prEN ISO 4918

Resilient,textile and laminate floor coverings - Castor chair test (ISO 4918:2016)

ISO 4918:2016 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.

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)

Netekstilne, tekstilne in laminatne talne obloge - Preskus s stolom na kolescih (ISO 4918:2016)

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN ISO 4918:2020
01-november-2020
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: prEN ISO 4918
ICS:
97.150 Talne obloge Floor coverings
oSIST prEN ISO 4918:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 4918:2020
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oSIST prEN ISO 4918:2020
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
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oSIST prEN ISO 4918:2020
ISO 4918:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© 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

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ii © ISO 2016 – All rights reserved
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oSIST prEN ISO 4918:2020
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 2016 – All rights reserved iii
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oSIST prEN ISO 4918:2020
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.
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oSIST prEN ISO 4918:2020
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.
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oSIST prEN ISO 4918:2020
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.
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oSIST prEN ISO 4918:2020
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.
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oSIST prEN ISO 4918:2020
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 their entire surface. The castor treads are made from polyamide and shall be

replaced after maximum 2 000 000 cycles of the test platform.

The castor treads shall be examined after each test to verify that they are still smooth, without any

deep scoring or encrusted hard particles. The tread shall be replaced if the dimensions of the wheel fall

outside the tolerances given in 5.5.1.
5.5.3 Type W castors, suitable for resilient and laminate floor covering.

Type W, polyurethane covered castor wheels, shore hardness 85 ± 5. The surface of the castor wheels

shall be replaced after maximum 1 000 000 cycles of the test platform.

The castor treads shall be examined after each test to verify that they are still smooth, without any

deep scoring or encrusted hard particles. The tread shall be replaced if the dimensions of the wheel fall

outside the tolerances given in 5.5.1.

5.6 Lifting device, to raise the castor assembly above the testing platform when the apparatus is

stationary.
5.7 Cycle counter, for setting the number of cycles of the testing platform.
5.8 Fastening system.

Flooring samples shall be securely held in place using glue, tape, or other suitable means. For loose-laid

installations, panel shall be secured at the outer perimeter to prevent samples, which may include a

flooring product and an underlayment, from shifting during the test using tape, a hold down ring, or

other suitable means. Take care not to use mechanical horizontal fastening force.

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oSIST prEN ISO 4918:2020
ISO 4918:2016(E)
5.9 Specimen support.

The specimen shall be placed on a circular sheet of rigid plastic [e.g. poly(methyl methacrylate)] or

suitable substrate with a thickness of (7 ± 2) mm and a diameter of (800 ± 5) mm.

The support itself shall be laid on the test platform and holes made in the support in order to engage the

platform studs, to prevent slippage.
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