EN ISO 4638:1995

Polymeric materials, cellular flexible - Determination of air flow permeability (ISO 4638:1984)

Applicable to test pieces cut from products of cellular materials. Useful for two purposes: a) studying the structure of cellular products in connection with their physical properties and their method of manufacture and b) ensuring product quality (quality assurance). Describes principle, apparatus, test piece and conditions, procedure and calculation and expression of the results. Three figures deliver the details for testing.

Weichelastische Schaumstoffe - Bestimmung der Luftstromdurchlässigkeit (ISO 4638:1984)

Die vorliegende Internationale Norm beschreibt ein Verfahren zur Bestimmung der Luftstrom-Durchlässigkeit weichelastischer Schaumstoffe. Diese Norm gilt für aus Schaumstoff ausgeschnittene Probekörper.

Matériaux polymères alvéolaires souples - Détermination de la perméabilité à l'air (ISO 4638:1984)

La présente Norme internationale spécifie une méthode de détermination de la perméabilité à l'air des matériaux alvéolaires souples à base de polymères. Elle est applicable à des éprouvettes découpées dans des produits en matériau alvéolaire.  
NOTE -- L'ISO 7231, Matériaux polymères alvéolaires souples -- Détermination de l'indice d'écoulement d'air -- Méthode à chute de pression constante, 1) qui spécifiera une méthode simple de contrôle de fabrication, est également basée sur l'écoulement d'air à travers les matériaux alvéolaires. Elle peut être utilisée lorsqu'il ne s'agit pas d'évaluer les propriétés intrinsèques de matériaux différents de façon à pouvoir les comparer les uns aux autres, mais simplement de vérifier la constance de qualité d'un matériau alvéolaire donné.

Polimerni materiali - Mehke pene – Določevanje prepustnosti toka zraka (ISO 4638:1984)

General Information

• Status: Published
• Publication Date: 14-May-1995
• Withdrawal Date: 29-Nov-1995
• ICS: 83.100 - Cellular materials
• Technical Committee: CEN/TC 249 - Plastics
• Drafting Committee: CEN/TC 249/SC 4 - Cellular plastics
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 15-May-1995
• Completion Date: 15-May-1995
• Ref Project: SIST EN ISO 4638:1999 - Polymeric materials, cellular flexible - Determination of air flow permeability (ISO 4638:1984)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 4638:1999
01-maj-1999
3ROLPHUQLPDWHULDOL0HKNHSHQH±'RORþHYDQMHSUHSXVWQRVWLWRND]UDND,62

Polymeric materials, cellular flexible - Determination of air flow permeability (ISO
4638:1984)
Weichelastische Schaumstoffe - Bestimmung der Luftstromdurchlässigkeit (ISO
4638:1984)
Matériaux polymeres alvéolaires souples - Détermination de la perméabilité a l'air (ISO
4638:1984)
Ta slovenski standard je istoveten z: EN ISO 4638:1995
ICS:
83.100 Penjeni polimeri Cellular materials
SIST EN ISO 4638:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 4638:1999

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SIST EN ISO 4638:1999

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SIST EN ISO 4638:1999

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SIST EN ISO 4638:1999

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SIST EN ISO 4638:1999

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SIST EN ISO 4638:1999
International Standard
i
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.ME)I(flYHAPO~HAfl OPTAHM3ALWlFl l-IO CTAH~APTM3A~MM.ORGANlSATiON INTERNATIONALE DE NORMALISATION
Polymeric materials, cellular flexible - Determination
of air flow permeability
Mathriaux polym&es alvholaires soup/es - Dbtermina tion de la perm6abilit6 9 /‘air
First edition - 1984-05-15
UDC 678.4-405.8 : 620.193.29 Ref. No. IS0 4638-1984 (E)
cellular materials, flexible cellular materials, tests, determination, permeability, air flow.
Descriptors :
Price based on 7 pages

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SIST EN ISO 4638:1999
Foreword
lS0 (the International Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of developing International
Standards is carried out through IS0 technical committees. Every member body
interested in a subject for which a technical committee has been authorized 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.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council.
lnternationai Standard IS0 4638 was developed by Technical Committee ISO/TC 45,
Rubber and rubber products, and was circulated to the member bodies in
February 1982.
It has been approved by the member bodies of the following countries:
Austria Romania
Germany, F. R.
Belgium India South Africa, Rep. of
Brazil
Indonesia Spain
Canada Ireland Sri Lanka
China Mexico Thailand
Czechoslovakia Netherlands Turkey
Denmark Nigeria USA
Egypt, Arab Rep. of Poland USSR
France Portugal
on
The member body of the following country expressed disapproval of the document
technical grounds:
United Kingdom
0 International Organization for Standardization, 1984
Printed in Switzerland

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SIST EN ISO 4638:1999
IS0 4638-1984 (E)
INTERNATIONAL STANDARD
Polymeric materials, cellular flexible - Determination
of air flow permeability
3 Principle
0 Introduction
Passing air under controlled conditions through a test piece in
The air flow permeability of cellular materials indicates, in an
the form of a cylinder or parallelepiped. Measurement of the
indirect manner, some of their structural properties. It may be
pressure drop between the two free faces of the test piece.
used to establish correlations between the structure of these
materials and some of their physical properties. It also enables
identification of the modifications to cellular structures pro-
duced by chemical agents used in foaming, for example
4 Symbols and terminology
catalysts or surfactants.
4.1 Air flow permeability, K, is given by Darcy’s law (see
This International Standard is, therefore, useful for two pur-
figure 11, which describes the air flow in a homogeneous and
poses :
isotropic (see note 1) porous medium under laminar flow condi-
a) in studying the structure of cellular products in connec-
tions (see note 2) by the equation
tion with their physical properties and their method of
manufacture ;
qv K AP
=-=-
U
b) in ensuring product quality (quality assurance).
A
0
where
NOTE - Details of publications relating to flow behaviour in both
laminar and turbulent conditions are given in a bibliography.
u is the linear air flow velocity, in metres per second;
qv is the volumetric air flow rate, in cubic metres per
second, crossing the test piece;
1 Scope and field of application
A is the right cross-sectional area, in square metres, of the
This International Standard specifies a method for the deter-
test piece; _
m
...