1、BRITISH STANDARD Resilient and laminate floor coverings Castor chair test The European Standard EN 425:2002 has the status of a British Standard ICs 97.150 BS EN 425:2002 WkNb A%“ U- rn% E rn NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW $ present to the responsible European
2、 committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this committee can be obtained on request to its secretary. Cro
3、ss-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electron
4、ic Catalogue. 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 ofitself confer immunity from legal obligations. Summary of pages This docume
5、nt comprises a front cover, an inside front cover, the EN title page, pages 2 to 7 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. OBSI 13 May 2002 ISBN O 580 39693 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 425 April 2002
6、ICs 97.150 Supersedes EN 4251994 English version Resilient and laminate floor coverings - Castor chair test Revtements de sol rsilients et stratifis - Essai de la chaise roulettes Elastische Bodenbelge und Laminatbden - Stu hlrollenversuch This European Standard was approved by CEN on 23 February 20
7、02. CEN members are bound to comply with the CENKENELEC 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 o
8、n application to the 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 Management Centre ha
9、s the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN
10、 COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2002 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4252002 E EN 425:2002 (E) Fo
11、reword This document EN 4252002 has been prepared by Technical Committee CEN/TC 134 “Resilient and textile floor coverings“, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement,
12、 at the latest by October 2002, and conflicting national standards shall be withdrawn at the latest by October 2002. This document supersedes EN 4251994. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Euro
13、pean Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. 2 EN 425:2002 (E) 1 Scope This European Standard specifies a method for determinin
14、g the change of appearance and stability of a resilient floor covering or a laminate floor covering, including joints, under the movement of a castor chair. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative r
15、eferences 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
16、 the latest edition of the publication referred to applies (including amendments). EN 423, Resilient floor coverings - Determination of the effect of stains. EN 684, Resilient floor coverings - Determination of seam strength. EN 12529: 1998, Castors and wheels - Castors for furniture - Castors for s
17、wivel chairs - Requirements. 3 Principle A resilient floor covering or a laminate floor covering, including one or more joints, treated or welded where necessary, is subjected to the simulated movement of a castor chair. The castors move in epicycloidal paths with multiple changes of direction, stop
18、s and starts, and the frequency of passage varies from area to area. 4 Apparatus and materials 4.1 Castor chair apparatus, comprising the following (see Figure 1) : O 4.1.1 rotation shall be reversed every 60 r, with a pause of 5 s before restarting; Circular plate, of minimum diameter 750 mm, that
19、rotates at a speed of 20 r/min. The direction of 4.1.2 Triangular mobile platform, rotating in the same direction as the circular plate, at a faster nominal speed of 50 r/min. The platform shall be in contact with the test piece via a load exerted by a total mass of 90 kg (including the mass of the
20、components) equally distributed between three castors; 4.1.3 Castor set, comprising three castors with the following dimensions: diameter of castors width of castors radius of curvature of castor tread crank distance distance between any two castor mountings (50 f 2) mm (20 f 2) mm (130f 5) mm (32 f
21、 2) mm (225 f 5) mm The castors shall be Type W, soft tread, in accordance with 4.2.2 and 5.4.4.2 of EN 12529:1998. The castor treads shall be made from polyurethane and the surfaces of the castor wheels shall be smooth, without any deep scoring or hard encrusted particles. The castor treads shall b
22、e examined after each test and replaced as necessary. NOTE The path taken by each castor is shown in Figure 2. 3 EN 425:2002 (E) 4.1.4 Suction device, with the height of its nozzles being adjustable 4.1.5 8 mm acrylic glass A base for the test piece, consisting of either an 8 mm plywood board or a 6
23、 mm fibre cement board or an 4.2 Vacuum cleaner 4.3 Illumination device, as specified in EN 423 4.4 Rotary viewing table, as specified in EN 423 4.5 Materials 4.5.1 White cotton, in pad or cloth form 4.5.2 Adhesive or double-sided adhesive tape 4.5.3 Denatured ethanol Dimensions in millimetres J 5 1
24、 Total mass 90 kg 2 Distance 3 mm 3 Load/drive plate 4 Castor mounting plate 5 Chain 6 Specimen 7 Suction nozzle with adjustable height 8 Testing platform 9 Specimen support Figure 1 - Castor chair test apparatus 4 EN 425:2002 (E) ? Figure 2 - Path of castors 5 Sampling and preparation of test piece
25、s Take a representative sample from the available material Take one test piece which shall be installed using either double-sided adhesive tape or with adhesive in accordance with the manufacturers instructions. The diameter of the test piece shall be at least 750 mm. NOTE joint(s) is as shown in Fi
26、gure 3. Where necessary, joints should be treated in accordance with the manufacturers instructions. A position of the 6 Conditioning Condition the test piece at a temperature of (23 f 2) OC and relative humidity of (50 f 5) % for a minimum of 24 h. 5 EN 425:2002 (E) Dimensions in millimetres 1 d=83
27、 Key 1 Joint Figure 3 - Position of joint(s) 7 Procedure Inspect the surface of the castors, and, if necessary, clean them with a cotton pad impregnated with denatured ethanol, and dry them. Pre-clean the test piece with a vacuum cleaner Fix the base for the test piece on the circular plate, and low
28、er the triangular platForm to allow the castors to come into contact with the test piece. Preset the counter for 25 O00 revolutions of the plate and set the apparatus in motion with the suction device being operated continuously. Carry out the test within the temperature range of 18 OC to 25 OC NOTE
29、 The duration of the test is approximately 24 h. At the end of the test, examine the test piece for appearance change from a distance of approximately 800 mm at an approximate angle of 45“ and from all directions by slowly rotating the viewing table. Record any damage caused by detachment of layers,
30、 opening of joints, or crazing. Ignore any flattening or change in appearance, e.g. change in gloss. If it is intended to carry out tensile tests on the treated or welded joints, cut out a strip with the joint in the centre. Separate the test piece slowly from the base by rolling it on a mandrel of
31、approximate diameter 50 mm. Carry out the test in accordance with EN 684. 8 Expression of results Express the type of damage for the test piece. If carried out, express the result of the seam strength test in N/50 mm. 6 EN 425:2002 (E) 9 Testreport The test report shall contain the following informa
32、tion: a reference to this standard, .e. EN 425; complete identification of the product tested, including type, source, colour and manufacturers reference numbers; previous history of the sample; type of adhesive used in the test; nature of damage observed; seam strength test results, if carried out;
33、 any deviation from this standard which may have affected the results. 7 BS EN 425:2002 B SI 389 Chiswick High Road London w4 4AL BSI -British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at
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