DIN EN ISO 5403-2-2012 Leather - Determination of water resistance of flexible leather - Part 2 Repeated angular compression (Maeser) (ISO 5403-2 2011) German version EN ISO 5403-2.pdf

1、March 2012 Translation by DIN-Sprachendienst.English price group 8No part of this translation 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 5

2、9.140.30!$zk“1875872www.din.deDDIN EN ISO 5403-2Leather Determination of water resistance of flexible leather Part 2: Repeated angular compression (Maeser) (ISO 5403-2:2011)English translation of DIN EN ISO 5403-2:2012-03Leder Bestimmung der Wasserbestndigkeit von flexiblem Leder Teil 2: Winkelbiege

3、verfahren (Maeser) (ISO 5403-2:2011)Englische bersetzung von DIN EN ISO 5403-2:2012-03Cuir Dtermination de limpermabilit leau des cuirs souples Partie 2: Compression angulaire rpte (Maeser) (ISO 5403-2:2011)Traduction anglaise de DIN EN ISO 5403-2:2012-03www.beuth.deIn case of doubt, the German-lang

4、uage original shall be considered authoritative.Document comprises 11 pages 02.12 DIN EN ISO 5403-2:2012-03 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee CEN/TC 289 “Leather” (Secretariat: UNI, Italy) in collaboration with the Inter

5、national Union of Leather Technologists and Chemists Societies (IULTCS). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Working Committee NA 062-05-51 AA Anforderungen und physikalische Prfverfahren fr Leder und

6、 seine Ausgangsprodukte. DIN EN ISO 5403 consists of the following parts, under the general title Leather Determination of water resistance of flexible leather: Part 1: Repeated linear compression (penetrometer) Part 2: Repeated angular compression (Maeser) The DIN Standards corresponding to the Int

7、ernational Standards referred to in this document are as follows: ISO 2418 DIN EN ISO 2418 ISO 2419 DIN EN ISO 2419 ISO 3696:1987 DIN ISO 3696:1991-06 ISO 5403-2 DIN EN ISO 5403-2 National Annex NA (informative) Bibliography DIN EN ISO 2418, Leather Chemical, physical and mechanical and fastness tes

8、ts Sampling location DIN EN ISO 2419, Leather Physical and mechanical tests Sample preparation and conditioning DIN EN ISO 5403-1, Leather Determination of water resistance of flexible leather Part 1: Repeated linear compression (penetrometer) DIN ISO 3696:1991-06, Water for analytical laboratory us

9、e Specification and test methods EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 5403-2 December 2011 ICS 59.140.30; 61.060 English Version Leather - Determination of water resistance of flexible leather - Cuir - Dtermination de limpermabilit leau des cuirs souples - Partie 2: Compression a

10、ngulaire rpte (Maeser) (ISO 5403-2:2011) Leder - Bestimmung der Wasserbestndigkeit von flexiblem Leder - Teil 2: Winkelbiegeverfahren 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 conditio

11、ns 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 on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in

12、 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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standard

13、s bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, 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 Unit

14、ed Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION 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 5403-2:2

15、011: E(ISO 5403-2:2011) Part 2: Repeated angular compression (Maeser) (ISO 5403-2:2011) Contents EN ISO 5403-2:2011 (E) DIN EN ISO 5403-2:2012-03 2 Page Foreword 3 1 Scope 4 2 Normative references 4 3 Principle 4 4 Apparatus, reagents and materials 4 5 Sampling and sample preparation .6 6 Pre-treatm

16、ents to simulate wear 6 7 Procedure .7 8 Calculation and expression of results .8 8.1 Water absorption .8 8.2 Water penetration 8 9 Test report 8 Bibliography 9 Foreword This document (EN ISO 5403-2:2011) has been prepared by Technical Committee CEN/TC 289 “Leather”, the secretariat of which is held

17、 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, either by publication of an identical text or by endorsement, at the latest by June 2012, and conflicting national standard

18、s 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 CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal

19、 Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembour

20、g, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom EN ISO 5403-2:2011 (E) DIN EN ISO 5403-2:2012-03 3 1 Scope This part of ISO 5403 specifies a method for determining the dynamic water resistance of leather by means of repe

21、ated angular compression. It is applicable to all 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

22、 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 2418, Leather Chemical, physical and mechanical and fastness tests Sampling location ISO 2419, Le

23、ather Physical and mechanical tests Sample preparation 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

24、immersed in water and the clamp at one end oscillates 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

25、test method of ISO 5403-1 for water resistance imparts 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 i

26、s required and, in particular, the following. 4.1 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.

27、1.1 An outer part comprising a “V” form with an internal 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. EN ISO 5403-2:2011 (E) DIN EN ISO 5403-2:2012-03 4 4.1.1.2 An inner part having the shape and size that shall complement the out

28、er part. 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 cl

29、amp at 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

30、 of applying 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 fix

31、ed quantity 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 s

32、o that 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 (

33、20 5) C. 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). EN ISO 5403-2:2011 (E) DIN EN ISO 540

34、3-2:2012-03 5 4.5 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 shall stop the test when water penetrat

35、ion 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). 4.6.2 Magnetic stainless steel balls,

36、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 % nitric acid or acetone. 4.7 Abrasive pa

37、per, 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 1,0 kg 0,1 kg. A fresh piece of abras

38、ive 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 cut two square test specimens of at

39、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 their thickness, but may be prone to

40、 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 atmosphere. 6 Pre-treatments to simulat

41、e 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 on a flat surface. Place the weighte

42、d 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 more appropriate to flex a sample for

43、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 coat as a result of flexing during w

44、ear 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 piece should therefore be abraded or

45、 flexed before the test. The purpose of this abrasion is not to remove the surface coat but merely to scratch it lightly. EN ISO 5403-2:2011 (E) DIN EN ISO 5403-2:2012-03 6 7 Procedure 7.1 Adjust the test machine (4.1) so that a pair of clamps (4.1.2 and 4.1.3) have their tips at maximum separation

46、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 sp

47、ecimen will be bedded down. This will help to prevent water seeping between the test specimen and the clamps (4.1.2 and 4.1.3) during the test. 7.3 Weigh the test specimens if water absorption is required. 7.4 Fold, without creasing, one test specimen in half so that the outer surface is facing outw

48、ards and the fold is parallel to the principal direction of the material. 7.5 Place the folded test specimen (7.4) between the pair of clamps (7.1) so that the fold runs between the tips of the Vs. 7.6 Fully tighten one of clamps, ensure that the test specimen is not slack, and then fully tighten the other clamp. 7.7 Slowly move the clamps together and watch the specimen to ensure that the centre section folds upwards. If this is not the case, gently apply pres