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1、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 a British Standard UDC 698.7:692.535.6:645.13:620.1:536.413 BS EN 434:1994 This British Standard, having been prepar
2、ed 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
3、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: AustriaOesterreichisches Normungsinstitut BelgiumInstitut
4、 belge de normalisation DenmarkDansk Standard FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. GreeceHellenic Organization for Standardization IcelandTechnological Institute of Iceland IrelandNational Standards Authority o
5、f Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Portugus da Qualidade SpainAsociacin Espaola de Normalizacin y Certificacin SwedenStandardiseringsko
6、mmissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.DateComments BS EN 434:1994 BSI 07-1999i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 1Scope3 2Normat
7、ive references3 3Principle3 4Apparatus3 5Sampling and preparation of test pieces3 6Conditioning3 7Procedure4 8Calculation and expression of results4 9Test report4 National annex NA (informative) Committees responsibleInside back cover National annex NB (informative) Cross-referenceInside back cover
8、Figure 1 Scribing of test pieces3 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 dimensiona
9、l 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
10、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
11、 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. EUROPEAN STANDARD NORME EUROPEN
12、NE EUROPISCHE NORM EN 434 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 exp
13、osure to heat Revtements de sol rsilients Dtermination de la stabilit dimensionnelle et de lencurvation aprs exposition la chaleur Elastische Bodenbelge Bestimmung der Manderung and Schsselung nach Wrmeeinwirkung This European Standard was approved by CEN on 1994-08-22. CEN members are bound to comp
14、ly 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 Sec
15、retariat 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 off
16、icial 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 Comit Europen de
17、 Normalisation Europisches Komitee fr 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 c
18、overings, 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 natio
19、nal 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, Netherlan
20、ds, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EN 434:1994 BSI 07-19993 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 incor
21、porates 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 Euro
22、pean 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 distan
23、ce 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 t
24、emperature throughout shall be (80 o 2) pC 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: cu
25、rling 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
26、 An optical bench, range 200 mm and precision o 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
27、 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
28、 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 o 1) mm, and measure these on an optical bench (see F
29、igure 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 o 2) pC and relative humidity of (50 o 5) % for a minimum of 24 h. Maintain these conditions when carrying out th
30、e 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 vis
31、ible 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 360min in the oven, which has previously been stabilized at (80 o 2) pC. Remove the metal plate
32、s bearing the test pieces from the oven. Allow these to cool and recondition at a temperature of (23 o 2) pC and relative humidity (50 o 5) % for a further 24 h, unless otherwise specified for the product. NOTEThe reconditioning period for all cork floor coverings should be 7 days. After recondition
33、ing, 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,
34、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 measur
35、ements 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
36、 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 manufacturers reference numbers; c) previous history of the sample; d) the mean value of dimensional stability in each direction; e) the me
37、an 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 BS EN 434:1994 BSI 07-1999 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European S
38、tandard 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 Agrment British Floor Covering Manufacturers Association British Railways Bo
39、ard 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 o
40、f British Architects National annex NB (informative) Cross-reference Publication referred toCorresponding British Standard EN 428:1992BS EN 428:1993 Resilient floor coverings Determination of overall thickness BS EN 434:1994 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution
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