1、June 2009DEUTSCHE NORM English price group 10No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 83.100!$X5y“1531886www.di
2、n.deDDIN EN ISO 8067Flexible cellular polymeric materials Determination of tear strength (ISO 8067:2008)English version of DIN EN ISO 8067:2009-06Flexible Polymer-Schaumstoffe Bestimmung des Weiterreiwiderstandes (ISO 8067:2008)Englische Fassung DIN EN ISO 8067:2009-06SupersedesDIN EN ISO 8067:1995-
3、07www.beuth.depagesDocument comprises 15DIN EN ISO 8067:2009-06 2 National foreword This standard has been prepared by Technical Committee ISO/TC 45 “Rubber and rubber products”, Subcommittee SC 4 “Products (other than hoses)” (Secretariat: DSM, Malaysia) in collaboration with Technical Committee CE
4、N/TC 249 “Plastics“ (Secretariat: NBN, Belgium). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Technical Committee NA 062-04-37 AA Prfung weich-elastischer Schaumstoffe. The DIN Standards corresponding to the I
5、nternational Standards referred to in this document are as follows: ISO 1923 DIN EN ISO 1923 ISO 7500-1 DIN EN ISO 7500-1 Amendments This standard differs from DIN EN ISO 8067:1995-07 as follows: a) A paragraph “WARNING” has been included. b) Method B, using an angle test piece without a nick has be
6、en included. c) Clause 3 “Terms and definitions” has been included. d) Normative references have been updated. e) Figure 3 “Predominant foam-rise direction for angle test piece” has been included. f) Figure 4 “Schematic test arrangement” has been included. g) Annex A “Precision comparison for the tw
7、o types of test piece” has been included. Previous editions DIN EN ISO 8067: 1995-07 DIN EN ISO 8067:2009-06 3 National Annex NA (informative) Bibliography DIN EN ISO 1923, Cellular plastics and rubbers Determination of linear dimensions DIN EN ISO 7500-1, Metallic materials Verification of static u
8、niaxial testing machines Part 1: Ten-sion/compression testing machines Verification and calibration of the force-measuring system DIN EN ISO 8067:2009-06 4 This page is intentionally blank. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8067 December 2008 ICS 83.100 Supersedes EN ISO 8067:
9、1995English Version Flexible cellular polymeric materials Determination of tear strength (ISO 8067:2008) Matriaux polymres alvolaires souples Dtermination de la rsistance au dchirement (ISO 8067:2008) Flexible Polymer-Schaumstoffe Bestimmung des Weiterreiwiderstands (ISO 8067:2008) This European Sta
10、ndard was approved by CEN on 15 November 2008. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concernin
11、g such national standards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own lan
12、guage and notified to the CEN Management Centre has the same status as theofficial versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, L
13、uxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All
14、 rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 8067:2008: EContents Page Foreword 3 1 Scope . 4 2 Normative references . 4 3 Terms and definitions. 4 4 Apparatus 4 5 Test pieces 5 6 Number of test pieces 7 7 Conditioning 7 8 Procedur
15、e 7 9 Expression of results . 9 10 Test report . 9 Annex A (informative) Precision comparison for the two types of test piece .10 DIN EN ISO 8067:2009-06EN ISO 8067:2008 (E)2Foreword This European Standard shall be given the status of a national standard, either by publication of an identical text o
16、r by endorsement, at the latest by June 2009, and conflicting national standards shall be withdrawn at the latest by June 2009. 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 i
17、dentifying any or all such patent rights. This document supersedes EN ISO 8067:1995. 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, Cyprus, Czech Republic, D
18、enmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 8067:2008 has been appr
19、oved by CEN as a EN ISO 8067:2008 without any modification. This document (EN ISO 8067:2008) has been prepared by Technical Committee ISO/TC 45 “Rubber and held by NBN. rubber products” in collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is DIN EN ISO 8067:2009-0
20、6EN ISO 8067:2008 (E)3WARNING Persons using this International Standard should be familiar with normal laboratory practice. This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and
21、health practices and to ensure compliance with any national regulatory conditions. 1 Scope This International Standard specifies two methods for the determination of the tear strength of flexible cellular polymeric materials: method A, using a trouser test piece; method B, using an angle test piece
22、without a nick. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1923,
23、Cellular plastics and rubbers Determination of linear dimensions ISO 7500-1, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring system 3 Terms and definitions For the purposes of this do
24、cument, the following terms and definitions apply. 3.1 tear strength R maximum force per unit thickness observed when stretching a test piece to rupture 4 Apparatus The tear strength shall be measured on a tensile-testing machine which will indicate the force at which rupture of the test piece takes
25、 place. An automatic machine should preferably be used which draws the actual curve, or a stylus or scale should be used having an indicator that remains at the point of maximum force after rupture of the test piece. The accuracy of the test machine shall be class 2 or better as defined in ISO 7500-
26、1. DIN EN ISO 8067:2009-06EN ISO 8067:2008 (E)45 Test pieces 5.1 General The test pieces shall be free of skin, voids and flow lines. If the material exhibits a predominant direction of cellular structure (orientation of the cells), the trouser test piece shall be taken in such a way that the plane
27、of the cut subsequently made in the test piece (see Figure 1) is parallel to, and the long dimension of the cut perpendicular to, the predominant foam-rise direction and the angle test piece shall be taken in such a way that the plane of the V-shaped side of the test piece (see Figure 3) is parallel
28、 to, and the long dimension of the test piece perpendicular to, the predominant foam-rise direction. If this is not possible, the orientation of the long dimension of the cut or the V-shaped side of the test piece with respect to the predominant foam-rise direction shall be stated in the test report
29、. 5.2 Trouser test piece for method A The trouser test piece shall be a rectangular parallelepiped cut from a sheet of material with a band knife or a cutting die. Each test piece shall have the dimensions given in Figure 1 and a 45 mm to 55 mm cut shall be made at one end. The required tear length
30、(25 mm) shall be marked on the test piece. The predominant foam-rise direction for the trouser test piece is indicated by an arrow in Figure 1. Dimensions in millimetres Key 1 location of thickness measurement 2 mark indicating required tear length 3 cut made in test piece aPredominant foam-rise dir
31、ection. Figure 1 Trouser test piece DIN EN ISO 8067:2009-06EN ISO 8067:2008 (E)55.3 Angle test piece for method B The test piece shall be cut from a sheet of material of thickness 10 mm to 15 mm with a die having the dimensions and shape shown in Figure 2. The predominant foam-rise direction for the
32、 angle test piece is indicated in Figure 3. Dimensions in millimetres Key 1 location of thickness measurement of test piece cut out using die Figure 2 Angle test piece die Key 1 sheet of material 2 V-shaped side of test piece aPredominant foam-rise direction. Figure 3 Predominant foam-rise direction
33、 for angle test piece DIN EN ISO 8067:2009-06EN ISO 8067:2008 (E)66 Number of test pieces Three test pieces shall be tested. Additional test pieces may be required if the spread of results is too great (see Clause 9) or to compensate for deviation in the progress of the tear (see 8.2). 7 Conditionin
34、g Materials shall not be tested less than 72 h after manufacture, unless it can be demonstrated that the mean results obtained at either 16 h or 48 h after manufacture do not differ by more than 10 % from those obtained after 72 h, in which case testing is permitted at either 16 h or 48 h, respectiv
35、ely. Prior to the test, the test pieces or the material from which the test pieces are to be cut shall be conditioned for at least 16 h in one of the following atmospheres, unless otherwise specified: (23 2) C, (50 5) % relative humidity; (27 2) C, (65 5) % relative humidity. This conditioning perio
36、d may form the final part of or, in the case of testing 16 h after manufacture, the whole of the period following manufacture. In the case of quality-control tests, test pieces may be taken a shorter time (down to a minimum of 12 h) after manufacture and testing carried out after conditioning for a
37、shorter period (down to a minimum of 6 h) in one of the atmospheres specified above. It is recommended that, for referee purposes, the test is performed 7 days or more after the cellular material has been manufactured. 8 Procedure 8.1 General After conditioning as specified in Clause 7, measure, in
38、accordance with ISO 1923, the thickness of the test piece at the location shown in Figure 1 or Figure 2. 8.2 Method A 8.2.1 Clamp the test piece in the jaws of the test machine, taking care that the jaws grip the test piece properly. Spread the ends of the test piece so that the force is applied in
39、the direction shown in Figure 4. Start the test machine with a jaw speed of 50 mm/min to 500 mm/min. DIN EN ISO 8067:2009-06EN ISO 8067:2008 (E)7Key 1 held in fixed clamp 2 held in moving clamp aDirection of applied force. Figure 4 Schematic test arrangement 8.2.2 Where necessary in order to keep th
40、e cut in the centre of the test piece while tearing, aid it with light application of a sharp blade, for example a single-edged razor blade. Cutting should be the exception and should be avoided because it could influence the result. Care should be taken when using blades. 8.2.3 When the tear has tr
41、avelled (25 5) mm along the test piece, record the maximum force on the dial or scale. If rupture occurs before a length of 20 mm is torn, reject the test piece and take a fresh one. 8.2.4 For referee purposes, a jaw speed of (50 5) mm/min shall be used. 8.3 Method B 8.3.1 Clamp the test piece in th
42、e jaws of the test machine, taking care to adjust it so that it is symmetrical, in order that the tension will be distributed uniformly over the cross-section. 8.3.2 Start the test machine with a jaw speed of 50 mm/min to 500 mm/min and record the maximum force. 8.3.3 For referee purposes, a jaw spe
43、ed of (500 50) mm/min shall be used. DIN EN ISO 8067:2009-06EN ISO 8067:2008 (E)89 Expression of results The tear strength R, expressed in newtons per centimetre (N/cm), is given by the following equation: 10FRd= where F is the maximum force, in newtons (N), registered on the test machine; d is the
44、original thickness, in millimetres (mm), of the test piece. Report the result as the median of the tear strength values calculated for the three test pieces. If one or more values deviates by more than 20 % from the median, test two additional test pieces and report the median of all five values. 10
45、 Test report The test report shall include the following information: a) a reference to this International Standard; b) a description of the material tested and the type of test piece used; c) the conditioning used; d) the jaw speed used; e) the location of the plane of the cut with respect to the p
46、redominant rise direction of the cellular structure; f) any deviation of the progress of the tear (causing extra test pieces to be tested); g) the median value of the tear strength; h) the date of testing. DIN EN ISO 8067:2009-06EN ISO 8067:2008 (E)9Annex A (informative) Precision comparison for the
47、 two types of test piece A.1 Comparative trial Two types of test piece (the trouser type and the angle type without a nick) were used in the comparative trial. Two types of flexible polyurethane foam were used: sample A: 22 kg/m3general-purpose polyether; sample B: 32 kg/m3high-hardness polyether. A
48、ll the test pieces of a given type of foam were taken from the same test sample using a band knife and die-cutting. Testing was carried out in three laboratories in Japan on two days in different weeks. The conditioning and test methods were in accordance with this International Standard. A.2 Test r
49、esults and precision data for each type of test piece A.2.1 General The test results and the precision data for the two types of test piece are shown in Tables A.1 and A.2. The precision data in Table A.2 were calculated in accordance with ISO/TR 9272, Rubber and rubber products Determination of precision for test method standards. The precision results given in Table A.2 should not be used for the acceptance or rejection of any group of materials without documentation that the results of this precision
