SIST ISO 844:2003
(Main)Rigid cellular plastics -- Determination of compression properties
Rigid cellular plastics -- Determination of compression properties
Plastiques alvéolaires rigides -- Détermination des caractéristiques de compression
Penjeni polimerni materiali - Trde pene – Določevanje lastnosti stiskanja
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INTERNATIONAL ISO
STANDARD 844
Third edition
2001-06-01
Rigid cellular plastics — Determination of
compression properties
Plastiques alvéolaires rigides — Détermination des caractéristiques de
compression
Reference number
ISO 844:2001(E)
ISO 2001
---------------------- Page: 1 ----------------------
ISO 844:2001(E)
PDF disclaimer
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file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this
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© ISO 2001All 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
Case postale 56 � CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.ch
Web www.iso.ch
Printed in Switzerland
ii © ISO 2001 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 844:2001(E)
Contents Page
Foreword.....................................................................................................................................................................iv
1 Scope ..............................................................................................................................................................1
2 Normative references ....................................................................................................................................1
3 Terms and definitions ...................................................................................................................................1
4 Symbols and abbreviated terms ..................................................................................................................2
5 Principle..........................................................................................................................................................2
6 Apparatus .......................................................................................................................................................3
7 Test specimens..............................................................................................................................................3
8 Procedure .......................................................................................................................................................4
9 Expression of results ....................................................................................................................................4
10 Precision.........................................................................................................................................................6
11 Test report ......................................................................................................................................................6
© ISO 2001 – All rights reserved iii---------------------- Page: 3 ----------------------
ISO 844:2001(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 3.
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 International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 844 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10,
Cellular plastics.This third edition cancels and replaces the second edition (ISO 844:1998), which has been the subject of a minor
revision to correct, in particular, the title, the units of E in clause 4 and the labelling of Figures 1 b) and 1 c).
iv © ISO 2001 – All rights reserved---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 844:2001(E)
Rigid cellular plastics — Determination of compression properties
1 Scope
This International Standard specifies a method of determining
a) the compressive strength and corresponding relative deformation
b) the compressive stress at 10 % relative deformation
and
c) when desired, the compressive modulus
of rigid cellular plastics.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.ISO 291:1997, Plastics — Standard atmospheres for conditioning and testing.
ISO 1923:1981, Cellular plastics and rubbers — Determination of linear dimensions.
3 Terms and definitionsFor the purposes of this International Standard, the following terms and definitions apply.
3.1relative deformation
ratio of the reduction (in relation to its initial value) in thickness of the test specimen to its initial thickness
NOTE 1 It isexpressedasa percentage.NOTE 2 � is the relative deformation corresponding to� (see 3.2).
m m
© ISO 2001 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 844:2001(E)
3.2
compressive strength
maximum compressive force F divided by the initial cross-sectional area of the test specimen when the relative
deformation � is � 10 %3.3
compressive stress at 10 % relative deformation
ratio of the compressive force F at 10 % relative deformation (� ) to the initial cross-sectional area of the test
10 10specimen
3.4
compressive modulus of elasticity
compressive stress divided by the corresponding relative deformation below the proportional limit, i.e. when the
relation is linear4 Symbols and abbreviated terms
A initial cross-sectional area, in square millimetres
E compressive modulus of elasticity, in kilopascals
F force corresponding to x (conventional proportional limit), in newtons
e e
F maximum force, in newtons
F force at 10 % relative deformation, in newtons
h initial thickness of test specimen, in millimetres
� relative deformation corresponding to compressive strength � , in percent
m m
� compressive strength, in kilopascals
� compressive stress at 10 % relative deformation, in kilopascals
x displacement at F in the conventional elastic zone, in millimetres
e e
x displacement at maximum force, in millimetres
x displacement at 10 % relative deformation, in millimetres
kPa kilopascals
Pa pascals
5Principle
A compressive force is applied in an axial direction to the faces of a rectangular parallelepiped test specimen. The
maximum stress supported by the test specimen is calculated.2 © ISO 2001 – All rights reserved
---------------------- Page: 6 ----------------------
ISO 844:2001(E)
If the value of the maximum stress corresponds to a relative deformation of less than 10 %, it is noted as the
“compressive strength”. Otherwise, the compressive stress at 10 % relative deformation is calculated and its value
noted as the “compressive stress at 10 % relative deformation”.6 Apparatus
6.1 Compression-testing machine
Any compression-testing machine suited to the range of force and displacement involved and having two square or
circular plane, parallel plates which are polished and cannot be deformed and of which the length of one s
...SLOVENSKI STANDARD
SIST ISO 844:2003
01-julij-2003
3HQMHQLSROLPHUQLPDWHULDOL7UGHSHQH±'RORþHYDQMHODVWQRVWLVWLVNDQMD
Rigid cellular plastics -- Determination of compression properties
Plastiques alvéolaires rigides -- Détermination des caractéristiques de compression
Ta slovenski standard je istoveten z: ISO 844:2001ICS:
83.100 Penjeni polimeri Cellular materials
SIST ISO 844:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------SIST ISO 844:2003
---------------------- Page: 2 ----------------------
SIST ISO 844:2003
INTERNATIONAL ISO
STANDARD 844
Third edition
2001-06-01
Rigid cellular plastics — Determination of
compression properties
Plastiques alvéolaires rigides — Détermination des caractéristiques de
compression
Reference number
ISO 844:2001(E)
ISO 2001
---------------------- Page: 3 ----------------------
SIST ISO 844:2003
ISO 844:2001(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not
be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this
file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this
area.Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters
were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event
that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO 2001All 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
Case postale 56 � CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.ch
Web www.iso.ch
Printed in Switzerland
ii © ISO 2001 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 844:2003
ISO 844:2001(E)
Contents Page
Foreword.....................................................................................................................................................................iv
1 Scope ..............................................................................................................................................................1
2 Normative references ....................................................................................................................................1
3 Terms and definitions ...................................................................................................................................1
4 Symbols and abbreviated terms ..................................................................................................................2
5 Principle..........................................................................................................................................................2
6 Apparatus .......................................................................................................................................................3
7 Test specimens..............................................................................................................................................3
8 Procedure .......................................................................................................................................................4
9 Expression of results ....................................................................................................................................4
10 Precision.........................................................................................................................................................6
11 Test report ......................................................................................................................................................6
© ISO 2001 – All rights reserved iii---------------------- Page: 5 ----------------------
SIST ISO 844:2003
ISO 844:2001(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 3.
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 International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 844 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10,
Cellular plastics.This third edition cancels and replaces the second edition (ISO 844:1998), which has been the subject of a minor
revision to correct, in particular, the title, the units of E in clause 4 and the labelling of Figures 1 b) and 1 c).
iv © ISO 2001 – All rights reserved---------------------- Page: 6 ----------------------
SIST ISO 844:2003
INTERNATIONAL STANDARD ISO 844:2001(E)
Rigid cellular plastics — Determination of compression properties
1 Scope
This International Standard specifies a method of determining
a) the compressive strength and corresponding relative deformation
b) the compressive stress at 10 % relative deformation
and
c) when desired, the compressive modulus
of rigid cellular plastics.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.ISO 291:1997, Plastics — Standard atmospheres for conditioning and testing.
ISO 1923:1981, Cellular plastics and rubbers — Determination of linear dimensions.
3 Terms and definitionsFor the purposes of this International Standard, the following terms and definitions apply.
3.1relative deformation
ratio of the reduction (in relation to its initial value) in thickness of the test specimen to its initial thickness
NOTE 1 It isexpressedasa percentage.NOTE 2 � is the relative deformation corresponding to� (see 3.2).
m m
© ISO 2001 – All rights reserved 1
---------------------- Page: 7 ----------------------
SIST ISO 844:2003
ISO 844:2001(E)
3.2
compressive strength
maximum compressive force F divided by the initial cross-sectional area of the test specimen when the relative
deformation � is � 10 %3.3
compressive stress at 10 % relative deformation
ratio of the compressive force F at 10 % relative deformation (� ) to the initial cross-sectional area of the test
10 10specimen
3.4
compressive modulus of elasticity
compressive stress divided by the corresponding relative deformation below the proportional limit, i.e. when the
relation is linear4 Symbols and abbreviated terms
A initial cross-sectional area, in square millimetres
E compressive modulus of elasticity, in kilopascals
F force corresponding to x (conventional proportional limit), in newtons
e e
F maximum force, in newtons
F force at 10 % relative deformation, in newtons
h initial thickness of test specimen, in millimetres
� relative deformation corresponding to compressive strength � , in percent
m m
� compressive strength, in kilopascals
� compressive stress at 10 % relative deformation, in kilopascals
x displacement at F in the conventional elastic zone, in millimetres
e e
x displacement at maximum force, in millimetres
x displacement at 10 % relative deformation, in millimetres
kPa kilopascals
Pa pascals
5Principle
A compressive force is applied in an axial direction to the faces of a rectangular parallelepiped test specimen. The
maximum stress supported by the test specimen is calculated.2 © ISO 2001 – All rights reserved
---------------------- Page: 8 ----------------------
SIST ISO 844:2003
ISO 844:2001(E)
If the value of the maximum stress corresponds to a relative deformation of less than 10 %, it is noted as the
“compressive strength”...
NORME ISO
INTERNATIONALE 844
Troisième édition
2001-06-01
Plastiques alvéolaires rigides —
Détermination des caractéristiques de
compression
Rigid cellular plastics — Determination of compression properties
Numéro de référence
ISO 844:2001(F)
ISO 2001
---------------------- Page: 1 ----------------------
ISO 844:2001(F)
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Case postale 56 � CH-1211 Geneva 20
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Fax. + 41 22 749 09 47
E-mail copyright@iso.ch
Web www.iso.ch
Imprimé en Suisse
ii © ISO 2001 – Tous droits réservés
---------------------- Page: 2 ----------------------
ISO 844:2001(F)
Sommaire Page
Avant-propos..............................................................................................................................................................iv
1 Domaine d'application...................................................................................................................................1
2Références normatives .................................................................................................................................1
3Termesetdéfinitions.....................................................................................................................................1
4 Symboles et abréviations .............................................................................................................................2
5 Principe...........................................................................................................................................................2
6 Appareillage ...................................................................................................................................................3
7 Éprouvettes ....................................................................................................................................................3
8 Mode opératoire.............................................................................................................................................4
9 Expression des résultats ..............................................................................................................................5
10 Fidélité ............................................................................................................................................................6
11 Rapport d'essai ..............................................................................................................................................7
© ISO 2001 – Tous droits réservés iii---------------------- Page: 3 ----------------------
ISO 844:2001(F)
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux de
normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général confiéeaux
comités techniques de l'ISO. Chaque comité membre intéressé par une étude aledroit de fairepartie ducomité
technique créé à cet effet. Les organisations internationales, gouvernementales et non gouvernementales, en
liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec la Commission
électrotechnique internationale (CEI) en ce qui concerne la normalisation électrotechnique.
Les Normes internationales sont rédigées conformément aux règles données dans les Directives ISO/CEI, Partie 3.
Les projets de Normes internationales adoptés par les comités techniques sont soumis aux comités membres pour
vote. Leur publication comme Normes internationales requiert l'approbation de 75 % au moins des comités
membres votants.L’attention est appelée sur le fait que certains des éléments delaprésente Norme internationale peuvent faire
l’objet de droits de propriété intellectuelle ou de droits analogues. L’ISO ne saurait être tenue pour responsable de
ne pas avoir identifié de tels droits de propriété et averti de leur existence.La Norme internationale ISO 844 a étéélaborée par le comité technique ISO/TC 61, Plastiques, sous-comité
SC 10, Plastiques alvéolaires.Cette troisième édition annule et remplace la deuxième édition (ISO 844:1998), qui a fait l’objet d’une révision
mineure pour corriger, en particulier, le titre, les unitésde E dans l’article 4 et l’étiquetage des Figures 1 b) et 1 c).
iv © ISO 2001 – Tous droits réservés---------------------- Page: 4 ----------------------
NORME INTERNATIONALE ISO 844:2001(F)
Plastiques alvéolaires rigides — Détermination des
caractéristiques de compression
1 Domaine d'application
La présente Norme internationale spécifie une méthode pour la détermination
a) de la résistance à la compression et de la déformation relative correspondante
b) de la contrainte en compression à 10 % de déformation relativec) lorsque cela est souhaitable, du module de compression des matériaux alvéolaires rigides.
2Références normativesLes normes suivantes contiennent des dispositions qui, par suite de la référence qui en est faite, constituent des
dispositions valables pour la présente Norme internationale. Au moment de la publication, les éditions indiquées
étaient en vigueur. Toute norme est sujette à révision et les parties prenantes des accords fondés sur la présente
Norme internationale sont invitées à rechercher la possibilité d'appliquer les éditions les plus récentes des normes
indiquées ci-après. Les membres de la CEI et de l'ISO possèdent le registre des Normes internationales en vigueur
à un moment donné.ISO 291:1997, Plastiques — Atmosphères normales de conditionnement et d'essai.
ISO 1923:1981, Plastiques et caoutchoucs alvéolaires — Détermination des dimensions linéaires.
3 Termes et définitionsPour les besoins de la présente Norme internationale, les termes et définitions suivants s'appliquent.
3.1déformation relative
rapport de la diminution d'épaisseur (par rapport à sa valeur initiale) de l'éprouvette à son épaisseur initiale
NOTE 1 Elle est exprimée en pourcentage.NOTE 2 La déformation relative correspondant à � (voir3.2)est désignée par � .
m m
© ISO 2001 – Tous droits réservés 1
---------------------- Page: 5 ----------------------
ISO 844:2001(F)
3.2
résistance à la compression
rapport de la force maximale de compression F atteinte lorsque la déformation relative � est inférieure à 10 %, à
l'aire initiale de la section transversale de l'éprouvette3.3
contrainte en compression à 10 % de déformation relative
rapport de la force de compression F à 10 % de déformation relative � , à l'aire initiale de la section transversale
10 10de l'éprouvette
3.4
module d'élasticité en compression
rapport de la contrainte en compression à la déformation relative correspondante en deçà de la limite
proportionnelle, c'est-à-dire quand la relation est linéaire4 Symboles et abréviations
A aire initiale de la section transversale, en millimètres carrés, de l'éprouvette
E module d'élasticité en compression, en kilopascalsF force, en newtons, correspondant à x (limite proportionnelle conventionnelle)
F force maximale, en newtons
F force, en newtons, correspondant à 10 % de déformation relative
h épaisseur initiale, en millimètres, de l'éprouvette
� déformation relative, en pourcentage, correspondant à la résistance à la compression �
m m� résistance à la compression, en kilopascals
� contrainte en compression, en kilopascals, à 10 % de déformation relative
x déplacement, en millimètres, correspondant à F dans la zone conventionnelle d'élasticité
e ex déplacement, en millimètres, correspondant à la force maximale
x déplacement, en millimètres, correspondant à 10 % de déformation relative
kPa kilopascal
Pa pascal
5Principe
Une force de compression est appliquée en direction axiale sur les faces d'une éprouvette parallélépipédique
rectangle. La contrainte maximale supportée par l'éprouvette est calculée.2 © ISO 2001 – Tous droits réservés
---------------------- Page: 6 ----------------------
ISO 844:2001(F)
Si la valeur de la contrainte maximale correspond à une déformation relative inférieure à 10 %, elle est notée
comme étant la «résistance à la compression». Sinon, la contrainte en compression à 10 % de déformation relative
est calculée et sa valeur est notéecomme étant la «contrainte en compression à 10 % de déformation relative».
6 Appareillage6.1 Machine d'essai de compression
On peut utiliser toute machine d'essai de compression appropriée au domaine de force et de déplacement à mettre
en œuvre, munie de deux plateaux parallèles indéformables, de surface plane et polie, et de forme carréeou
circulaire, dont le côté(oulediamètre) est au moins éga...
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