1、BSI Standards PublicationBS EN ISO 3379:2015Leather Determination of distension and strength of surface (Ball burst method)BS EN ISO 3379:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 3379:2015. The UK participation in its preparation was entrusted to
2、 TechnicalCommittee 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 does not purport to include all the necessary provisions of a contract. Users are responsible for its correct applicatio
3、n. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 83032 7 ICS 59.140.30 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committe
4、e on 30 September 2015.Amendments/corrigenda issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORMEN ISO 3379 September 2015 ICS 59.140.30 English Version Leather - Determination of distension and strength of surface (Ball burst method) (ISO 3379:2015) Cuir - Dt
5、ermination de lextension et de la rsistance la traction de la surface (mthode de la bille) (ISO 3379:2015) Leder - Bestimmung der Narbendehnfhigkeit und -bruchkraft (Lastometer-Methode) (ISO 3379:2015) This European Standard was approved by CEN on 8 August 2015. CEN members are bound to comply with
6、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 standards may be obtained on application to the CEN-CENELEC Managem
7、ent 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 and notified to the CEN-CENELEC Management Centre has the same statu
8、s as the official versions. CEN members are the national standards bodies of 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,
9、 Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN Al
10、l rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 3379:2015 EBS EN ISO 3379:2015EN ISO 3379:2015 (E) 3 European foreword This document (EN ISO 3379:2015) has been prepared by Technical Committee CEN/TC 289 “Leather”,the secretariat of
11、which is held by UNI, in collaboration with Technical Committee IULTCS“International Union of Leather Technologists and Chemists Societies”. This European Standard shall be given the status of a national standard, either by publication of anidentical text or by endorsement, at the latest by March 20
12、16, and conflicting national standards shallbe withdrawn at the latest by March 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject ofpatent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patentrights. Ac
13、cording to the CEN-CENELEC Internal Regulations, the national standards organizations of thefollowing 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,
14、 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 3379:2015 has been approved by CEN as EN ISO 3379:2015 with
15、out any modification. BS EN ISO 3379:2015ISO 3379:2015(E)IULTCS/IUP 9:2015(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 15 Apparatus and material 26 Sampling and sample preparation 37 Procedure. 38 Test report . 4Annex A (informative) Sources of apparatus .
16、5 ISO 2015 All rights reserved iiiContents PageBS EN ISO 3379:2015ISO 3379:2015(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
17、 ISO technical committees. Each member 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 collaborate
18、s closely with the International Electrotechnical Commission (IEC) on all matters 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 crit
19、eria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of pat
20、ent rights. ISO shall not be held responsible for identifying any or 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
21、 in this document is information given for the convenience of users 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 WTO principles in the Technical Barr
22、iers to Trade (TBT) see the following URL: Foreword - Supplementary information.ISO 3379 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 (
23、CEN) Technical Committee CEN/TC 289, Leather, 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 adv
24、ancement of leather science 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.This second edi
25、tion cancels and replaces the first edition (ISO 3379:1976), which has been technically revised.IULTCS/IUP 9:2015(E)iv ISO 2015 All rights reservedBS EN ISO 3379:2015INTERNATIONAL STANDARDISO 3379:2015(E)IULTCS/IUP 9:2015(E)Leather Determination of distension and strength of surface (Ball burst meth
26、od)1 ScopeThis International Standard specifies a test method for the determination of distension and strength of the leather grain or finished surface. This method is applicable to all flexible leathers and it is particularly suitable to determine the lastability of leathers for footwear uppers.2 N
27、ormative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendment
28、s) applies.ISO 2418, Leather Chemical, physical and mechanical and fastness tests Sampling locationISO 2419, Leather Physical and mechanical tests Sample preparation and conditioningISO 2589, Leather Physical and mechanical tests Determination of thickness3 Terms and definitionsFor the purposes of t
29、his document, the following terms and definitions apply.3.1wearing surfaceexposed or visible face of the leather when used in its intended applicationNote 1 to entry: The wearing surface is usually the grain side of leather, however, the wearing surface of some leathers may be otherwise dressed or f
30、inished, e.g. patent leather.3.2reverse sideopposite side to the wearing surfaceNote 1 to entry: The reverse side is usually the flesh side of leather.3.3crackingsmall surface splits or tears less than approximately 0,5 mm3.4burstingcomplete rupture of the full thickness of the test piece4 Principle
31、A circular test piece is clamped around its edge and is gradually distended by forcing a steel metal ball, attached to the end of a plunger, against the centre of the test piece on the reverse side. At certain distension, measured in terms of distance travelled by the plunger, cracks appear on the w
32、earing surface of the test piece or it sustains other permanent physical damage; this distension is recorded as the cracking point or first damage. At a higher distension, the material usually bursts and this distension may also be recorded. ISO 2015 All rights reserved 1BS EN ISO 3379:2015ISO 3379:
33、2015(E)5 Apparatus and material5.1 Test machine, incorporating the following (see Figure 1).5.1.1 Clamp, for holding securely the test piece around its edge, leaving a central circular aperture of diameter 25,0 mm 0,5 mm. The design of the clamping system of the machine shall ensure that the test pi
34、ece does not slip during the test and shall neither stretch nor compress the central area of the test piece as it is clamped.NOTE To ensure that the test piece does not slip in the clamp during the test, it might be necessary to add some interlocking profile, serrations, or other mechanical interven
35、tion to the face of the top and bottom clamps.5.1.2 Moveable plunger, with a hemispherical end, nominal diameter 6,25 mm 0,05 mm.5.1.3 Means of moving the plunger, without rotation, against the centre of the test piece and in a direction normal to the plane occupied by the test piece when it is clam
36、ped, at a speed of 0,20 mm/s 0,05 mm/s.5.1.4 Means of monitoring and recording distension of the leather, or travel of the plunger from zero, in a direction normal to the plane occupied by the test piece with an accuracy of 0,05 mm.5.1.5 Means of monitoring and recording the force on the plunger wit
37、h an accuracy of 10 N.Key1 top clamp2 bottom clamp3 plunger with hemispherical endA aperture diameter (25,0 mm)Figure 1 Clamp and plunger5.2 Press knife, as specified in ISO 2419, capable of cutting a circular test piece in one operation with suitable dimensions to be firmly clamped in the test mach
38、ine.5.3 Thickness gauge, as specified in ISO 2589.IULTCS/IUP 9:2015(E)2 ISO 2015 All rights reservedBS EN ISO 3379:2015ISO 3379:2015(E)6 Sampling and sample preparation6.1 Condition the leather sample in accordance with ISO 2419.6.2 Sample in accordance with ISO 2418. Using the press knife (5.2), cu
39、t at least three test pieces in accordance with ISO 2419.NOTE If there is a requirement for more than two hides or skins to be tested in one batch, then only one test piece needs to be taken from each hide or skin, provided that the overall total is not less than three test pieces.6.3 Measure the th
40、ickness of the test pieces in accordance with ISO 2589.7 Procedure7.1 Ensure that the test machine is set with the central plunger retracted to zero or minimum distension. If it has a maximum force indicator, set it to zero.NOTE “Zero” distension is set by placing a circular, rigid, and flat materia
41、l in the apparatus in place of the test piece.7.2 Clamp the conditioned test piece into the test machine so that the ball-ended plunger acts on the reverse side of the test piece and the test piece is flat.7.3 Increase the distension at a rate of 0,20 mm/s 0,05 mm/s and watch the grain or finished s
42、urface for the occurrence of a crack or first damage on the surface.7.4 When a crack or first damage occurs, record the distension in millimetre to the nearest 0,1 mm and the force in newton to the nearest 10 N. If burst is required, continue the distension with the minimum of delay.Patent leather i
43、s a special case because often, the grain of the leather cracks before the patent surface film. Particular care is therefore required when observing patent leather test pieces. Two indications of the grain cracking are a small shallow depression in the surface of the film above the crack and a momen
44、tary drop in the force on the plunger. If the patent film cracks, this shall also be regarded as a “grain crack” whether or not a crack in the grain is visible.NOTE For some leathers, it is possible to determine grain or finish cracking of the wearing surface by analysing the force-displacement curv
45、e. When cracking occurs, there is a sudden decrease in the load, to be considered only as a confirmation of the visual assessment.7.5 If the test piece does not crack before bursting, report the values of distension and load at burst.If the test piece does not burst when the maximum force or distens
46、ion is reached, record the displacement and report the result as “more than maximum distension” or “more than maximum load” (e.g. 15 mm or 800 N).NOTE If there is a pause during the distension of a test piece, relaxation of stresses in it occurs and the force reading tends to fall. Therefore, the te
47、st is ideally continuous with no delays, but, if necessary, any delay during distension between cracking and burst is less than 15 s.7.6 Retract the plunger, remove the test specimen, and inspect the marks left by the clamps on the wearing surface of the specimen. If there are signs of slippage havi
48、ng occurred during the test, for example, evident by blurring of clamping rings or of tearing of the clamped edges, reject the results and repeat the procedure 7.1 to 7.6 with a new specimen.7.7 Repeat 7.1 to 7.6 for other test pieces.IULTCS/IUP 9:2015(E) ISO 2015 All rights reserved 3BS EN ISO 3379
49、:2015ISO 3379:2015(E)8 Test reportThe test report shall include the following:a) reference to this International Standard, i.e. ISO 3379;b) full details for identification of the sample, including any specific reference if known, and the thickness of the leather in millimetre (mm);c) mean distension at crack in millimetre (mm) to the nearest 0,1 mm; if the test piece does not crack before bursting, report the values of distension at burst;d) mean force at crack in newton (N) to the nearest 10 N; if the test piece does not crack be
