1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 5403-2:2011Leather Determination ofwater resistance of flexibleleatherPart 2: Repeated angular compression(Maeser) (ISO 5403-2:2011)BS EN ISO 5403-2:2011 BRITISH STANDA
2、RDNational forewordThis British Standard is the UK implementation of EN ISO5403-2:2011.The UK participation in its preparation was entrusted to TechnicalCommittee TCI/69, Footwear, leather and coated fabrics.A list of organizations represented on this committee can beobtained on request to its secre
3、tary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012ISBN 978 0 580 70253 2ICS 59.140.30; 61.060Compliance with a British Standard cannot confer immunity fromlegal obligati
4、ons.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2012.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 5403-2 December 2011 ICS 59.140.30; 61.060 English Version Leathe
5、r - Determination of water resistance of flexible leather - Part 2: Repeated angular compression (Maeser) (ISO 5403-2:2011) Cuir - Dtermination de limpermabilit leau des cuirs souples - Partie 2: Compression angulaire rpte (Maeser) (ISO 5403-2:2011) Leder - Bestimmung der Wasserbestndigkeit von flex
6、iblem Leder - Teil 2: Winkelbiegeverfahren (ISO 5403-2:2011) This European Standard was approved by CEN on 14 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 wi
7、thout any alteration. Up-to-date 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 othe
8、r language made by translation 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,
9、Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMA
10、LISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 5403-2:2011: EBS EN ISO 5403-2:2011EN ISO 5403-2:2011 (E) 3 Foreword This documen
11、t (EN ISO 5403-2:2011) has been prepared by Technical Committee CEN/TC 289 “Leather”, the secretariat of which is held by UNI, in collaboration with the International Union of Leather Technologists and Chemists Societies. This European Standard shall be given the status of a national standard, eithe
12、r by publication of an identical text or by endorsement, at the latest by June 2012, and conflicting national standards shall be withdrawn at the latest by June 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 CENE
13、LEC shall not be held responsible for identifying any or all such patent rights. 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
14、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 and the United Kingdom BS EN ISO 5403-2:2011ISO 5403-2:2011(E) IULTCS/IUP 10-
15、2:2011(E) ISO 2011 All rights reserved iiiForeword ISO (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
16、body interested in a subject for which 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 Electr
17、otechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted
18、 by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
19、rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 5403-2 was prepared by the European Committee for Standardization (CEN) Technical Committee CEN/TC 289, Leather, in collaboration with the Physical Test Commission of the International Union of Leather Techn
20、ologists and Chemists Societies (IUP Commission, IULTCS), 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
21、and technology. 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. ISO 5403 consists of the following parts,
22、under the general title Leather Determination of water resistance of flexible leather: Part 1: Repeated linear compression (penetrometer) Part 2: Repeated angular compression (Maeser) BS EN ISO 5403-2:2011BS EN ISO 5403-2:2011INTERNATIONAL STANDARD ISO 5403-2:2011(E)IULTCS/IUP 10-2:2011(E) ISO 2011
23、All rights reserved 1Leather Determination of water resistance of flexible leather Part 2: Repeated angular compression (Maeser) 1 Scope This part of ISO 5403 specifies a method for determining the dynamic water resistance of leather by means of repeated angular compression. It is applicable to all
24、flexible leathers but is particularly suitable for leathers intended for footwear applications. It uses a Maeser-type machine and includes an option for electronic detection. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated r
25、eferences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 2418, Leather Chemical, physical and mechanical and fastness tests Sampling location ISO 2419, Leather Physical and mechanical tests Sample prepara
26、tion and conditioning ISO 3696:1987, Water for analytical laboratory use Specification and test methods 3 Principle A square test specimen is folded and secured in two V-shaped clamps which have closed ends so as to form a trough. The trough is then immersed in water and the clamp at one end oscilla
27、tes at a constant speed so that the specimen is repeatedly flexed. The test is stopped at the first sign of water penetration through the test specimen or by means of electronic detection. NOTE This test method uses folding-type flexing, whereas the test method of ISO 5403-1 for water resistance imp
28、arts compression-type flexing on the leather specimens. Given the two completely different flexing actions, it is not possible to compare the results obtained from the two test methods. 4 Apparatus, reagents and materials Usual laboratory apparatus is required and, in particular, the following. 4.1
29、Maeser-type machine, whith one or more pairs of V-shaped clamps, which are set 63 mm 3 mm apart in the same horizontal plane, into which the test specimen can be clamped. 4.1.1 Each clamp shall have two parts as described in 4.1.1.1 and 4.1.1.2. 4.1.1.1 An outer part comprising a “V” form with an in
30、ternal angle of 31 1, an internal tip radius of 7,5 mm 0,5 mm and a closed back to the “V” which is impermeable to water. BS EN ISO 5403-2:2011ISO 5403-2:2011(E) IULTCS/IUP 10-2:2011(E) 2 ISO 2011 All rights reserved4.1.1.2 An inner part having the shape and size that shall complement the outer part
31、. 4.1.2 One clamp is stationary. 4.1.3 One clamp shall pivot about a point X which is midway (31,5 mm 1,5 mm) between the clamps such that the lower end of the clamps move together (see Figure 1). 4.1.4 The pivot point X (see Figure 1) shall be 54,0 mm 0,5 mm above the internal face of the clamp at
32、the tip of the “V” and the flexing angle through which the clamp moves shall be 32 2. Dimensions in millimetres Key 1 stationary clamp 2 moveable clamp 3 test piece X pivot point Figure 1 Side view of test specimen in V-shaped clamps (tolerances on dimensions given in the text) 4.1.5 A method of app
33、lying a simple harmonic motion to the moveable clamp (4.1.3) so that it pivots toward the stationary clamp (4.1.2) and back to its original position at a rate of (90 5) cycles/min. 4.1.6 A means of counting the number of cycles of the moveable clamp (4.1.3). 4.1.7 A method of containing a fixed quan
34、tity of water or electrolyte (4.3) around the two clamps (4.1.2 and 4.1.3) so that the water level can be adjusted to the recommended height. 4.2 Press knife, conforming to the requirements of ISO 2419, or other cutting device, capable of cutting square test specimens at least 100 mm 100 mm so that
35、they fit correctly into the V-clamps and can be fixed so no water penetrates at the edge during the flexing. 4.3 Distilled or deionized water at (20 5) C, of grade 3 in accordance with ISO 3696, or, if electronic detection is used, an electrolyte comprising 1 g/l sodium chloride solution at (20 5) C
36、. 4.4 Thin strips of compressible impermeable material, such as soft rubber or plasticine, of width approximately 10 mm and thickness approximately 1 mm, may be necessary to prevent water seeping between the test specimen and the clamps (4.1.2 and 4.1.3). BS EN ISO 5403-2:2011ISO 5403-2:2011(E) IULT
37、CS/IUP 10-2:2011(E) ISO 2011 All rights reserved 34.5 Rubber solution, or a similar type of compound, which may be necessary for sealing the edges of the test specimens. 4.6 Electronic detection, if used. 4.6.1 Electrical system, using a high-potential electrode and a common electrode, and which sha
38、ll stop the test when water penetration is detected as a fall in resistance between the electrodes to below 50 000 . An electrolyte (4.3) in contact with the leather specimen shall form the common electrode. The high-potential electrode shall be in electrical contact with the steel balls (4.6.2). 4.
39、6.2 Magnetic stainless steel balls, approximately 3 mm in diameter, to be maintained free of grease, oil, silicone and rust. Keep the balls clean by treating them with a suitable chemical, followed, by rinsing them with water and allowing them to air-dry. NOTE Suitable cleaning chemicals are 5 % nit
40、ric acid or acetone. 4.7 Abrasive paper, grade P180, as defined in the P-series grit-size standard published by the Federation of European Producers of Abrasive Products, cut into rectangles of 65 mm 5 mm 45 mm 5 mm, fixed to a flat, rigid base of the same size and weighted to give a total mass of 1
41、,0 kg 0,1 kg. A fresh piece of abrasive paper shall be used for each test. 4.8 Magnet, used to remove steel balls from sample. 4.9 Balance, with an accuracy of 0,01 g if water absorption required. 5 Sampling and sample preparation 5.1 Sample in accordance with ISO 2418. Use the press knife (4.2) to
42、cut two square test specimens of at least 100 mm 100 mm so that one side of each specimen is parallel to the principal direction of the material. 5.2 Mark the principal direction of the material on each test specimen. 5.3 If it is considered that the test specimens are virtually impermeable through
43、their thickness, but may be prone to wicking along their length, seal all four edges of both test specimens with the rubber solution (4.5). 5.4 Store the test specimens in a standard controlled environment according to ISO 2419 for at least 48 h. It is not necessary to carry out the test in this atm
44、osphere. 6 Pre-treatments to simulate wear If considered appropriate, samples can also be tested after light buffing with an abrasive paper using the following technique. Lightly buff the grain (or the outer surface when worn) by placing the test piece grain (or the outer surface when worn) upwards
45、on a flat surface. Place the weighted abrasive paper (4.7) on the test piece and move the abrasive paper ten times backwards and forwards along the full length of the test piece without applying any more downward force than is applied by the weighted abrasive. NOTE In some situations, it might be mo
46、re appropriate to flex a sample for 20 000 cycles using the method and apparatus specified in ISO 5402-1. Many leathers have a surface coat on the grain or on the outer surface when worn. This surface coat greatly increases the water resistance of the leather. If microcracks develop rapidly in this
47、coat as a result of flexing during wear or if the coat is damaged by abrasion, then measurements made on the leather as received can be misleading. The abrasion and flexing treatments described above are intended to simulate the abrasion which the leather would receive while being worn and the test
48、piece should therefore be abraded or flexed before the test. The purpose of this abrasion is not to remove the surface coat but merely to scratch it lightly. BS EN ISO 5403-2:2011ISO 5403-2:2011(E) IULTCS/IUP 10-2:2011(E) 4 ISO 2011 All rights reserved7 Procedure 7.1 Adjust the test machine (4.1) so
49、 that a pair of clamps (4.1.2 and 4.1.3) have their tips at maximum separation and in the same horizontal plane. 7.2 If it is considered that the test specimens are virtually impermeable through their thickness, but may be prone to wicking along their length, place a thin strip of compressible impermeable material (4.4) in each of the clamps (7.1) in the area where the test specimen will be bedded down. This will help to prevent water seeping between the test specimen and the clamps (4.1.2 a
