EN ISO 17502:2013

Leather - Determination of surface reflectance (ISO 17502:2013)

ISO 17502:2013 specifies a method for determining the reflectance properties of a leather surface for visible and near infra-red radiation. The reflection value in the near infra-red determines if a leather may be classified as solar reflective.
The method is applicable to all types of leather, in particular for coloured leather.

Leder - Bestimmung der Oberflächenreflexion (ISO 17502:2013)

Diese Internationale Norm legt ein Verfahren zur Bestimmung der Reflektionseigenschaften einer
Lederoberfläche für Licht im sichtbaren und nahen Infrarotbereich fest. Der Reflektionsgrad im nahen
Infrarotbereich bestimmt, ob ein Leder als Sonnenlicht reflektierend eingestuft werden kann.
Das Verfahren ist für alle Ledersorten, besonders für gefärbtes Leder, anwendbar.

Cuir - Détermination du facteur de réflexion en surface (ISO 17502:2013)

L'ISO 17502:2013 spécifie une méthode permettant de caractériser les propriétés réfléchissantes d'une surface de cuir dans le visible et le proche infrarouge. Le facteur de réflexion dans le proche infrarouge détermine si un cuir peut être classé parmi les cuirs réfléchissants.
Cette méthode s'applique à tous les types de cuir, en particulier les cuirs colorés.

Usnje - Ugotavljanje odbojnosti površine (ISO 17502:2013)

Ta mednarodni standard določa metodo za ugotavljanje odbojnih lastnosti usnjene površine pri vidnem in skoraj infrardečem sevanju. Vrednost odboja pri skoraj infrardečem sevanju določa, ali
usnje lahko klasificiramo kot sončnoodbojno. Ta metoda se uporablja za vse vrste usnja, še posebej pa za barvno usnje.

General Information

• Status: Published
• Publication Date: 07-May-2013
• Withdrawal Date: 29-Nov-2013
• ICS: 59.140.30 - Leather and furs
• Technical Committee: CEN/TC 289 - Leather
• Drafting Committee: CEN/TC 289/WG 3 - Fastness test methods
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 08-May-2013
• Due Date: 08-May-2014
• Completion Date: 08-May-2013
• Ref Project: SIST EN ISO 17502:2013 - Leather - Determination of surface reflectance (ISO 17502:2013)

Overview - EN ISO 17502:2013 (Leather - Determination of surface reflectance)

EN ISO 17502:2013 defines a standardized test method to measure the diffuse surface reflectance of leather across visible and near‑infrared wavelengths. The method identifies if a leather can be classified as solar reflective by measuring reflectance at 900 nm. It applies to all leather types, with particular relevance for coloured and finished leathers.

Key topics and technical requirements

• Scope and purpose: Measure reflectance properties (400–1 100 nm) to assess solar‑reflective behaviour and user comfort under solar exposure.
• Solar‑reflective criterion: Leather is classified as solar reflective when diffuse reflectance at 900 nm ≥ 55%.
• Apparatus:
  • Spectrophotometer with an Ulbricht integrating sphere (suitable geometry specified) and appropriate light source/detector for visible to near‑IR.
  • White diffuse reflectance standard (>98% reflectance from 250 nm to 1 500 nm) for calibration.
  • Optional fibre‑optic links and software to record spectra (400–1 100 nm).
• Specimen: Dry leather sample approximately 300 mm × 200 mm.
• Procedure:
  • Calibrate instrument so white = 100% and black = 0% across 400–1 100 nm.
  • Measure diffuse reflectance with the integrating sphere placed flat on the tested surface; record % reflectance at 900 nm (nearest 1%).
  • Take at least three measurements at different locations and report the average; note if variation >10%.
• Precision (informative): At the 55% level, repeatability ≈ ±2% (single lab) and reproducibility between labs ≈ ±4% (95% confidence).
• Test report must include: reference to ISO 17502, leather type and surface tested, % reflectance at 900 nm and solar‑reflective classification, deviations, and test date.

Practical applications

• Product development and R&D: evaluate coatings, dyes, and treatments that affect near‑IR reflectance.
• Quality control and supplier verification: ensure consistency for automotive, motorcycle, upholstery and footwear leathers where surface temperature and comfort matter.
• Marketing and compliance: substantiate claims for “solar reflective” leather by standardized measurement.
• Research on thermal comfort and material selection for outdoor or vehicle interiors.

Who should use this standard

• Leather manufacturers and finishers
• Material testing laboratories and certification bodies
• Automotive and footwear specifiers, designers, and R&D teams
• Procurement and quality assurance professionals verifying supplier claims

Related standards

EN ISO 17502 should be used alongside other leather test methods and spectrophotometry best practices when specifying optical or thermal performance. For procurement and compliance, reference this standard when requiring validated solar‑reflective performance.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2013
Usnje - Ugotavljanje odbojnosti površine (ISO 17502:2013)
Leather - Determination of surface reflectance (ISO 17502:2013)
Leder - Bestimmung der Oberflächenreflektion (ISO 17502:2013)
Cuir - Détermination de la réflectance de surface (ISO 17502:2013)
Ta slovenski standard je istoveten z: EN ISO 17502:2013
ICS:
59.140.30 Usnje in krzno Leather and furs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 17502
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2013
ICS 59.140.30
English Version
Leather - Determination of surface reflectance (ISO 17502:2013)
Cuir - Détermination du facteur de réflexion en surface (ISO Leder - Bestimmung der Oberflächenreflexion (ISO
17502:2013) 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 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 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 Management 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, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17502:2013: E
worldwide for CEN national Members.

Contents Page
Foreword .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” 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 national 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 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,
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 17502:2013 has been approved by CEN as EN ISO 17502:2013 without any modification.

INTERNATIONAL ISO
STANDARD 17502
IULTCS/IUF
First edition
2013-05-01
Leather — Determination of surface
reflectance
Cuir — Détermination du facteur de réflexion en surface
Reference numbers
ISO 17502:2013(E)
IULTCS/IUF 472:2013(E)
©
ISO 2013
ISO 17502:2013(E)
IULTCS/IUF 472:2013(E)
© ISO 2013
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
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Published in Switzerland
ii © ISO 2013 – All rights reserved

ISO 17502:2013(E)
IULTCS/IUF 472:2013(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Terms and definitions . 1
3 Principle . 1
4 Apparatus and materials. 1
5 Test specimens. 1
6 Procedure. 2
7 Test report . 4
Annex A (informative) Precision . 5
Annex B (informative) Apparatus and materials . 6
ISO 17502:2013(E)
IULTCS/IUF 472:2013(E)
Foreword
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