EN ISO 7231:2023
(Main)Polymeric materials, cellular, flexible - Determination of air flow value at constant pressure-drop (ISO 7231:2023)
Polymeric materials, cellular, flexible - Determination of air flow value at constant pressure-drop (ISO 7231:2023)
This document specifies two methods for determining the air flow value of flexible cellular polymeric materials:
— method A, for conventional types of flexible cellular polymeric material;
— method B, for all types of flexible cellular polymeric material, but especially for materials with a low permeability to air.
For method B, two methods are specified in this document:
— method B1: with manual measurement;
— method B2: with automatic measurement.
NOTE 1 Air flow values can be used to give an indication of the effects of formulation and production variables on the cellular structure.
NOTE 2 In this document, the expression “conventional type of flexible cellular polymeric material” means types which are unsuitable for sealing purposes.
Weich-elastische Polymerschaumstoffe - Bestimmung der Luftdurchlässigkeit bei konstantem Differenzdruck (ISO 7231:2023)
Dieses Dokument legt zwei Verfahren zur Bestimmung der Luftdurchlässigkeit( swerte) von weich-elastischen Polymerschaumstoffen fest:
Verfahren A für die herkömmlichen Typen weich-elastischer Polymerschaumstoffe;
Verfahren B für alle Arten weich-elastischer Polymerschaumstoffe, jedoch insbesondere für Materialien mit geringer Luftdurchlässigkeit.
Für Verfahren B sind in diesem Dokument zwei Verfahren festgelegt:
Verfahren B1: mit manuellem Messverfahren;
Verfahren B2: mit automatischem Messverfahren.
ANMERKUNG 1 Luftdurchlässigkeitswerte können als Anhaltspunkt für den Einfluss von Rezeptur und Herstellungsvariablen auf die Zellstruktur verwendet werden.
ANMERKUNG 2 In diesem Dokument steht der Ausdruck „herkömmlicher Typ weich-elastischer Polymerschaumstoffe“ für Typen, die nicht zum Abdichten geeignet sind.
WARNUNG — Die Anwender dieses Dokuments sollten mit der üblichen Laborpraxis vertraut sein. Dieses Dokument erhebt nicht den Anspruch, sämtliche mit seiner Anwendung verbundenen Sicherheitsprobleme, soweit diese gegeben sind, zu behandeln. Es liegt in der Verantwortung des Anwenders, angemessene Maßnahmen in Bezug auf die Sicherheit und den Gesundheitsschutz einzuleiten und die Anwendbarkeit jeglicher nationalen gesetzlichen Vorschriften zu bestimmen.
Matériaux polymères alvéolaires souples - Détermination de l'indice d'écoulement d'air à chute de pression constante (ISO 7231:2023)
Le présent document spécifie deux méthodes de détermination de l’indice d’écoulement d’air des matériaux polymères alvéolaires souples:
— méthode A, pour les matériaux polymères alvéolaires souples classiques;
— méthode B, pour tous types de matériaux polymères alvéolaires souples, mais essentiellement pour les matériaux ayant une faible perméabilité à l’air.
Pour la méthode B, deux méthodes sont spécifiées dans le présent document:
— méthode B1: avec mesurage manuel;
— méthode B2: avec mesurage automatique.
NOTE 1 Les indices d’écoulement d’air peuvent être utilisés pour donner une indication des effets de la variation des paramètres de formulation et de fabrication sur la structure cellulaire.
NOTE 2 Dans le présent document, le terme «matériaux polymères alvéolaires souples classiques» désigne les types qui ne conviennent pas pour l’étanchéité.
Polimerni materiali - Penjeni polimeri - Mehke pene - Določanje vrednosti zračnega pretoka pri konstantni razliki tlakov (ISO 7231:2023)
Ta dokument določa dve metodi za določanje vrednosti zračnega pretoka pri mehkih penjenih polimernih materialih:
– metoda A za konvencionalne vrste mehkih penjenih polimernih materialov;
– metoda B za vse vrste mehkih penjenih polimernih materialov, a še posebej za materiale z nizko prepustnostjo zraka.
Za metodo B sta v tem dokumentu določeni dve metodi:
– metoda B1: z ročnim merjenjem;
– metoda B2: s samodejnim merjenjem.
OPOMBA 1: Vrednosti zračnega pretoka se lahko uporabijo za navedbo učinkov spremenljivk formulacije in proizvodnje na penjeno strukturo.
OPOMBA 2: V tem dokumentu izraz »konvencionalna vrsta mehkega penjenega polimernega materiala« pomeni vrste, ki niso primerne za namene tesnjenja.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2023
Polimerni materiali - Penjeni polimeri - Mehke pene - Določanje vrednosti zračnega
pretoka pri konstantni razliki tlakov (ISO 7231:2023)
Polymeric materials, cellular, flexible - Determination of air flow value at constant
pressure-drop (ISO 7231:2023)
Weich-elastische Polymerschaumstoffe - Bestimmung der Luftdurchlässigkeit bei
konstantem Differenzdruck (ISO 7231:2023)
Matériaux polymères alvéolaires souples - Détermination de l'indice d'écoulement d'air à
chute de pression constante (ISO 7231:2023)
Ta slovenski standard je istoveten z: EN ISO 7231:2023
ICS:
83.100 Penjeni polimeri Cellular materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 7231
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2023
EUROPÄISCHE NORM
ICS 83.100 Supersedes EN ISO 7231:2010
English Version
Polymeric materials, cellular, flexible - Determination of
air flow value at constant pressure-drop (ISO 7231:2023)
Matériaux polymères alvéolaires souples - Weich-elastische Polymerschaumstoffe - Bestimmung
Détermination de l'indice d'écoulement d'air à chute de der Luftdurchlässigkeit bei konstantem Differenzdruck
pression constante (ISO 7231:2023) (ISO 7231:2023)
This European Standard was approved by CEN on 6 August 2023.
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, Türkiye 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7231:2023 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 7231:2023) has been prepared by Technical Committee ISO/TC 45 "Rubber and
rubber products" in collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of
which is held by SIS.
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 February 2024, and conflicting national standards
shall be withdrawn at the latest by February 2024.
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 7231:2010.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 7231:2023 has been approved by CEN as EN ISO 7231:2023 without any modification.
INTERNATIONAL ISO
STANDARD 7231
Third edition
2023-08
Polymeric materials, cellular,
flexible — Determination of air flow
value at constant pressure-drop
Matériaux polymères alvéolaires souples — Détermination de l'indice
d'écoulement d'air à chute de pression constante
Reference number
ISO 7231:2023(E)
ISO 7231:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii
ISO 7231:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Method A . 2
5.1 Apparatus . 2
5.2 Test pieces . 4
5.3 Test conditions . 4
5.4 Procedure . 5
5.5 Test report . 5
6 Method B . 6
6.1 Method B1 with manual measurement . 6
6.1.1 Apparatus . 6
6.1.2 Test pieces . 8
6.1.3 Test conditions . 8
6.1.4 Procedure . 8
6.1.5 Precision . 8
6.1.6 Test report . 8
6.2 Method B2 with automatic measurement . 9
6.2.1 Apparatus . 9
6.2.2 Test pieces . 10
6.2.3 Test conditions . 10
6.2.4 Procedure . 11
6.2.5 Test report . 11
Annex A (informative) Precision of methods B1 and B2 .12
Bibliography .14
iii
ISO 7231:2023(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
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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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
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expressions related to conformity assessment, as well as information about ISO's adherence to
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC45, Rubber and rubber products,
Subcommittee SC 4, Products (other than hoses), in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/TC 249, Plastics, in accordance with the Agreement
on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 7231:2010), which has been technically
revised.
The main changes are as follows:
— the previous Annex A has been moved to Clause 6 as method B2;
— the previous 6.5 (the precision of method B1) has been moved to a new Annex A.
— the previous precision of method B2 has been added to a new Annex A.
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.
iv
© IS
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