EN ISO 4918:2021

SLOVENSKI STANDARD
01-maj-2021
Nadomešča:
SIST EN 425:2002
Netekstilne, tekstilne in laminatne talne obloge - Preskus s stolom na kolescih
(ISO 4918:2016)
Resilient,textile and laminate floor coverings - Castor chair test (ISO 4918:2016)
Elastische, textile und Laminat-Bodenbeläge - Stuhlrollenversuch (ISO 4918:2016)
Revêtements de sol textiles, résilients ou stratifiés - Essai à l'appareil à roulettes (ISO
4918:2016)
Ta slovenski standard je istoveten z: EN ISO 4918:2021
ICS:
97.150 Talne obloge Floor coverings
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 4918
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2021
EUROPÄISCHE NORM
ICS 97.150 Supersedes EN 425:2002
English Version
Resilient,textile and laminate floor coverings - Castor chair
test (ISO 4918:2016)
Revêtements de sol textiles, résilients ou stratifiés - Elastische, textile und Laminat-Bodenbeläge -
Essai à l'appareil à roulettes (ISO 4918:2016) Stuhlrollenversuch (ISO 4918:2016)
This European Standard was approved by CEN on 19 March 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
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 4918:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 4918:2016 has been prepared by Technical Committee ISO/TC 219 "Floor coverings” of
the International Organization for Standardization (ISO) and has been taken over as EN ISO 4918:2021
by Technical Committee CEN/TC 134 “Resilient, textile and laminate floor coverings” 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 September 2021, and conflicting national standards
shall be withdrawn at the latest by September 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 425:2002.
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 4918:2016 has been approved by CEN as EN ISO 4918:2021 without any modification.

INTERNATIONAL ISO
STANDARD 4918
Second edition
2016-03-15
Resilient, textile and laminate floor
coverings — Castor chair test
Revêtements de sol textiles, résilients ou stratifiés — Essai à l’appareil
à roulettes
Reference number
ISO 4918:2016(E)
©
ISO 2016
ISO 4918:2016(E)
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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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Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved

ISO 4918:2016(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
6 Materials . 5
7 Sampling . 5
7.1 Textile floor coverings . 5
7.2 Resilient floor covering . 6
7.3 Laminate floor coverings . 6
8 Conditioning . 7
8.1 Textile floor coverings . 7
8.2 Resilient and laminate floor coverings . 7
9 Procedure. 7
9.1 Textile floor coverings . 7
9.1.1 General. 7
9.1.2 Mounting of the specimens . 7
9.1.3 Verifications of the castors . 7
9.1.4 Preparing of the apparatus . 8
9.1.5 Test procedures for textile floor coverings . 8
9.2 Resilient and laminate floor coverings . 9
9.2.1 General. 9
9.2.2 Mounting of the specimen . 9
9.2.3 Verification of the castors .10
9.2.4 Preparing the apparatus .10
9.2.5 Test procedure for resilient and laminate floor coverings .10
10 Assessment .10
10.1 Textile floor coverings .10
10.1.1 General.10
10.1.2 Test A — Structural integrity assessment .11
10.1.3 Test A — Appearance retention assessment .11
10.1.4 Test B — Colour change assessment .11
10.1.5 Test C — Structural integrity assessment .11
10.2 Resilient floor coverings .11
10.2.1 Resilient floor covering with click joints for floating installation .11
10.3 Laminate floor coverings .11
11 Calculations and expression of results .12
11.1 Textile floor coverings .12
11.1.1 Optional results for textile floor coverings .12
11.2 Resilient floor coverings .12
11.3 Laminate floor coverings .12
12 Test report .12
ISO 4918:2016(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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 219, Floor coverings.
This second edition cancels and replaces the first edition (ISO 4918:2009), which has been technically
revised.
iv © ISO 2016 – All rights reserved

INTERNATIONAL STANDARD ISO 4918:2016(E)
Resilient, textile and laminate floor coverings — Castor
chair test
1 Scope
This International Standard specifies methods for determining the change of appearance and stability
of a textile floor covering or any damage caused by detachment of layers, opening of joints, or crazing of
a resilient or laminate floor covering under the movement of a castor chair.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 139, Textiles — Standard atmospheres for conditioning and testing
ISO 1957, Machine-made textile floor coverings — Selection and cutting of specimens for physical tests
ISO 2424, Textile floor coverings — Vocabulary
ISO 9405, Textile floor coverings — Assessment of changes in appearance
CEN/TS 16354, Laminate floor coverings — Underlays — Specification, requirements and test methods
EN 12466, Resilient floor coverings — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 2424 and EN 12466 apply.
4 Principle
A floor covering, including one or more joints, treated or welded where necessary, is submitted for a
prescribed number of cycles to the action of three castors. The castors move in epicyclical paths with
multiple changes of direction, stops and starts, and the frequency of passage varies from area to area.
For textile floor coverings, three different assessment methods are specified:
a) the change in appearance of a textile floor covering is assessed after 5 000 cycles and 25 000 cycles,
in accordance with ISO 9405 (Test A),
b) the change in colour is assessed by means of grey scales after 750 cycles (Test B),
c) the extent of deterioration of the specimen is assessed after 10 000 cycles or 25 000 cycles (Test C).
For resilient and laminate floor coverings, any damage caused by detachment of layers, opening of
joints, or crazing of the specimen is assessed.
ISO 4918:2016(E)
5 Apparatus
Dimensions in millimetres
Key
1 total mass 90 kg 6 specimen
2 distance >3 mm 7 suction device with height regulation
3 load/drive plate 8 test platform
4 castor mounting plate 9 specimen support
5 chain
Figure 1 — Typical castor chair apparatus
5.1 Rotating circular test platform.
The rotating circular test platform on which the specimen is placed shall have a diameter of
minimum 800 mm.
5.2 Castor assembly.
This assembly comprises a vertical shaft, set in a bearing, and a plate on which the castors are mounted
(Figure 2, item 1). This castor assembly is offset at a distance of (198 ± 1) mm from the centre of the
rotating test platform.
The three castors are each arranged concentrically at 120° intervals around the centre of the plate at
a distance of (130 ± 1) mm from the centre of the plate, and are free to rotate, so that they follow the
rotation of the castor assembly.
The tested area of the specimen is determined by the distance between the axes of revolution of the
castor chair assembly and the specimen table and by the distance of the castors from the centre of the
plate. This area is approximately 0,3 m .
The apparatus is provided with a lifting device to raise the castor assembly above the testing platform
when the apparatus is stopped.
2 © ISO 2016 – All rights reserved

ISO 4918:2016(E)
The castor assembly is loaded with a mass of (90 ± 1) kg equally divided over the three castors.
The distance (under load) between the castor mounting plate and the load/drive plate shall be >3 mm.
Key
1 castor assembly
Figure 2 — Path of castors
5.3 Drive mechanism.
The drive to the specimen plate and to the castor assembly is interlocked and fitted with a reversing
mechanism. The number of cycles is set by means of a pre-set counter. The rotational speed of the
rotating platform shall be (19 ± 2) r/min and that of the castor assembly (50 ± 5) r/min.
After (180 ± 10) s of rotation, the platform shall stop and remain in the stop position for (5 ± 2) s, after
which time the direction of rotation of the rotating platform shall reverse.
The relationship between the rotational speed of the specimen plate and that of the castor assembly
causes a sharp reverse movement of the castors within the stressed area (see Figure 2).
5.4 Suction device.
A suction device (Figure 1, item 7) is mounted over the entire width of the stressed area, the height of
this device above the specimen being adjustable. The suction capacity shall be at least 25 l/s to 30 l/s.
5.5 Castors.
5.5.1 General
Single-wheel swivel castors shall be used having the following dimensions (see Figure 3):
a) diameter: (50 ± 2) mm;
b) width: (20 ± 2) mm;
c) radius of curvature, R, of castor tread: (130 ± 5) mm;
d) crank distance: (32 ± 2) mm.
The distance between any two castor mountings shall be (225 ± 5) mm.
ISO 4918:2016(E)
Figure 3 — Single-wheel swivel castors (nominal dimensions in mm)
5.5.2 Type H castors, suitable for textile, resilient, and laminate floor coverings.
Type H, polyamide castors have plain wheels and a hard tread, shore hardness 90 ± 5. The wheels
shall be one colour over th
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