EN ISO 16534:2020

SLOVENSKI STANDARD
01-oktober-2020
Toplotnoizolacijski proizvodi za uporabo v gradbeništvu - Ugotavljanje lezenja pod
tlačno obremenitvijo (ISO 16534:2020)
Thermal insulating products for building applications - Determination of compressive
creep (ISO 16534:2020)
Wärmedämmstoffe für das Bauwesen - Bestimmung des Langzeit-Kriechverhaltens bei
Druckbeanspruchung (ISO 16534:2020)
Produits isolants thermiques destinés aux applications du bâtiment - Détermination du
fluage en compression (ISO 16534:2020)
Ta slovenski standard je istoveten z: EN ISO 16534:2020
ICS:
91.100.60 Materiali za toplotno in Thermal and sound insulating
zvočno izolacijo materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 16534
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2020
EUROPÄISCHE NORM
ICS 91.100.60
English Version
Thermal insulating products for building applications -
Determination of compressive creep (ISO 16534:2020)
Produits isolants thermiques destinés aux applications Wärmedämmstoffe für das Bauwesen - Bestimmung
du bâtiment - Détermination du fluage en compression des Langzeit-Kriechverhaltens bei
(ISO 16534:2020) Druckbeanspruchung (ISO 16534:2020)
This European Standard was approved by CEN on 22 June 2020.

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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16534:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 16534:2020) has been prepared by Technical Committee ISO/TC 163 "Thermal
performance and energy use in the built environment" in collaboration with Technical Committee
CEN/TC 88 “Thermal insulating materials and products” 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 January 2021, and conflicting national standards shall
be withdrawn at the latest by January 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.
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 16534:2020 has been approved by CEN as EN ISO 16534:2020 without any modification.

INTERNATIONAL ISO
STANDARD 16534
Second edition
2020-06
Thermal insulating products
for building applications —
Determination of compressive creep
Produits isolants thermiques destinés aux applications du bâtiment —
Détermination du fluage en compression
Reference number
ISO 16534:2020(E)
©
ISO 2020
ISO 16534:2020(E)
© ISO 2020
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
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below or ISO’s member body in the country of the requester.
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Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 16534:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 3
5 Principle . 3
6 Apparatus . 3
7 Test specimens. 4
7.1 Selection of test specimens . 4
7.2 Dimensions of test specimens . 4
7.3 Number of test specimens . 5
7.4 Preparation of test specimens . 5
7.5 Conditioning of test specimens . 5
8 Procedure. 5
8.1 Test conditions . 5
8.2 Stress selection . 6
8.3 Test procedure . 6
8.4 Duration of test . 8
9 Calculation and expression of results . 8
10 Accuracy of measurement . 8
11 Test report . 8
Annex A (normative) Calculation method .10
Annex B (informative) Example of a linear regression analysis .13
Bibliography .16
ISO 16534:2020(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 Committee ISO/TC 163, Thermal performance and
energy use in the built environment, Subcommittee SC 1, Test and measurement methods, in collaboration
with the European Committee for Standardization (CEN) Technical Committee CEN/TC 88, Thermal
insulating materials and products, in accordance with the Agreement on technical cooperation between
ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 16546:2012), which has been technically
revised. The main changes compared to the previous edition are as follows:
— modification of Figure 1;
— editorial modifications.
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 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 16534:2020(E)
Thermal insulating products for building applications —
Determination of compressive creep
1 Scope
This document specifies the equipment and test method for determining the compressive creep of
specimens under various conditions of stress.
This document is applicable to thermal insulating products.
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 29469, Thermal insulating products for building applications — Determination of compression
behaviour
ISO 29768, Thermal insulating products for building applications — Determination of linear dimensions of
test specimens
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
thickness
linear dimension measured perpendicular to the planes of length and width
3.2
compressive stress
σ
c
ratio of the compressive force to the initial cross-sectional surface area of the test specimen
3.3
deformation
X
reduction in thickness (3.1) of the test specimen
3.4
relative deformation
ε
ratio of the deformation (3.3) of the test specimen X, and its thickness (3.1) d , measured in the direction
s
of loading
ISO 16534:2020(E)
3.5
compressive creep
X
ct
increase in deformation (3.3) of the test specimen over time whilst under a constant stress, at specified
conditions of temperature and humidity
X = X ‒ X
ct t 0
where
X is the deformation at time t;
t
X is the initial deformation (after 60 s from the beginning of loading).
Note 1 to entry: An illustration of the different thicknesses (3.1) and deformations is given in Figure 1.
Key
d original product thickness
d initial thickness of the test specimen
s
d thickness of the test specimen under the basic compressive stress of the loading device (‘dead weight’)
L
d thickness of the test specimen 60 s after the beginning of the loading process
X the initial deformation (after 60 s from the beginning of loading)
X increase in deformation of the test specimen over time whilst under a constant stress, at specified conditions
ct
of temperature and humidity
X total the deformation at selected time t
t 3
t time when dead wright is applied
t time when selected load is uniformly applied
t deformation at selected time
Y thickness
X time
In the illustration, d is used as a reference value for deformation measurements. If d is used as the reference
L s
value, the illustration can be used, omitting the column for d (see 8.3).
L
Figure 1 — Illustration of the different thicknesses and deformations
2 © ISO 2020 – All rights reserved

ISO 16534:2020(E)
4 Symbols
Symbol Description
d original product thickness
d thickness of the test specimen
S
d thickness of the test specimen under the basic compressive stress of the loading device ('dead
L
weight')
d thickness of the test specimen 60 s after the beginning of the loading process
d thickness of the test specimen at a given time, t
t
5 Principle
The compressive creep is determined by measuring the increase in deformation of a test specimen
under constant compressive stress and specified conditions of temperature, humidity and time.
6 Apparatus
6.1 Loading device, consisting of two flat plates, one of which shall be movable, arranged so that they
compress the test specimen in a vertical direction. The movable plate shall be guided in such a manner as
to be self-aligning. The plates shall be capable of being loaded smoothly and without distortion so that,
during the test, the static stress does not change by more than +5 %.
6.2 Measuring device (e.g. dial gauge), capable of determining the distance between the two plates,
i.e. the deformation of the test specimen, to an accuracy of 0,01 mm.
6.3 Suitable damping measures, to ensure the effects of external vibration are minimized (e.g. a
substantial foundation and anchoring of the apparatus support).
Examples of the testing apparatus are given in Figure 2.
ISO 16534:2020(E)
Example of device type 1 Example of device type 2
Key
1 displacement transducer or dial gauge 4 test specimen
2 loading bridge 5 support beam
3 load distribution plate (movable, self-aligning) 6 loading by weights
Figure 2 — Examples of test apparatus
7 Test specimens
7.1 Selection of test specimens
The test specimens for determining the compressive creep shall be taken from the same sample, with
the same preparation as the test specimens used for the compression test as specified in ISO 29469.
The method for selecting the test specimens shall be as specified in the relevant product standard.
NOTE In the absence of a product standard or any other technical specification, the method for selection of
the test specimens can be agreed between parties.
7.2 Dimensions of test specimens
The thickness of test specimens shall be equal to the original product thickness. The width of the test
specimens shall not be less than their thickness. Products with facings or integral moulded skins which
are intended to be retained in use shall be tested with these faces or skins intact.
4 © ISO 2020 – All rights reserved

ISO 16534:2020(E)
Test specimens shall not be layered to produce a greater thickness for testing.
The test specimens shall be cut squarely and have sides with the following recommended dimen
...