1、August 2013 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
2、59.140.30!%(3“2052916www.din.deDDIN EN ISO 17502Leather Determination of surface reflectance (ISO 17502:2013);English version EN ISO 17502:2013,English translation of DIN EN ISO 17502:2013-08Leder Bestimmung der Oberflchenreflektion (ISO 17502:2013);Englische Fassung EN ISO 17502:2013,Englische bers
3、etzung von DIN EN ISO 17502:2013-08Cuir Dtermination du facteur de rflexion en surface (ISO 17502:2013);Version anglaise EN ISO 17502:2013,Traduction anglaise de DIN EN ISO 17502:2013-08www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritati
4、ve.1108.13 DIN EN ISO 17502:2013-08 2 A comma is used as the decimal marker. National foreword This document (EN ISO 17502:2013) has been prepared by Technical Committee CEN/TC 289 “Leather” (Secretariat: UNI, Italy) in collaboration with the International Union of Leather Technologists and Chemists
5、 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 physi-kalische Prfverfahren fr Leder und seine Ausgangsprodukte. EUROPEAN STANDARD NORME EU
6、ROPENNE EUROPISCHE NORM EN ISO 17502 May 2013 ICS 59.140.30 English Version Leather - Determination of surface reflectance (ISO 17502:2013) Cuir - Dtermination du facteur de rflexion en surface Leder - Bestimmung der OberflchenreflexionThis European Standard was approved by CEN on 25 April 2013. CEN
7、 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 without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on appl
8、ication 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 other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Ma
9、nagement Centre has the same status 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, Lat
10、via, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, 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-10
11、00 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 17502:2013: E(ISO 17502:2013) (ISO 17502:2012) Contents DIN EN ISO 17502:2013-08 EN ISO 17502:2013 (E) Page Foreword 3 1 Scope 4 2 Terms and definitions .4 3 Prin
12、ciple 4 4 Apparatus and materials .4 5 Test specimens 4 6 Procedure .5 7 Test report 7 Annex A (informative) Precision 8 Annex B (informative) Apparatus and materials 9 2 Foreword This document (EN ISO 17502:2013) has been prepared by IULTCS “International Union of Leather Technologists and Chemists
13、 Societies in collaboration with Technical 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 November 2013, and conflicting n
14、ational standards shall be withdrawn at the latest by November 2013. 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
15、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 Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hun
16、gary, 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 17502:2013 has been approved by CEN as EN ISO 17502:2013 without any
17、modification. DIN EN ISO 17502:2013-08 EN ISO 17502:2013 (E) 3 1 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 if a leather may be class
18、ified 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 % of the radiation when the
19、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 characteristics have a lo
20、wer 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 % reflection at 900 nm is 55 % or
21、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 the spectrophotometer and
22、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 software to measure the
23、% 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, a white reference materia
24、l 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.DIN EN ISO 17502:2013-08 EN ISO 17502:2
25、013 (E) 4 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 spectrophotometer calibration so that the re
26、ferences 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) is used to set the 100 % reflectance limit.
27、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 Normally, the surface tested is the outer sur
28、face 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 for the low reflectance.6.3 To measure the ref
29、lectance, 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 measurement (6.3) at least three times in diffe
30、rent 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 % reflectance can be caused by non-uniform applicat
31、ion 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.DIN EN ISO 17502:2013-08 EN ISO 17502:2013
32、(E) 5 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 propertiesDIN EN ISO 17502:2013-08 EN ISO 17502:2013 (E) 6 7 Test reportThe test report s
33、hall 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;c) the % reflectance value at 900 nm (to the nearest 1 %) and if the specimen tested may be classified as solar reflective;d)
34、 details of any deviations from the procedure specified;e) the date of the test.DIN EN ISO 17502:2013-08 EN ISO 17502:2013 (E) 7 Annex A (informative) PrecisionAt the 55 % reflectance level, the measurement precision at 95 % confidence is: repeat measurements 2 in the % reflectance value; between la
35、boratory measurements 4 in the % reflectance value.DIN EN ISO 17502:2013-08 EN ISO 17502:2013 (E) 8 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 no
36、t constitute an endorsement by ISO of these products.B.2 SpectrophotometerA suitable spectrophotometer 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 integra
37、ting sphere, diameter 30 mm, port diameter 6 mm; halogen light source for the 360 nm to 1 700 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, integ
38、rating sphere and spectrophotometer; white reference tile; spectrophotometer operating software 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 reflec
39、tance standardAny white diffuse reflectance standard (4.2) may be used, provided that it complies 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.DIN EN ISO 17502:2013-08 EN ISO 17502:2013 (E) 9
