SIST EN ISO 844:2021
(Main)Rigid cellular plastics - Determination of compression properties (ISO 844:2021)
Rigid cellular plastics - Determination of compression properties (ISO 844:2021)
This document specifies methods for determining the compressive strength and corresponding relative deformation, the compressive stress at 10 % relative deformation, and the compressive modulus of rigid cellular plastics.
Harte Schaumstoffe - Bestimmung der Druckeigenschaften (ISO 844:2021)
Dieses Dokument legt Verfahren zur Bestimmung der Druckfestigkeit und der zugehörigen Stauchung, der Druckspannung bei 10 % relativer Stauchung und des Druckmoduls für harte Schaumstoffe fest.
Plastiques alvéolaires rigides - Détermination des caractéristiques de compression (ISO 844:2021)
Le présent document spécifie des méthodes permettant de déterminer la résistance à la compression et la déformation relative correspondante, la contrainte en compression correspondant à 10 % de déformation relative et le module en compression des plastiques alvéolaires rigides.
Penjeni polimerni materiali - Trde pene - Ugotavljanje lastnosti stiskanja (ISO 844:2021)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2021
Nadomešča:
SIST EN ISO 844:2014
Penjeni polimerni materiali - Trde pene - Ugotavljanje lastnosti stiskanja (ISO
844:2021)
Rigid cellular plastics - Determination of compression properties (ISO 844:2021)
Harte Schaumstoffe - Bestimmung der Druckeigenschaften (ISO 844:2021)
Plastiques alvéolaires rigides - Détermination des caractéristiques de compression (ISO
844:2021)
Ta slovenski standard je istoveten z: EN ISO 844:2021
ICS:
83.100 Penjeni polimeri Cellular materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 844
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2021
EUROPÄISCHE NORM
ICS 83.100 Supersedes EN ISO 844:2014
English Version
Rigid cellular plastics - Determination of compression
properties (ISO 844:2021)
Plastiques alvéolaires rigides - Détermination des Harte Schaumstoffe - Bestimmung der
caractéristiques de compression (ISO 844:2021) Druckeigenschaften (ISO 844:2021)
This European Standard was approved by CEN on 31 January 2021.
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.
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COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 844:2021 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 844:2021) has been prepared by Technical Committee ISO/TC 61 "Plastics" in
collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN.
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 October 2021, and conflicting national standards shall
be withdrawn at the latest by October 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.
This document supersedes EN ISO 844:2014.
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 844:2021 has been approved by CEN as EN ISO 844:2021 without any modification.
INTERNATIONAL ISO
STANDARD 844
Seventh edition
2021-03
Rigid cellular plastics —
Determination of compression
properties
Plastiques alvéolaires rigides — Détermination des caractéristiques
de compression
Reference number
ISO 844:2021(E)
©
ISO 2021
ISO 844:2021(E)
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2021 – All rights reserved
ISO 844:2021(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Principle . 3
6 Apparatus . 3
6.1 Compression-testing machine . 3
6.2 Devices for measuring displacement and force . 3
6.2.1 Measurement of displacement . 3
6.2.2 Measurement of force . 4
6.2.3 Calibration . 4
6.3 Instruments for measuring the dimensions of the test specimens . 4
7 Test specimens. 4
7.1 Dimensions . 4
7.2 Preparation . 5
7.3 Number . 5
7.4 Conditioning . 5
8 Procedure. 5
9 Expression of results . 6
9.1 General . 6
9.2 Compressive strength and corresponding relative deformation . 7
9.2.1 Compressive strength . 7
9.2.2 Nominal relative deformation (procedure A) . 7
9.2.3 Relative deformation (procedure B) . 8
9.3 Compressive stress at 10 % nominal relative deformation (procedure A) . 8
9.4 Nominal compressive modulus of elasticity (procedure A) . 8
9.5 Compressive modulus of elasticity (procedure B) . 9
10 Precision . 9
10.1 Procedure A . 9
10.2 Procedure B .10
11 Test report .11
Annex A (informative) Remarks about the determination of the compressive modulus .12
Bibliography .15
ISO 844:2021(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.
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 documents 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).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10, Cellular
plastics, 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 seventh edition cancels and replaces the sixth edition (ISO 844:2014), which has been technically
revised. The main changes compared to the previous edition are as follows:
— different extensometer gage lengths have been given for use with different specimen thicknesses;
— repeatability and reproducibility results from the interlaboratory test on Procedure B have been
added for compressive strength and compressive modulus of elasticity measurements;
— Annex A has been added to provide information on the determination of the compressive modulus
by means Procedure B.
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 © ISO 2021 – All rights reserved
INTERNATIONAL STANDARD ISO 844:2021(E)
Rigid cellular plastics — Determination of compression
properties
1 Scope
This document specifies methods for determining the compressive strength and corresponding relative
deformation, the compressive stress at 10 % relative deformation, and the compressive modulus of
rigid cellular plastics.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 1923, Cellular plastics and rubbers — Determination of linear dimensions
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification of the force-measuring system
ISO 9513, Metallic materials — Calibration of extensometer systems used in uniaxial testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
nominal relative deformation (procedure A)
ε
C
ratio of the reduction (in relation to its initial value) in thickness of the test specimen
Note 1 to entry: It is expressed as a percentage.
Note 2 to entry: ε is the nominal relative deformation corresponding to σ (see 3.3).
Cm m
3.2
relative deformation (procedure B)
ε
ratio of the reduction (in relation to its initial value) of extensometer gauge length
Note 1 to entry: It is expressed as a percentage.
Note 2 to entry: ε is the relative deformation corresponding to σ (see 3.3).
m m
ISO 844:2021(E)
3.3
compressive strength
σ
m
maximum compressive force F divided by the initial cross-sectional area A of the test specimen when
m 0
the relative deformation ε and the nominal relative deformation ε respectively is < 10 %
C
Note 1 to entry: It is expressed in megapascals (MPa).
3.4
compressive stress at 10 % nominal relative deformation (procedure A)
σ
C10
ratio of the compressive force F at 10 % nominal relative deformation ε to the initial cross-sectional
10 C10
area of the test specimen
Note 1 to entry: It is expressed in megapascals (MPa).
3.5
nominal compressive modulus of elasticity (procedure A)
E
C
difference in compressive stress divided by the difference in corresponding nominal relative
deformation below the proportional limit, i.e. when the relation is linear
Note 1 to entry: It is expressed in megapascals (MPa).
3.6
compressive modulus of elasticity (procedure B)
E
difference in compressive stress divided by the corresponding difference in relative deformation below
the proportional limit, i.e. when the relation is linear
Note 1 to entry: It is expressed in megapascals (MPa).
3.7
conventional proportional limit
X
e
upper limit of the linear part of the force - deformation curve
Note 1 to entry: It is expressed in millimetres (mm).
4 Symbols
Symbol Definition Unit
A initial cross-sectional area in square milli-
metres
E compressive modulus of elasticity in megapascals
E nominal compressive modulus of elasticity in megapascals
C
F force corresponding to x (conventional proportional limit) in newtons
e e
F force corresponding to x (nominal proportional limit) in newtons
Ce Ce
F maximum force in newtons
m
F force at 10 % nominal relative deformation in newtons
h initial thickness of test specimen (Procedure A) in millimetres
l initial gauge length of the extensometer (Procedure B) in millimetres
o
Ra surface roughness
t thickness
X displacement at F in the conventional elastic zone, (Procedure B) in millimetres
e e
X nominal displacement at F in the conventional ela
...
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