1、BS ISO 1434:2016Natural rubber in bales Amount of bale coating DeterminationBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 1434:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 1434:2016.It supersedes BS ISO 1434:199
2、5 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/50, Raw materials (including latex) for use in the rubber industry.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport
3、 to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 77196 5 ICS 83.060 Compliance with a British Standard cannot confer immunity from legal obligations.
4、This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 1434:2016 ISO 2016Natural rubber in bales Amount of bale coating DeterminationCaoutchouc naturel
5、 en balles Quantit denduit DterminationINTERNATIONAL STANDARDISO1434Third edition2016-11-01Reference numberISO 1434:2016(E)BS ISO 1434:2016ISO 1434:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no
6、 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 ISOs membe
7、r body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 1434:2016ISO 1434:2016(E)Foreword iv1 Scope . 12 Sampling 12.1 General . 12.2 Preparation of the test po
8、rtion . 13 Ashing method 23.1 Principle 23.2 Apparatus 23.3 Procedure 24 Brushing or scraping method . 25 Expression of the results 36 Test report . 3Annex A (informative) Sample cutting die 4Annex B (informative) Amount of bale coating . 5Bibliography 6 ISO 2016 All rights reserved iiiContents Page
9、BS ISO 1434:2016ISO 1434:2016(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 intere
10、sted 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 with the International Electrotechnical
11、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 for the different types of ISO documen
12、ts 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 rights. ISO shall not be held responsible
13、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 this document is information given for the
14、 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) principles in the Technical Barriers to Trade (TBT)
15、 see the following URL: www.iso.org/iso/foreword.html.The committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry.This third edition cancels and replaces the second edition (ISO 1434:1995), wh
16、ich has been technically revised with the following changes: the scope has been reworded and the ashing method has been made the preferred method; the brushing or scraping method has been modified to align dimensions of specimen for ashing methods; the sampling procedure has been modified; the notes
17、 in the ashing method, stating the need for the correction of ash arising from the rubber itself, have been deleted.iv ISO 2016 All rights reservedBS ISO 1434:2016INTERNATIONAL STANDARD ISO 1434:2016(E)Natural rubber in bales Amount of bale coating DeterminationWARNING Persons using this Internation
18、al Standard should be familiar with normal laboratory practice. This International Standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with
19、 any national regulatory conditions.1 ScopeThis International Standard specifies two methods for the determination of the amount of bale coating present on the outside wrapper sheets of bales of natural rubber: ashing method; brushing or scraping method.The ashing method is the preferred method.NOTE
20、 1 The brushing or scraping procedure, while much faster, is not suitable for use on such rubbers which have holes on the surface where coatings could penetrate, making its removal difficult.NOTE 2 The ashing procedure is not suitable for coating materials which are affected by the ashing. In partic
21、ular, coatings containing carbonates or organic matter can give very low results.2 Sampling2.1 GeneralThe greater the number of bales in the sample, the more representative is the sample of the lot.But in most cases, practical considerations impose a limit on what is possible.The number of bales to
22、be chosen at random shall be agreed between the customer and the supplier.NOTE If applicable, a statistical sampling plan chosen from ISO 3951-2 can be used.2.2 Preparation of the test portionPneumatically punch out three test pieces of 50 mm 50 mm, selected at random from the outside wrapper sheets
23、, from any three contiguous sides of the bale, one piece from each side.If the ashing procedure is used, the thickness of the piece shall not exceed 4 mm.Handle and store the sample so as to minimize the loss of bale coating.Test pieces shall be punched out from the bales using a sample cutting die
24、(3.2.1). ISO 2016 All rights reserved 1BS ISO 1434:2016ISO 1434:2016(E)3 Ashing method3.1 PrincipleA weighed test portion is wrapped in ashless filter paper, preignited at 300 C 25 C for 1 h, followed by incineration in a muffle furnace at about 550 C 25 C for 2 h to 4 h until all the carbonaceous m
25、atter has been burnt off and constant mass is attained.NOTE This method is taken from ISO 247.3.2 ApparatusNormal laboratory equipment and the following.3.2.1 Sample cutting die (see Annex A), mounted on suitable device.3.2.2 Crucible, of silica or porcelain, with lid of capacity approximately 80 ml
26、.3.2.3 Weighing balance, to weigh accurately up to 1 mg.3.2.4 Bunsen burner, or similar type of gas burner.3.2.5 Desiccator, with efficient desiccant.3.2.6 Ashless filter paper, diameter about 150 mm.3.2.7 Muffle furnace, fitted with provision for controlling the air flow through the furnace and wit
27、h temperature controlling device to maintain a temperature of 550 C 25 C.3.3 ProcedurePunch out three test specimens from each of the three pieces removed from the bale, as per 2.2, taking care not to lose bale coating. Weigh each test specimen to the nearest 0,1 mg and wrap each test portion in an
28、ashless filter paper (3.2.6). Take care that the rubber does not ignite. If any material is lost due to spurting or frothing, repeat the above procedure with a new test portion.When the rubber has decomposed and a dry carbonaceous mass remains, transfer the crucible and its contents to the muffle fu
29、rnace (3.2.7), maintained at 550 C 25 C. Continue heating until a clean ash is obtained. Remove the crucible from the furnace; allow to cool to ambient temperature in the desiccator (3.2.5) and weigh to the nearest 0,1 mg.Then heat the crucible and its content for a further 30 min in the muffle furn
30、ace maintained at 550 C 25 C. Allow cooling to ambient temperature in the desiccators and re-weigh to the nearest 0,1 mg.Repeat the heating, cooling and weighing procedure until the difference between two successive weighings is less than 1 mg. Calculate the mass of the ash by difference.4 Brushing
31、or scraping methodPunch out three test specimens from each of the three pieces removed from the bale, as per 3.2, taking care not to lose bale coating. Weigh the test specimen to the nearest 0,1 mg. Remove the bale coating using a stiff wire brush or by scraping, taking care not to abrade rubber fro
32、m the wrapper sheet. Weigh the specimens after the removal of bale coating, to the nearest 0,1 mg.Calculate the mass of the bale coating by difference.2 ISO 2016 All rights reservedBS ISO 1434:2016ISO 1434:2016(E)5 Expression of the resultsCalculate the amount of bale coating per bale, expressed in
33、grams per kilogram of rubber, using the following formula:WAmAm=1221whereA1is the nominal surface area of the bale, in square millimetres;A2is the surface area of the test specimen, in square millimetres;m1is the nominal mass of the bale, in kilograms;m2is the mass, in grams, of the ash or bale coat
34、ing obtained from the test specimen from 3.3 or Clause 4.The final value of bale coating is obtained by averaging the individual values. The tolerance should be 5 %.6 Test reportThe test report shall include the following information:a) a reference to this International Standard, i.e. ISO 1434;b) a
35、reference to the method used;c) all details necessary for the identification of the sample;d) any operation not specified in this International Standard and any operation regarded as optional;e) the date of the test. ISO 2016 All rights reserved 3BS ISO 1434:2016ISO 1434:2016(E)Annex A (informative)
36、 Sample cutting dieNOTE All dimensions are in millimetres. The only critical dimension is that of cutting edge, 50 mm2.Figure A.1 Sample cutting die4 ISO 2016 All rights reservedBS ISO 1434:2016ISO 1434:2016(E)Annex B (informative) Amount of bale coatingThe “International Standards of Quality and Pa
37、cking for Natural Rubber Grades” (The Green Book), Part V, Section 7.C, specifies that the maximum weight of bale coating solids shall not exceed 16 oz (0,45 kg) per bale (of 0,14 m3in volume), i.e. 4 g bale coating per kilogram of rubber. ISO 2016 All rights reserved 5BS ISO 1434:2016ISO 1434:2016(
38、E)Bibliography1 ISO 247, Rubber Determination of ash2 ISO 248-1, Rubber, raw Determination of volatile-matter content Part 1: Hot-mill method and oven method3 ISO 1629, Rubber and latices Nomenclature4 ISO 3951-2, Sampling procedures for inspection by variables Part 2: General specification for sing
39、le sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection of independent quality characteristics5 Rubber Manufacturers Association. International Standards of Quality and Packing for Natural Rubber Grades (Green Book). 19696 ISO 2016 All rights reservedBS ISO 1434:2016BS
40、ISO 1434:2016ISO 1434:2016(E) ISO 2016 All rights reservedICS 83.060Price based on 6 pagesThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and services.BSI is incorporated by Royal Charter. Bri
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