1、BRITISH STANDARD BS EN ISO 24344:2012Resilient floor coverings Determination of flexibility and deflectionICS 97.150nullnull nullnullnullnullnullnullnull nullnullnullnullnullnullnull nullnullnull nullnullnullnullnullnullnullnullnullnull nullnullnullnullnullnull nullnull nullnullnullnullnullnullnulln
2、ullnull nullnull nullnullnullnullnullnullnullnullnull nullnullnullThis British Standard is the UK implementation of EN ISO 24344:2012. It is identical to ISO 24344:2008. It supersedes BS ISO 24344:2008 and BS EN 435:1994, which are withdrawn.The UK participation in its preparation was entrusted to T
3、echnical Committee PRI/60, Resilient floor coverings.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance
4、 with a British Standard cannot confer immunity from legal obligations.BS EN ISO 24344:2012This British Standard waspublished under the authorityof the Standards Policy andStrategy Committeeon 30 April 2008 The British Standards Institution 2012. Published by BSI Standards Limited 2012.Amendments/co
5、rrigenda issued since publicationDate Comments 31 March 2012 This corrigendum renumbers BS ISO 24344:2008 as BS EN ISO 24344:2012ISBN 978 0 580 75239 1National forewordEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 24344 February 2012 ICS 97.150 Supersedes EN 435:1994English Version Resili
6、ent floor coverings - Determination of flexibility and deflection (ISO 24344:2008) Revtements de sol rsilients - Dtermination de la flexibilit et de la dformation (ISO 24344:2008) Elastische Bodenbelge - Bestimmung der Flexibilitt und Durchbiegung (ISO 24344:2008) This European Standard was approved
7、 by CEN on 24 December 2011. 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 s
8、tandards 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 an
9、d 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, Li
10、thuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brus
11、sels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 24344:2012: EForeword The text of ISO 24344:2008 has been prepared by Technical Committee ISO/TC 219 “Floor coverings” of the International Organization for Standardizat
12、ion (ISO) and has been taken over as EN ISO 24344:2012 by Technical Committee CEN/TC 134 “Resilient, textile and laminate 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 b
13、y endorsement, at the latest by August 2012, and conflicting national standards shall be withdrawn at the latest by August 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for
14、identifying any or all such patent rights. This document supersedes EN 435:1994. 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 Republ
15、ic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 24344:2008
16、 has been approved by CEN as a EN ISO 24344:2012 without any modification. iBS EN ISO 24344:2012 EN ISO 24344:2012 (E)iiContents PageForeword iv1Scope. 12Terms and definitions. 13Principle. 14Apparatus 15Sampling and selection of specimens for both methods. 36Atmosphere for conditioning and testing
17、37Test procedure 38Expression of results for both methods. 49Test report.510 Precision and bias statement 5Bibliography. 6BS EN ISO 24344:2012 EN ISO 24344:2012 (E)This page deliberately set blankBS EN ISO 24344:2012 EN ISO 24344:2012 (E)1Resilient floor coverings Determination of flexibilityand def
18、lection1 Scope This International Standard specifies methods for determining the flexibility and deflection of resilient floorcoverings. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply.2.1 flexibilityabilityof a resilient floor covering to be bent
19、 without breaking or cracking 3 Principle 3.1MethodA (for determining flexibility)The test piece shall be bent 180 around a mandrel under specified conditions. 3.2Method B (for determining deflection)The test piece is deformed with a cylinder with a radius of curvature much greater than the test pie
20、ce thickness by a force centred between two fixed supports. 4 Apparatus 4.1 Method A4.1.1 Fixed metal mandrels , with nominal diameters ( 0,05 mm) asfollows: 120, 110, 100, 90, 80, 70, 60, 55, 50, 45, 40, 35, 30, 25, 20, 15, 10, 7 mm (see Figure 1). The contacting faces of the rods shall be a minimu
21、m of 60 mm in length. 4.1.2Stand or other device, to firmly support the mandrel in a horizontal position during the test. 4.1.3 Die or knife or similar , to prepare test specimens with uniform smooth edges. BS EN ISO 24344:2012 EN ISO 24344:2012 (E)2 Key1 mandrel 2 support Figure 1 Mandrel4.2 Method
22、 B4.2.1 Test piece stand (deflection frame), as shown in Figures 2 and 3, comprising two metal cylinders,ofdiameter 8 mm and minimum length 60 mm, with a distance of 150 5 mm between the two axes of the cylinders.4.2.2 Tensile test apparatus, capable of holding the test piece stand. 4.2.3 Parallel b
23、ar with a radius of 4 mm, centred between the two cylinders, which can be displaced inthe vertical plane of symmetryof the stand at a speed of (100 5) mm/min and a movement of at least 65 mm at a load of 4,5 kg. 4.2.4 Cutting device, for cutting the samples to 50 mm 250 mm. 4.2.5 Water bath, capable
24、 of maintaining a temperature of (25 0,5) C. Dimensions in millimetres Key1 steel bar radius, r = 4 mm2 load 3 specimen 4 steel bar, r = 4 mm 5 dial gauge 6 loading bar Figure 2 First example of deflection frame BS EN ISO 24344:2012 EN ISO 24344:2012 (E)3Dimensions in millimetres Key1 deflection, mm
25、 Figure 3 Second example of deflection frame5 Sampling and selection of specimens for both methods Take a representative sample from the material to be tested. Take six specimens from each sample, each measuring 250 mm 50 mm, at equal distances fromeach other. The distance between the outer edge of
26、the test specimen being at least 100 mm.Take three specimens in the direction of manufacture and three in the transverse direction. Prepare the specimen by means of a die, knife, or other similar instrument, so as to produce uniform smoothedges. Specimens with nicked or fractured edges should not be
27、 tested. If necessary, place the sample in an oven at 30 C for 15 min before cutting the test pieces. Ensure that the edges of the test pieces are clean-cutwithout notches. 6 Atmosphere for conditioning and testing 6.1 Method ACondition the test pieces and mandrels at a temperature of (23 2) C and (
28、50 5) %relative humidityfor 24 h and perform the test in the same environment. Specimens shall be flat and conditioned on a flat surface not leaving any curvature.6.2 Method BStore the test pieces in a water bath at 25 C 0,5 C for a minimum of 3 h before testing. 7 Test procedure 7.1 Method A7.1.1 P
29、lace the test piece overa mandrel with the wearing surface facing out and with the major axis of thespecimen perpendicular to the major axis of the mandrel. 7.1.2 Holding the specimen at each end, bend the material around the mandrel through an angle of 180 at a uniform rate within 3 s to 5 s to com
30、plete the bend. Maintain a good contact between the specimen and mandrel. 7.1.3 At the completion of the bending operation, examine the specimen face visually in the bent position for breaks, cracks, or other damage. When required by the detailed specification, straighten the specimen atthe same rat
31、e at which it was bent, and examine the back for the same faults. BS EN ISO 24344:2012 EN ISO 24344:2012 (E)4 If the machine direction cannot be determined b ythe appearance of the material, three s pecimens shall be cut parallel to one edge of the material and three shall be cut perpendicular to th
32、at edge. Report that the machine direction could not be determined. 7.1.4 Repeat the steps in 7.1.1 to 7.1.3, with the specimen face inside against the mandrel. Examine the back visually,while the specimen is still in the bent position, for cracks, breaks, or other damage. Then straighten the specim
33、en and examine the wearing surface. Use fresh specimens for the part of the testwiththe specimen face inward. 7.2 Method B7.2.1 Ensure that the deflection speed of the tensile test apparatus is 100 5 mm/min. 7.2.2 Centre the test piece in the frame. 7.2.3 Ensure that the three barsare parallel and t
34、hat the centre-bar isaccurately centred between the two outside bars. Position the frame so that the test sample can be placed with the wearing surface touching the centre-bar, and the back surface touching the two other bars, without deflection of the sample. This is the zero point for measuring de
35、flection. 7.2.4 Ensure that the deflection-measuring device accurately measures the relative movement between the centre-bar and the frame holding the two outer bars.7.2.5 Start the machine and record the deflection at the point where the sample breaks, or pulls free fromthe outer bars. Record the d
36、eflection to the nearest 1,0 mm. Remove the sample from the apparatus, and return the deflection frame to the zero point described in 7.2.3. Repeat the process described above on the next test piece and start testing it. NOTE If a pendulum weighing system is used on the testmachine, which has apprec
37、iable movement of the attachedjaw, the mechanism can be locked in place to make measurement of the deflection easier, and maintain the specifieddeflection rate, since measurement of the load is not required. Electronic load cell machines usually have negligiblemovement. 8 Expression of results for b
38、oth methods Report the results of the tests as cracking or not cracking, ignoring anyeffects within 10 mm of the edges of the test piece. 8.1 Method AWhen the material is required to pass a specified mandrel, report the passing or failing of each test piecerelative to this mandrel. The pass criteria
39、 is that neither the face nor the backmay exhibit breaks, cracks, orother permanent damage (a different size mandrel may be specified for the machine- and cross-machine direction). If no mandrel diameter is specified, report the smallest mandrel around which the material maybe bent without showing b
40、reaks, cracks or other permanent damage. 8.2 Method BRecord the maximum deflection on the dial gauge at break for each test piece. BS EN ISO 24344:2012 EN ISO 24344:2012 (E)59 Test reportThe test report shall contain the following information:a) a reference to this International Standard, ISO 24344,
41、 Method A or B; b) a complete identification of the product tested, including type, source, colour and manufacturersreference numbers;c) previous history of the sample; d) formethod A, the appearance of cracking, etc. after testing with the specified product mandrel, togetherwith the diameter of the
42、 mandrel used; e) formethod B, whether ornot cracking has occurred at a specific deflection;f) deflection for each specimen, information about the direction of the long dimension of the sample (that is,the machine direction or across-machine direction); g) anydeviation from this International Standa
43、rd which mayhave affected the results;h) the date of the test. 10 Precision and bias statementDue to the subjective nature of these test methods, no precision and bias can be established. BS EN ISO 24344:2012 EN ISO 24344:2012 (E)6 Bibliography1 EN 435, Resilient floor coverings Determination of fle
44、xibility2 ASTM F 137-03, Standard Test Method for Flex ibility of Resilient Flooring Mater ials with CylindricalMandrel Apparatus3 ASTM F 1304-03, Standard Test Method for Deflection of Resilient Floor Tile4 JIS A 1454, Test methods Resilient floor coveringsBS EN ISO 24344:2012 EN ISO 24344:2012 (E)
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