1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 17502:2013Leather Determination ofsurface reflectanceBS EN ISO 17502:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation ofEN ISO 17502
2、:2013.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 secretary.This publication does not purport to include all the necessaryprovisions of
3、a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013 ISBN 978 0 580 77302 0 ICS 59.140.30 Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under
4、the authority of theStandards Policy and Strategy Committee on 31 May 2013. Amendments issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 17502 May 2013 ICS 59.140.30 English Version Leather - Determination of surface reflectance (ISO 17502:2
5、013) Cuir - Dtermination du facteur de rflexion en surface (ISO 17502:2013) Leder - Bestimmung der Oberflchenreflexion (ISO 17502:2012) This European Standard was approved by CEN on 25 April 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the condition
6、s 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
7、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 standards
8、 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, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Sloveni
9、a, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for
10、CEN national Members. Ref. No. EN ISO 17502:2013: EBS EN ISO 17502:2013EN ISO 17502:2013 (E) 3 Foreword This document (EN ISO 17502:2013) has been prepared by IULTCS “International Union of Leather Technologists and Chemists Societies“ in collaboration with Technical Committee CEN/TC 289 “Leather” t
11、he 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 November 2013, and conflicting national standards shall be withdrawn at the latest by November 2013. Attenti
12、on 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 standards organizations of th
13、e 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, Lithuania, Luxembourg, Malta, Netherl
14、ands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 17502:2013 has been approved by CEN as EN ISO 17502:2013 without any modification. BS EN ISO 17502:2013ISO 17502:2013(E)IULTCS/IUF 472:2013(E) IS
15、O 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Terms and definitions . 13 Principle 14 Apparatus and materials 15 Test specimens 16 Procedure. 27 Test report . 4Annex A (informative) Precision . 5Annex B (informative) Apparatus and materials . 6BS EN ISO 17502:2013ISO 17502:2013(
16、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 which a
17、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 matter
18、s 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 by the technical committees are circulated
19、 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 rights. ISO shall not be held responsible fo
20、r identifying any or all such patent rights.ISO 17502 was prepared by the European Committee for Standardization (CEN) Technical Committee CEN/TC 289, Leather, in collaboration with the Fastness Tests Commission of the International Union of Leather Technologists and Chemists Societies (IUF Commissi
21、on, IULTCS), in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).IULTCS, originally formed in 1897, is a worldwide organization of professional leather societies to further the advancement of leather science and technology. IULTCS has three Commissions, w
22、hich 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.IULTCS/IUF 472:2013(E)iv ISO 2013 All rights reservedBS EN ISO 17502:2013INTERNATIONAL STA
23、NDARDISO 17502:2013(E)IULTCS/IUF 472:2013(E)Leather Determination of surface reflectance1 ScopeThis International Standard specifies a method for determining the reflectance properties of a leather surface for visible and near infrared radiation. The reflection value in the near infrared determines
24、if a leather may be classified as solar reflective.The method is applicable to all types of leather, in particular for coloured leather.2 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.2.1solar reflective leatherleather that reflects at least 55 % o
25、f the radiation when the diffuse reflectance of the surface is measured at 900 nm3 PrincipleThe reflective properties of leathers exposed to solar radiation, especially automotive, motorcycle and shoe leather, have an influence on the comfort of the user. Leathers with good near infrared reflective
26、characteristics have a lower temperature when exposed to direct solar radiation.The solar reflective properties of leather may be determined by measuring the diffuse reflectance with an Ulbricht integrating sphere in the near infrared wavelength range of 700 nm to 1 100 nm. If the measured % reflect
27、ion at 900 nm is 55 % or higher, then the leather is classified as solar reflective.4 Apparatus and materials4.1 Spectrophotometer, capable of measuring the diffuse reflection at 900 nm wavelength. A suitable spectrophotometer is one with an Ulbricht integrating sphere with a 90 and 8 geometry for t
28、he spectrophotometer and light ports, respectively, as well as a suitable light source and detector for determining the diffuse reflectance of the leather surface.Spectrophotometer systems with fibre-optic cables to link the light source, integrating sphere and spectrophotometer, as well as suitable
29、 software to measure the % reflection at specific wavelengths and to record the reflectance spectrum over the visible and near infrared wavelengths, 400 nm to 1 100 nm, are recommended.NOTE An example of a suitable spectrophotometer system is given in Annex B.4.2 White diffuse reflectance standard,
30、a white reference material with 98 % reflection in the wavelength range 250 nm to 1 500 nm, for calibrating the integrating sphere spectrophotometer.NOTE An example of a suitable standard is given in Annex B.5 Test specimensA dry leather specimen, measuring approximately 300 mm 200 mm. ISO 2013 All
31、rights reserved 1BS EN ISO 17502:2013ISO 17502:2013(E)6 Procedure6.1 Check that the spectrophotometer system (4.1) is set up to measure reflectance. Check that in the wavelength range 400 nm to 1 100 nm the white and black references are reading 100 % and 0 %, respectively. If necessary, re-set the
32、spectrophotometer calibration so that the references have these reflectance values.It is important for accurate reflectance measurements that the spectrophotometer calibration is checked each time it is started or if the last measurement was more than one hour before. The white reference tile (4.2)
33、is used to set the 100 % reflectance limit. The 0 % reflectance limit is set by the black reference, which is made by either completely blocking the light source at the lamp or switching the light source off.6.2 Place the test specimen on a flat surface with the surface to be tested uppermost.NOTE N
34、ormally, the surface tested is the outer surface exposed to solar radiation. For finish coated leathers with a low reflectance value, it may be useful to determine if the uncoated side also has a low reflectance. This indicates if the pigments in the coating or dyes in the leather are responsible fo
35、r the low reflectance.6.3 To measure the reflectance, place the integrating sphere flat on the surface of the leather sample. Check that the sphere opening is flat on the sample and no stray light may enter. Record the % reflectance value at 900 nm (to the nearest 1 %).6.4 Repeat the reflectance mea
36、surement (6.3) at least three times in different locations on the test specimen. Record the average % reflectance value at 900 nm in the test report (to the nearest 1 %).If the variation in % reflectance value is more than 10 %, then this should be noted on the test report.NOTE Variations in % refle
37、ctance can be caused by non-uniform application of dyes and pigments or by the use of absorbing components on the leather surface prior to the finish coat application.If required, the reflectance spectrum in the visible and near infrared wavelengths may be recorded, as shown in Figure 1 and Figure 2
38、.IULTCS/IUF 472:2013(E)2 ISO 2013 All rights reservedBS EN ISO 17502:2013ISO 17502:2013(E)KeyX Wavelength, in nmY % reflectanceFigure 1 Spectrum of a black leather with solar reflective propertiesKeyX Wavelength, in nmY % reflectanceFigure 2 Spectrum of a black leather without solar reflective prope
39、rtiesIULTCS/IUF 472:2013(E) ISO 2013 All rights reserved 3BS EN ISO 17502:2013ISO 17502:2013(E)7 Test reportThe test report shall include the following information:a) a reference to this International Standard, i.e. ISO 17502;b) a description of the type of leather and which surface has been tested;
40、c) the % reflectance value at 900 nm (to the nearest 1 %) and if the specimen tested may be classified as solar reflective;d) details of any deviations from the procedure specified;e) the date of the test.IULTCS/IUF 472:2013(E)4 ISO 2013 All rights reservedBS EN ISO 17502:2013ISO 17502:2013(E)Annex
41、A (informative) PrecisionAt the 55 % reflectance level, the measurement precision at 95 % confidence is: repeat measurements 2 in the % reflectance value; between laboratory measurements 4 in the % reflectance value.IULTCS/IUF 472:2013(E) ISO 2013 All rights reserved 5BS EN ISO 17502:2013ISO 17502:2
42、013(E)Annex B (informative) Apparatus and materialsB.1 GeneralExamples of suitable products are given below. This information is given for the convenience of users of this International Standard and does not constitute an endorsement by ISO of these products.B.2 SpectrophotometerA suitable spectroph
43、otometer system (4.1) may be obtained using the compact, “user-configured” type of equipment available from scientific suppliers of spectrophotometers. Components for a suitable system are: Ulbricht integrating sphere, diameter 30 mm, port diameter 6 mm; halogen light source for the 360 nm to 1 700
44、nm range; visible near infrared spectrophotometer for the 400 nm to 1 100 nm range; optical fibre cables (400 m core diameter), suitable for near infrared light transmission, to link the light source, integrating sphere and spectrophotometer; white reference tile; spectrophotometer operating softwar
45、e and computer.Other spectrophotometers may be used, provided that they are capable of measuring the diffuse reflection of a surface in the near infrared and in particular at 900 nm.B.3 White diffuse reflectance standardAny white diffuse reflectance standard (4.2) may be used, provided that it compl
46、ies with the specification of being more than 98 % reflective from 250 nm to 1 500 nm. Typically, the standard will be encased in a metal housing to protect the surface from damage.A suitable white diffuse reflectance standard may be obtained from scientific suppliers of spectrophotometers.IULTCS/IU
47、F 472:2013(E)6 ISO 2013 All rights reservedBS EN ISO 17502:2013This page deliberately left blankThis page deliberately left blankBSI is the independent national body responsible for preparing British Standards and other standards-related publications, information and services. It presents the UK vie
48、w on standards in Europe and at the international level. BSI is incorporated by Royal Charter. British Standards and other standardisation products are published by BSI Standards Limited.British Standards Institution (BSI)raising standards worldwideBSI389 Chiswick High Road London W4 4AL UKTel +44 (
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