Bsi bs en 00434 1994 (1999)

www bzfxw com BRITISH STANDARD BS EN 434 1994 Resilient floor coverings — Determination of dimensional stability and curling after exposure to heat The European Standard EN 434 1994 has the status of[.]

Resilient floor

coverings —

Determination of

dimensional stability

and curling after

exposure to heat

The European Standard EN 434:1994 has the status of a

British Standard

UDC 698.7:692.535.6:645.13:620.1:536.413

BS EN 434:1994

This British Standard, having

been prepared under the

direction of the Plastics and

Rubber Standards Policy

Committee, was published

under the authority of the

Standards Board and comes

into effect on

15 November 1994

© BSI 07-1999

The following BSI references

relate to the work on this

standard:

Committee reference PRM/60

Draft for comment 91/35315 DC

ISBN 0 580 23121 6

Cooperating organizations

The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries:

Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standard

Finland Suomen Standardisoimisliito, r.y

France Association française de normalisation Germany Deutsches Institut für Normung e.V

Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland

Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portuguès da Qualidade Spain Asociación Española de Normalización y Certificación Sweden Standardiseringskommissionen i Sverige

Switzerland Association suisse de normalisation United Kingdom British Standards Institution

Amendments issued since publication

Amd No Date Comments

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Contents

Page

National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-reference Inside back cover

BS EN 434:1994

ii © BSI 07-1999

National foreword

This British Standard has been prepared under the direction of the Plastics and Rubber Standards Policy Committee and is the English language version of

EN 434:1994 Resilient floor coverings — Determination of dimensional stability

and curling after exposure to heat, published by the European Committee for

Standardization (CEN)

EN 434 was produced as a result of European discussions in which the United Kingdom took an active part

There is no existing British Standard equivalent to EN 434

A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application

Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 4, an inside back cover and a back cover

This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover

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EUROPÄISCHE NORM August 1994

UDC 698.7:692.535.6:645.13:620.1:536.413

Descriptors: Floor coverings, textile floor coverings, tests, determination, dimensional stability, thermal resistance

English version

Resilient floor coverings — Determination of dimensional

stability and curling after exposure to heat

Revétements de sol résilients — Détermination

de la stabilité dimensionnelle et de

l’encurvation après exposition à la chaleur

Elastische Bodenbeläge — Bestimmung der Maßänderung and Schüsselung nach Wärmeeinwirkung

This European Standard was approved by CEN on 1994-08-22 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 Central Secretariat 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

Central Secretariat has the same status as the official versions

CEN members are the national standards bodies of Austria, Belgium,

Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,

Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and

United Kingdom

CEN

European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung

Central Secretariat: rue de Stassart 36, B-1050 Brussels

© 1994 Copyright reserved to CEN members

Ref No EN 434:1994 E

EN 434:1994

© BSI 07-1999

2

Foreword

This European Standard was prepared by Technical

Committee CEN/TC 134, Resilient and textile floor

coverings, the Secretariat of which is held by BSI

This document was submitted to the formal vote and

approved

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

February 1995, and conflicting national standards

shall be withdrawn at the latest by February 1995

In accordance with the CEN/CENELEC Internal

Regulations, the following countries are bound to

implement this European Standard: Austria,

Belgium, Denmark, Finland, France, Germany,

Greece, Iceland, Ireland, Italy, Luxembourg,

Netherlands, Norway, Portugal, Spain, Sweden,

Switzerland and United Kingdom

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1 Scope

This European Standard specifies a method for

determining the dimensional stability and curling of

a resilient floor covering on exposure to heat

2 Normative references

This European Standard incorporates by dated or

undated reference, provisions from other

publications These normative references are cited

at the appropriate places in the text and the

publications are listed hereafter For dated

references, subsequent amendments to or revisions

of any of these publications apply to this European

Standard only when incorporated in it by

amendment or revision For undated references the

latest edition of the publication referred to applies

EN 428, Resilient floor coverings — Determination

of overall thickness

3 Principle

3.1 For dimensional stability, the relative variation

of the distance between marks previously made on

the test piece after heat treatment under specified

conditions is determined

3.2 For curling, the vertical deformation appearing

in a test piece after specified heat treatment is

measured

4 Apparatus

4.1 A thermostatically-controlled ventilated oven,

where the temperature throughout shall

be (80 ± 2) °C and the radiation from the heating

element shall not reach the test pieces or support

places directly

4.2 Solid metal support plates, ground and covered

with a film of polytetrafluoroethylene

The shapes and dimensions of 4.1 and 4.2 shall be

such that:

— curling shall be measured without removing

the test pieces from the support plates;

— the clearance between the plates and the

vertical walls of the oven shall be not less

than 50 mm;

— the vertical clearance between the support

plates and between the plates and the oven shall

be not less than 100 mm

4.3 An optical bench, range 200 mm and

precision ± 0,02 mm

4.4 A pillar-mounted micrometer, or other device,

accurate to at least 0,1 mm

5 Sampling and preparation of test pieces

Take a representative sample from the available material

Before cutting the test pieces, lay out the sample in sheet form as flat as possible and mark the machine direction In the case of tiles, remove these from the packaging and lay them out

Take three test pieces at equal distances from the sample, the distance between the outer edge of the sample and the nearest edge of the test piece being

at least 100 mm, each of approximate dimensions (225 to 250) mm square, their edges being parallel or transverse to the direction of manufacture On each test piece,

approximately 20 mm from the edges, scribe four lengths, two in each direction, at a distance

of (200 ± 1) mm, and measure these on an optical bench (see Figure 1)

Place each test piece on a support plate If present, measure the initial curling before carrying out the test

6 Conditioning

Condition the test pieces at a temperature

of (23 ± 2) °C and relative humidity of (50 ± 5) % for

a minimum of 24 h

Maintain these conditions when carrying out the test

Figure 1 — Scribing of test pieces

EN 434:1994

4 © BSI 07-1999

7 Procedure

Carry out the tests on the day of the initial length

measurement At least 1 h after the marks for the

dimensional variation measurements have been

made, measure the vertical distance between the

support plate and the visible surface of the test piece

in four places around the edge, usually the corners,

where the distance is greatest Carry out the

measurements with the pillar-mounted micrometer

Store the test pieces for 360 min in the oven,

which has previously been stabilized at (80 ± 2) °C

Remove the metal plates bearing the test pieces

from the oven Allow these to cool and recondition at

a temperature of (23 ± 2) °C and relative

humidity (50 ± 5) % for a further 24 h, unless

otherwise specified for the product

NOTE The reconditioning period for all cork floor coverings

should be 7 days.

After reconditioning, take the following

measurements:

a) dimensional variations, i.e the new distance of

each scribed length; and

b) curling, i.e the maximum vertical distances on

each edge, usually at the corners

8 Calculation and expression of results

8.1 Dimensional stability

For each of the test directions, record the variations

for the six length measurements (two readings from

three test pieces) Calculate the relative variation

related to the initial lengths Calculate the mean

value of the six results and express it as a

percentage to the nearest 0,05 %

8.2 Curling

Reduce each of the actual measurements by the mean thickness of the floor covering measured as specified in EN 428 Calculate the mean value of the four differences for each test piece and the mean value for the three test pieces Express the results in millimetres to the nearest 0,5 mm

9 Test report

The test report shall contain the following information:

a) a reference to this standard, i.e EN 434; b) a complete identification of the product tested, including type, source, colour and manufacturer’s reference numbers;

c) previous history of the sample;

d) the mean value of dimensional stability in each direction;

e) the mean value for curling;

f) the mean value for initial curling, if any; g) any deviation from this standard which may have affected the results

+15 0

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National annex NA (informative)

Committees responsible

The United Kingdom participation in the preparation of this European Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/60 upon which the following bodies were represented:

British Adhesives and Sealants Association

British Board of Agrément

British Floor Covering Manufacturers’ Association

British Railways Board

British Rubber Manufacturers’ Association Ltd

Consumer Policy Committee of BSI

Contract Flooring Association

Cork Industry Federation

Department of the Environment (Building Research Establishment)

Federation of Plastering and Drywall Contractors

Health Care Supplies South West

Royal Institute of British Architects

National annex NB (informative)

Cross-reference

Publication referred to Corresponding British Standard

EN 428:1992 BS EN 428:1993 Resilient floor coverings — Determination of overall thickness

BS EN

434:1994

BSI

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