1、BSI Standards PublicationBS ISO 5431:2013Leather Wet blue goat skins SpecificationBS ISO 5431:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 5431:2013. Itsupersedes BS ISO 5431:1999 which is withdrawn.The UK participation in its preparation was entrusted
2、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 a contract. Users are responsible for its correctapplication
3、. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 80572 1ICS 59.140.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on
4、31 August 2013.Amendments issued since publicationDate Text affectedBS ISO 5431:2013 ISO 2013Leather Wet blue goat skins SpecificationCuir Peaux de caprins ltat “bleu humide” SpcificationsINTERNATIONAL STANDARDISO5431Second edition2013-08-01Reference numberISO 5431:2013(E)BS ISO 5431:2013ISO 5431:20
5、13(E)ii ISO 2013 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2013All 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 a
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7、lished in SwitzerlandBS ISO 5431:2013ISO 5431:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Requirements 14.1 Raw material . 14.2 Tanning 14.3 Fungicidal additives 24.4 Presentation 24.5 Shrinkage temperature 24.6 Chem
8、ical requirements 25 Sampling 25.1 Sampling for routine testing 25.2 Sampling in case of dispute 25.3 Preparation of samples 36 Method of test 36.1 Visual tests 36.2 Shrinkage temperature 36.3 Volatile matter . 36.4 pH of the water extract 36.5 Effectiveness of the fungicide . 37 Packaging and Marki
9、ng . 37.1 Packaging . 37.2 Marking . 3BS ISO 5431:2013ISO 5431:2013(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 technic
10、al 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 wi
11、th 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
12、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/directivesAttention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IS
13、O 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. www.iso.org/patentsAny trade name used in this document is
14、 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 Barriers to Trade (TBT),
15、 see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 120, Leather, Subcommittee SC 2, Tanned leather.This second edition cancels and replaces the first edition (ISO 5431:1999), which has been technically revised.iv ISO 2013 All rights rese
16、rvedBS ISO 5431:2013INTERNATIONAL STANDARD ISO 5431:2013(E)Leather Wet blue goat skins Specification1 ScopeThis International Standard specifies requirements, methods of sampling and methods of test for wet blue leather produced from goat skins tanned without hair and with the use of basic chromium
17、sulfate as the primary tanning agent.2 Normative 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 refe
18、renced document (including any amendments) applies.ISO 2418, Leather Chemical, physical and mechanical and fastness tests Sampling locationISO 3380, Leather Physical and mechanical tests Determination of shrinkage temperature up to 100 CISO 4045, Leather Chemical tests Determination of pHISO 4684, L
19、eather Chemical tests Determination of volatile matterISO 5398-1, Leather Chemical determination of chromic oxide content Part 1: Quantification by titrationASTM D4576, Standard test method for mold growth resistance of wet blue3 Terms and definitionsFor the purposes of this document, the following
20、terms and definitions apply.3.1curedpreserved temporarily from putrefaction until it can be tannedNote 1 to entry: Any method of curing, including wet or dry salting or drying, is included3.2pigmentationcolouration produced by fungi growing on wet blue chrome leatherNote 1 to entry: The colouration
21、produced by fungi will normally be black, white, green or yellow but can also be pink or violet.4 Requirements4.1 Raw materialWet blue goat skins shall be processed from cured or fresh goat skins.4.2 TanningAfter pretanning operations, the skins shall be tanned with basic chromium sulfate as the pri
22、mary tanning agent. The cut cross-section shall be such that the skin is completely penetrated by the bluish colour of the chromium sulfate when examined visually. Tanning shall be carried out at a pH of 3,0 or above. ISO 2013 All rights reserved 1BS ISO 5431:2013ISO 5431:2013(E)4.3 Fungicidal addit
23、ivesFungicides shall be used to inhibit mould growths in the wet blue goat skins.NOTE 1 Fungicides used to inhibit mould growth and pigmentation in wet blue goat skins should be effective and should not cause a health hazard. The types of fungicide used and their dosage should preferably be agreed b
24、etween the purchaser and the supplierNOTE 2 Fungicides should preferably be applied in quantities appropriate to ensure storage for up to 4 months at the temperature and humidity prevailing during storage or transportation.4.4 PresentationWet blue goat skins shall be well fleshed, and the grain side
25、 shall be free from hair, including short hair and fine hair. The size and grading shall be as agreed between the interested parties.NOTE The skins should preferably have a tight grain and be free from creases, drum folds and stains caused by iron salts. At least 95 % of the number of pieces in a lo
26、t should be free from stains caused by chromium salts, and the aggregate of the stained area in any one piece should not exceed 10 % of the total area of the piece.4.5 Shrinkage temperatureThe shrinkage temperature shall not be less than 95 C, when determined using the method specified in ISO 3380.4
27、.6 Chemical requirementsWet blue goat skins shall comply with the requirements given in Table 1.Table 1 Chemical requirementsCharacteristic RequirementVolatile matter, % As agreed between the interested partiespH of water extract (minimum) 3,5NOTE A minimum shrinkage temperature of 95 C would normal
28、ly require minimum chromic oxide content of 3,0 % relative to the dry mass, as determined by the method given by ISO 5398-1. Once the chromic oxide content has been determined in this way, it can be used to estimate how much more chromic oxide has to be added to achieve the desired level (i.e. the e
29、xtent of further rechroming)5 Sampling5.1 Sampling for routine testingThe number and location of laboratory samples taken for routine testing shall be as agreed between the interested parties.5.2 Sampling in case of disputeThe number of samples shall be as given in Table 2 and the location shall be
30、as specified in ISO 2418.2 ISO 2013 All rights reservedBS ISO 5431:2013ISO 5431:2013(E)Table 2 Number of samples to be taken in cases of disputeNumber of skins Number of samplesUp to 100 3101 to 300 4301 to 500 5501 to 700 6701 and over 75.3 Preparation of samplesPrepare samples by wiping off excess
31、 water and keeping wrapped in filter paper for 30 min without applying any extra pressure.6 Method of test6.1 Visual testsExamine the wet blue goat skins for uniformity of colour of the surface, penetration of chromium sulfate, absence of short hair and cleanness of the flesh side.6.2 Shrinkage temp
32、eratureDetermine the shrinkage temperature by the method specified in ISO 3380.6.3 Volatile matterDetermine the volatile matter by the method specified in ISO 4684.6.4 pH of the water extractDetermine the pH of the water extract by the method specified in ISO 4045.6.5 Effectiveness of the fungicideD
33、etermine the effectiveness of the fungicide by the method specified in ASTM D4576.7 Packaging and Marking7.1 PackagingWet blue goat skins shall be packaged suitably as agreed between the interested parties so as to preserve their original wet condition.7.2 MarkingThe following particulars shall be m
34、arked on each package or on a label attached to the package:a) the type of material (i.e. wet blue goat skin), and the trade name or brand name, if any;b) the name and address of the manufacturer;c) the month and year of the tanning; ISO 2013 All rights reserved 3BS ISO 5431:2013ISO 5431:2013(E)d) t
35、he number of skins;e) any other details desired by the purchaser.4 ISO 2013 All rights reservedBS ISO 5431:2013BS ISO 5431:2013ISO 5431:2013(E) ISO 2013 All rights reservedICS 59.140.30Price based on 4 pagesThis page deliberately left blankBSI is the national body responsible for preparing British S
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