1、BS EN ISO 17233:2017Leather Physical andmechanical tests Determination of cold cracktemperature of surfacecoatings (ISO 17233:2017)BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN ISO 17233:2017 BRITISH STANDARDNational forewordThis British Standard is the UK im
2、plementation of EN ISO 17233:2017. It supersedes BS EN ISO 17233:2002 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee TCI/69, Footwear, leather and coated fabrics.A list of organizations represented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 s
3、ecretary.This publication does 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 86628 9 ICS 59.140.30 Compliance with a British Standard
4、cannot confer immunity from 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 Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 17233 Febr
5、uary 2017 ICS 59.140.30 English Version Leather - Physical and mechanical tests - Determination of cold crack temperature of surface coatings (ISO 17233:2017) Cuir - Essais physiques et mcaniques - Dtermination de la temprature de fissuration froid des revtements de surface (ISO 17233:2017) Leder -
6、Physikalische und mechanische Prfungen - Bestimmung der Kltebruchtemperatur von Oberflchendeckschichten (ISO 17233:2017) This European Standard was approved by CEN on 5 January 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving t
7、his 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 three official
8、 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 standards bodies of Aus
9、tria, 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, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spa
10、in, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION 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 worldwid
11、e for CEN national Members. Ref. No. EN ISO 17233:2017 EBS EN ISO 17233:2017EN ISO 17233:2017 (E) 3 European foreword This document (EN ISO 17233:2017) has been prepared by Technical Committee IULTCS “International Union of Leather Technologists and Chemists Societies“ in collaboration with Technica
12、l Committee CEN/TC 289 “Leather” the secretariat of which is held by UNI. 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 August 2017, and conflicting national standards shall be withdrawn at the
13、latest by August 2017. 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 Regulations, the national
14、 standards organizations of the following 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, Lithuan
15、ia, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 17233:2017 has been approved by CEN as EN ISO 17233:2017 without any modification. BS EN ISO 17233:2017ISO
16、17233:2017(E)IULTCS/IUP 29:2017(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 15 Apparatus and materials 16 Sampling and sample preparation 27 Procedure. 38 Test report . 4Annex A (informative) Example for fixing test pieces with adhesive tape 5 ISO 2017 All
17、rights reserved iiiContents PageBS EN ISO 17233:2017ISO 17233:2017(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 technica
18、l 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 collaborates closely wit
19、h 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 criteria needed f
20、or 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 (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 ri
21、ghts. 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 in
22、 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 World Trade Organization (WTO) principl
23、es in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.ISO 17233 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 Committ
24、ee for Standardization (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).It is based on IUP 29 originally published in J. Soc. Leather Tech. Chem., 69, p. 85, (1985)
25、 and declared an official method of the IULTCS in 1987. This updated version was published in J. Soc. Leather Tech. Chem., 84, p. 369, (2000) and reconfirmed as an official method in March 2001. The same principle is used but the text has been updated and includes the number of test pieces to be tak
26、en.IULTCS, originally formed in 1897, is a world-wide organization of professional leather societies to further the advancement of leather science and technology. IULTCS has three Commissions, which are responsible for establishing international methods for the sampling and testing of leather. ISO r
27、ecognizes IULTCS as an international standardizing body for the preparation of test methods for leather.This second edition cancels and replaces the first edition (ISO 17233:2002), which has been technically revised with the following changes: the cooled chamber (5.1) and the hinged sample holder (5
28、.3) have been specified more precisely; the number of test pieces has been changed to six for each temperature tested and a number of associated changes has been made; in addition to the fixing of samples with screws, it is now also possible to fix the samples with adhesive tape.IULTCS/IUP 29:2017(E
29、)iv ISO 2017 All rights reservedBS EN ISO 17233:2017INTERNATIONAL STANDARDISO 17233:2017(E)IULTCS/IUP 29:2017(E)Leather Physical and mechanical tests Determination of cold crack temperature of surface coatings1 ScopeThis document specifies a method for determining the cold crack temperature of surfa
30、ce coatings applied to leather. It is applicable to all leathers which have a surface coating and which can be easily flexed.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
31、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 locationISO 2419, Leather Physical and mechanical tests Sample preparat
32、ion and conditioningEN 15987, Leather Terminology Key definitions for the leather trade3 Terms and definitionsFor the purposes of this document, the terms and definitions given in EN 15987 apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC
33、Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp4 PrincipleA strip of leather is held in a hinged apparatus in a cooled chamber at a given temperature. The hinged apparatus is closed rapidly causing the leather to
34、be folded with the surface coating outwards. The leather is examined to determine if the surface coating has cracked.5 Apparatus and materials5.1 Cooled chamber, minimum internal height 500 mm and minimum internal width and depth 300 mm, fitted with a rack or other support and capable of maintaining
35、 temperatures between +5 C and 30 C and of controlling the temperature to 2 C at any temperature within the range. The design of the chamber shall allow free circulation of air around the test piece and holder.The cooled chamber should have the door on the top. If a cooled chamber with the door on t
36、he front is used, the chamber or sample holder (5.3) shall incorporate a mechanism to enable the sample holder (5.3) to be snapped shut without opening the front door.5.2 Temperature measuring device, readable to 1 C and operating between at least +5 C and 30 C. ISO 2017 All rights reserved 1BS EN I
37、SO 17233:2017ISO 17233:2017(E)5.3 Hinged sample holder, of the type and dimensions shown in Figure 1 and capable of holding at least six test pieces without them touching each other. All fixings on the inside shall be flush with the inner surface so as not to present any obstruction when the sample
38、holder is closed.Sample holder for fixing the test pieces with an adhesive tape shall have suitable marks (auxiliary lines) for positioning the test pieces (see Figure 1 and Annex A).Dimensions in millimetresKey1 hinge2 securing nut3 countersunk bolt4 line parallel to the hinge for positioning of te
39、st pieces (for method with adhesive tape only)5 auxiliary line for positioning of test pieces (for method with adhesive tape only)Figure 1 Hinged sample holder shown prior to snapping shut5.4 Press knife, conforming to ISO 2419, capable of punching a rectangular test piece (90 1) mm (10 1) mm.5.5 Ma
40、gnifier, with a magnification of 4 to 6 times.5.6 Adhesive tape, suitable to fix leather down to 30 C.6 Sampling and sample preparation6.1 Sample in accordance with ISO 2418.6.2 Cut test pieces by applying the press knife (5.4) to the coated surface. For each temperature to be tested, cut six test p
41、ieces from each sample, three with the long edge of the press knife parallel to, and IULTCS/IUP 29:2017(E)2 ISO 2017 All rights reservedBS EN ISO 17233:2017ISO 17233:2017(E)three perpendicular to, the backbone. If the direction of the backbone is not known, then cut the two sets of three samples at
42、right angles to each other.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 needs to be taken from each hide or skin, provided that the overall total is not less than three test pieces in each direction.6.3 Cut a circula
43、r hole of diameter (5,0 0,5) mm, with the centre of the hole (6,0 0,5) mm from each end of the test piece (see 6.2).NOTE It is not necessary to cut holes in the test pieces if test pieces are fixed with an adhesive tape.7 Procedure7.1 Insert the six test pieces from the sample into the hinged sample
44、 holder (5.3) with the surface coating facing towards the open end of the sample holder. Test pieces from two different samples should not be tested together in the same hinged sample holder unless they are of similar thickness as thin test pieces will not be adequately flexed if tested with substan
45、tially thicker test pieces.NOTE An example for fixing the test pieces with an adhesive tape is described in Annex A.7.2 Adjust the temperature of the cooled chamber to (5 2) C and then maintain this temperature for at least 30 min.NOTE Some industry specifications require testing only at one specifi
46、c temperature (see 7.7), in which case, the cooled chamber is adjusted to the specified temperature.7.3 Place the hinged sample holder (5.3) in the orientation shown in Figure 1, with the hinge at the top and the two plates splayed wide to straighten the test pieces without putting them under tensio
47、n or causing the adhesive tape, if used, to peel away from either plate, in the cooled chamber (5.1). Close the cooled chamber and leave for at least 60 min.7.4 Open the cooled chamber and, while still in the chamber, immediately snap shut the hinged sample holder as rapidly as possible, applying a
48、firm pressure. If a cooled chamber with a door on the front is used, do not open the door but activate the appropriate mechanism to snap the hinged sample holder shut while keeping the door closed.7.5 Remove the sample holder from the cooled chamber and allow to return to room temperature. Examine t
49、he flexed arc of the test piece for the presence of cracks using the magnifier (5.5).NOTE The cracks are normally linear but with thin surface coatings follow the underlying grain pattern of the leather.7.6 If the surface coating of five or six test pieces is undamaged, replace the test pieces with a set of six fresh test pieces. Repeat 7.2 to 7.5 at a temperature of (0 2) C.7.7 If the surface coating of five or six test pieces remains undamaged, repeat 7.2 to 7.6 at temperatures of (5 2) C, (10
