting agents to confer increased viscosity. Such paints exhibit non-Newtonian
flow properties. Their viscosity during application can only be properly assessed using viscometers such as
that described in ISO 3219.
Resins and varnishes can exhibit Newtonian or near-Newtonian flow at much higher viscosities than most
paints and, where this applies, flow cups can provide a useful means of controlling the consistency. To meet
this requirement, this International Standard provides flow cups suitable for viscosities up to about 700 mm /s.
With thixotropic materials, stirring or other such mechanical disturbance immediately before testing will reduce
the flow time compared with that for an unstirred sample. With such materials, uncertain and variable flow time
values are obtained with all the flow cups. The repeatability and reproducibility limits given in Clause 9 cannot
be achieved in the determination of the flow time of such materials.
INTERNATIONAL STANDARD ISO 2431:2011(E)
Paints and varnishes — Determination of flow time by use of
flow cups
1 Scope
1.1 This International Standard specifies a method for determining the flow time of paints, varnishes and
related products that can be used to control consistency.
1.2 Four flow cups of similar dimensions, but having orifice diameters of 3 mm, 4 mm, 5 mm and
...
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