1、BS EN ISO 5402-1:2017Leather Determination offlex resistancePart 1: Flexometer method (ISO5402-1:2017)BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN ISO 5402-1:2017 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 5402-
2、1:2017. It supersedes BS EN ISO 5402-1:2011 which iswithdrawn.The UK participation in its preparation was entrusted to Technical Committee TCI/69, Footwear, leather and coated fabrics.A list of organizations represented on this committee can be obtained on request to its secretary.This publication d
3、oes not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017.Published by BSI Standards Limited 2017ISBN 978 0 580 86626 5 ICS 59.140.30 Compliance with a British Standard cannot confer immunity from
4、legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2017.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 5402-1 February 2017 ICS 59.
5、140.30 Supersedes EN ISO 5402-1:2011English Version Leather - Determination of flex resistance - Part 1: Flexometer method (ISO 5402-1:2017) Cuir - Dtermination de la rsistance la flexion - Partie 1: Mthode au flexomtre (ISO 5402-1:2017) Leder - Bestimmung der Dauerbiegefestigkeit - Teil 1: Flexomet
6、er-Verfahren (ISO 5402-1:2017) This European Standard was approved by CEN on 21 December 2016. 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-da
7、te lists and bibliographical references concerning such national standards 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
8、 under the responsibility of a CEN member into its own language and 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, For
9、mer Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATI
10、ON COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 5402-1:2017 EBS EN ISO 5402-1:2017EN ISO 540
11、2-1:2017 (E) 3 European foreword This document (EN ISO 5402-1:2017) has been prepared by Technical Committee IULTCS “International Union of Leather Technologists and Chemists Societies“ in collaboration with Technical Committee CEN/TC 289 “Leather” the secretariat of which is held by UNI. This Europ
12、ean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2017 and conflicting national standards shall be withdrawn at the latest by August 2017. Attention is drawn to the possibility that some of the element
13、s of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 5402-1:2011. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the followin
14、g countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norw
15、ay, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 5402-1:2017 has been approved by CEN as EN ISO 5402-1:2017 without any modification. BS EN ISO 5402-1:2017ISO 5402-1:2017(E)IULTCS/IUP 20:2017(E)Fo
16、reword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 15 Apparatus and reagents 16 Sampling and sample preparation 37 Procedure. 38 Test report . 5Annex A (informative) Sources of apparatus . 7 ISO 2017 All rights reserved iiiContents PageBS EN ISO 5402-1:2017ISO 5402-1:
17、2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for whi
18、ch a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all m
19、atters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This
20、document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or
21、 all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of use
22、rs and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
23、URL: www .iso .org/ iso/ foreword .html.ISO 5402-1 was prepared by the Physical Test Commission of the International Union of Leather Technologists and Chemists Societies (IUP Commission, IULTCS) in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 289, L
24、eather, the secretariat of which is held by UNI, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).IULTCS, originally formed in 1897, is a world-wide organization of professional leather societies to further the advancement of leather science and techno
25、logy. IULTCS has three Commissions, which are responsible for establishing international methods for the sampling and testing of leather. ISO recognizes IULTCS as an international standardizing body for the preparation of test methods for leather.This second edition cancels and replaces the first ed
26、ition (ISO 5402-1:2011), which has been technically revised.Subclauses 5.1, 5.1.1, 5.1.2, 7.2 to 7.6 have been technically revised.A list of all parts in the ISO 5402 series can be found on the ISO website.IULTCS/IUP 20:2017(E)iv ISO 2017 All rights reservedBS EN ISO 5402-1:2017INTERNATIONAL STANDAR
27、DISO 5402-1:2017(E)IULTCS/IUP 20:2017(E)Leather Determination of flex resistance Part 1: Flexometer method1 ScopeThis document specifies a method for determining the wet or dry flex resistance of leather and finishes applied to leather. It is applicable to all types of flexible leather below 3,0 mm
28、in thickness.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced documen
29、t (including any amendments) applies.ISO 2418, Leather Chemical, physical and mechanical and fastness tests Sampling locationISO 2419, Leather Physical and mechanical tests Sample preparation and conditioningISO 3696, Water for analytical laboratory use Specification and test methods3 Terms and defi
30、nitionsNo terms and definitions are listed in this document.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp4
31、 PrincipleA test piece is folded with the surface to be tested inwards and clamped in an upper movable clamp and with the surface to be tested outwards in a lower fixed clamp. Movement of the upper clamp causes a fold in the test piece to run along it. The test piece is examined periodically for dam
32、age.5 Apparatus and reagents5.1 Test machine, consisting of a movable upper clamp, a fixed lower clamp and a counter as described in 5.1.1 to 5.1.3 and as shown in Figure 1 and Figure 2.5.1.1 Upper clamp, consisting of a pivoting pair of flat plates of 4 mm thickness as shown in Figure 1.The small p
33、late (H) has the basic shape of a trapezium but with a radius of 2 mm at the acute corner. It has a ledge (G) to support the folded test piece. The larger plate (I) has a shape as shown in Figure 1. The clamp tightening screw (F) tightens the plates together and also acts as a stop to prevent the te
34、st piece from being incorrectly positioned. The design of the clamp should ensure that the two faces of the clamp remain parallel when clamping the test piece. The upper clamp is reciprocated by a motor about a horizontal axle, descending through an angle (A) of (22,5 0,5) at a frequency of (100 5)
35、cycles/min. ISO 2017 All rights reserved 1BS EN ISO 5402-1:2017ISO 5402-1:2017(E)5.1.2 Lower clamp, fixed and lying directly beneath (planar to) the upper clamp and consisting of a pair of flat plates (B and C) to hold the test piece.The position of the lower clamp is such that the vertical distance
36、 (D) between the upper side of the ledge (G) of the upper clamp and the upper edge of the fixed lower clamp, when the upper clamp is horizontal, is (25,0 0,5) mm.5.1.3 Counter, to indicate the number of cycles.Dimensions in millimetresKeyA flexing angle (22,5 0,5)B fixed part of fixed lower clampC m
37、ovable part of fixed lower clampD vertical positioning of fixed part of movable upper clamp and fixed part of fixed lower clampE horizontal axle (pivot point)F clamp tightening screwsG ledge (for testing of thick test pieces, the ledge can be increased to more than 8 mm)H small part of upper clamp w
38、ith ledge (G)I large part of upper clampFigure 1 Upper (movable) and lower (fixed) clamp5.2 Press knife, conforming to the requirements of ISO 2419, the inner wall of which is a rectangle (70 1) mm (45 1) mm.IULTCS/IUP 20:2017(E)2 ISO 2017 All rights reservedBS EN ISO 5402-1:2017ISO 5402-1:2017(E)5.
39、3 Magnifier, with a magnification of four to six times.5.4 Desiccator, or other vessel that can be evacuated.5.5 Vacuum pump, capable of reducing the pressure in the desiccator to less than 4 kPa.5.6 Distilled or deionized water, conforming to the requirements of grade 3 of ISO 3696.5.7 Glass dishes
40、, minimum diameter 100 mm and minimum depth 25 mm.5.8 Mandrel, diameter 10 mm and minimum length 70 mm.5.9 Metal clip, 70 mm wide, capable to fix a test piece bent around the mandrel (5.8) with slight stretch.5.10 Stereo microscope, with a magnification of 25 times.6 Sampling and sample preparation6
41、.1 Sample in accordance with ISO 2418. From the sample, cut a minimum of four pieces for dry test and/or four pieces for wet test by applying the press knife (5.2) to the surface to be tested. Cut a minimum of two test pieces with the long edge parallel to the backbone and two with the long edge per
42、pendicular to the backbone.If there is a requirement for more than two hides or skins to be tested in one batch, then only one test piece in each direction need be taken from each hide or skin, provided that the overall total is not less than three pieces in each direction.6.2 For dry flex testing,
43、condition the test pieces in accordance with ISO 2419 and test in the conditioned atmosphere.6.3 For wet flex testing, place the test pieces in a glass dish (5.7), add sufficient distilled or deionized water (5.6) to give a minimum depth of 10 mm, put the dish in the desiccator and reduce the pressu
44、re to below 4 kPa for 2 min.Restore to normal atmospheric pressure and repeat the pressure reduction/restoration twice. Remove the test piece and remove excess water using blotting paper. Carry out wet flexing without delay.NOTE It is not possible to clamp thick leathers in the upper clamp. In such
45、cases, the thickness of the test piece is reduced for a maximum length of 15 mm from one end only and this end inserted in the upper clamp, even so the leather is too stiff to be tested by this method.7 Procedure7.1 Open the upper and lower clamps (5.1.1 and 5.1.2) so that the gap is at least twice
46、the thickness of the test piece.7.2 Turn the motor until the lower edge of the upper clamp (5.1.1) is parallel to the upper edge of the fixed lower clamp (5.1.2) as shown in Figure 1 (the point at which the direction of rotation of the horizontal axle changes).7.3 Fold the test piece in half lengthw
47、ise, such that the two long edges are brought together exactly and the gain surface meets face to face. Clamp the folded test piece as shown in Figure 2 a) with the folded edge parallel to, and positioned against, the ledge and with the end of the test piece against the stop IULTCS/IUP 20:2017(E) IS
48、O 2017 All rights reserved 3BS EN ISO 5402-1:2017ISO 5402-1:2017(E)formed by the clamping screw. It has to be ensured that the corners of the test piece within the upper clamp are securely fixed and cannot slip during the test.Keya sample in upper clampb sample folded backc sample fixed with two fin
49、gers in on upper clampd sample fully clampedFigure 2 Loading of the test piece7.4 Draw the free corners of the test piece outward and downward around the clamp as shown in Figure 2 b). Bring the inner surfaces together and place the free end in the opened lower clamp.7.5 Press the test piece against the outer surfaces of the upper clamp as shown in Figure 2 c). It is important to ensure that the test piece is in contact with the 45 sloping face of the clamp. This ensures that the lower part of the test piece is perpe
