1、BSI Standards Publication BS ISO 8312:2015 Rubber compounding ingredients Stearic acid Definition and test methodsBS ISO 8312:2015 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 8312:2015. It supersedes BS ISO 8312:1999 which is withdrawn. The UK participati
2、on in its preparation was entrusted to Technical Committee PRI/50, Rubber - Raw, natural and synthetic, including latex and carbon black. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary
3、provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 89097 0 ICS 83.040.20 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard wa
4、s published under the authority of the Standards Policy and Strategy Committee on 30 September 2015. Amendments issued since publication Date Text affectedBS ISO 8312:2015 ISO 2015 Rubber compounding ingredients Stearic acid Definition and test methods Ingrdients de mlange du caoutchouc Acide stariq
5、ue Dfinition et mthodes dessai INTERNATIONAL STANDARD ISO 8312 Second edition 2015-09-15 Reference number ISO 8312:2015(E)BS ISO 8312:2015ISO 8312:2015(E)ii ISO 2015 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in Switzerland All rights reserved. Unless otherwise specified, n
6、o 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 memb
7、er body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.orgBS ISO 8312:2015ISO 8312:2015(E)Foreword iv 1 Scope . 1 2 Normative references 1 3 Terms and definition
8、s . 2 4 Sampling 2 5 Physical and chemical properties . 2 6 Test report . 2 Annex A (normative) Determination of ash at 550 C 25 C 4 Annex B (normative) Determination of copper content Atomic absorption spectrometric method 6 Annex C (normative) Determination of manganese content Atomic absorption s
9、pectrometric method 8 Annex D (normative) Determination of iron content Atomic absorption spectrometric method .10 Annex E (normative) Determination of nickel content Atomic absorption spectrometric method .12 Annex F (normative) Determination of mineral acidity Titrimetric method 14 Annex G (normat
10、ive) Determination of copper content Molecular absorption spectrometric method .16 Annex H (normative) Determination of manganese content Molecular absorption spectrometric method .17 Annex J (normative) Determination of iron content Molecular absorption spectrometric method .18 Annex K (normative)
11、Determination of nickel content Molecular absorption spectrometric method .19 Annex L (normative) Classification of stearic and stearic acid/palmitic acid blends and typical physical and chemical properties 20 Bibliography .22 ISO 2015 All rights reserved iii Contents PageBS ISO 8312:2015ISO 8312:20
12、15(E) Foreword ISO (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 whi
13、ch 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 Commission (IEC) on all m
14、atters 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 documents should be noted. This
15、 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 for identifying any or
16、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 convenience of users
17、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) see the following URL: Foreword - Supplementary
18、 information 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 second edition cancels and replaces the first edition (ISO 8312:1999), of which it constitutes a minor revision w
19、ith the following changes: atomic absorption spectrometric method is stated as the preferred method in the Scope; Normative references in Clause 2 were updated and a Bibliography was added.iv ISO 2015 All rights reservedBS ISO 8312:2015INTERNATIONAL ST ANDARD ISO 8312:2015(E) Rubber compounding ingr
20、edients Stearic acid Definition and test methods WARNING Persons using this International 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
21、user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. 1 Scope This International Standard defines stearic acid (including blends of stearic and palmitic acid) for use as a compounding ingredient in the rubber industry and specifie
22、s the test methods for describing its properties. Classification of stearic acid and stearic acid/palmitic acid blends according to iodine value and typical chemical and physical properties for such materials for use in the rubber industry are given in Annex L. Annex L is given for information only.
23、 In this International Standard, the atomic absorption spectrometric method is the preferred method. 2 Normative references The 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 cite
24、d applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 660, Animal and vegetable fats and oils Determination of acid value and acidity ISO 662, Animal and vegetable fats and oils Determination of moisture and volatile matter content I
25、SO 935, Animal and vegetable fats and oils Determination of titre ISO 1042:1998, Laboratory glassware One-mark volumetric flasks ISO 3596, Animal and vegetable fats and oils Determination of unsaponifiable matter Method using diethyl ether extraction ISO 3657, Animal and vegetable fats and oils Dete
26、rmination of saponification value ISO 3961, Animal and vegetable fats and oils Determination of iodine value ISO 4058, Magnesium and its alloys Determination of nickel Photometric method using dimethylglyoxime ISO 5508, Animal and vegetable fats and oils Analysis by gas chromatography of methyl este
27、rs of fatty acids ISO 6685, Chemical products for industrial use General method for determination of iron content 1,10-Phenanthroline spectrophotometric method ISO 7780:1998, Rubbers and rubber latices Determination of manganese content Sodium periodate photometric methods ISO 8053, Rubber and latex
28、 Determination of copper content Photometric method ISO 2015 All rights reserved 1BS ISO 8312:2015ISO 8312:2015(E) ISO 12966-2, Animal and vegetable fats and oils Gas chromatography of fatty acid methyl esters Part 2: Preparation of methyl esters of fatty acids ISO 15528, Paints, varnishes and raw m
29、aterials for paints and varnishes Sampling 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 stearic acid (for use in the rubber industry) mixture of straight-chain saturated fatty acids composed substantially of stearic acid in the form C 17 H
30、 35 COOH and palmitic acid in the form C 15 H 31 COOH 4 Sampling Sampling shall be carried out in accordance with ISO 15528, using a stainless-steel sampling device. 5 Physical and chemical properties The physical and chemical properties shall be determined by the methods of test listed in Table 1.
31、Table 1 List of physical and chemical properties of stearic acid and the methods used for their determination Property Test method Acid value, mg KOH/g Saponification value, mg KOH/g Titre value, C Fatty acids, C 16to C 18 , including unsaturates, percentage (mass fraction) Total matter volatile at
32、105 C 3 C, percentage (mass fraction) Ash at 550 C 25 C, percentage (mass fraction) lodine value, g/100 g Mineral acidity, cm 3 /100 g Copper, mg/kg Manganese, mg/kg Iron, mg/kg Unsaponifiable matter, percentage (mass fraction) Nickel, mg/kg ISO 660 ISO 3657 ISO 935 ISO 5508 and ISO 12966-2 ISO 662,
33、 oven method Annex A ISO 3961 Annex F Annex B aor G Annex C aor H Annex D aor J ISO 3596 Annex E aor K Note Where an atomic absorption spectrometer is not available, the molecular absorption spectrometric methods given in Annexes G, H, J and K may be used. aFor speed and simplicity, the methods give
34、n in Annexes B, C, D and E are recommended. 6 Test report The test report shall include the following information: a) all details necessary for complete identification of the product tested; b) a reference to this International Standard, i.e. ISO 8312;2 ISO 2015 All rights reservedBS ISO 8312:2015IS
35、O 8312:2015(E) c) the results obtained: percentage ash w A , from A.4; copper content w Cu , from B.6 or from Annex G (state the method used); manganese content w Mn , from C.6 or from Annex H (state the method used); iron content w Fe , from D.6 or from Annex J (state the method used); nickel conte
36、nt, w Ni , from E.6 or from Annex K (state the method used); mineral acidity, N ma , from F.5; the results of other tests which may have been performed (see Table 1); d) any unusual features noted during the determinations; e) any operations not included in this International Standard, or in other I
37、nternational Standards cited, which might have affected the results; f) the dates of the tests. ISO 2015 All rights reserved 3BS ISO 8312:2015ISO 8312:2015(E) Annex A (normative) Determination of ash at 550 C 25 C A.1 Principle A weighed test portion is carefully volatilized without ignition, and th
38、e residue is ashed in a furnace at 550 C 25 C. The mass of ash is determined as a percentage of the mass of the original test portion. A.2 Apparatus Ordinary laboratory apparatus, plus the following: A.2.1 Silica crucible. A.2.2 Heat-resistant non-conducting (insulating) material in plate form, appr
39、oximately 150 mm 150 mm. A.2.3 Analytical balance, accurate to 0,1 mg. A.2.4 Muffle furnace, capable of being maintained at a temperature of 550 C 25 C. A.3 Procedure A.3.1 Heat the clean silica crucible (A.2.1) to 600 C, allow to cool in a desiccator and weigh empty to 0,1 mg. A.3.2 Place about 10
40、g of sample in this crucible and re-weigh to 0,1 mg. Place in a hole in the sheet of heat-resistant material (A.2.2). A.3.3 Heat the crucible and contents gently in order to volatilize the test portion, taking care to ensure that the vapour does not ignite and that hot gases from the burner do not e
41、nter the crucible. A.3.4 When all volatile material has been removed, place the crucible in the muffle furnace (A.2.4), maintained at 550 C 25 C, and ignite the contents for 30 min. A.3.5 Place the crucible in a desiccator and allow to cool. A.3.6 Re-weigh the crucible to the nearest 0,1 mg. A.3.7 R
42、epeat the operations specified in A.3.3, A.3.4 and A.3.5, until successive mass determinations differ by less than 2 mg. A.3.8 Retain the ash obtained in A.3.6 if subsequent use can be made in another test.4 ISO 2015 All rights reservedBS ISO 8312:2015ISO 8312:2015(E) A.4 Expression of results Calcu
43、late the percentage ash, w A , in accordance with Formula (A.1): (A.1) wherew A is the percentage ash;m 0 is the mass, in grams, of the test portion;m 1 is the mass, in grams, of the empty crucible;m 2 is the mass, in grams, of the crucible and ash. ISO 2015 All rights reserved 5BS ISO 8312:2015ISO
44、8312:2015(E) Annex B (normative) Determination of copper content Atomic absorption spectrometric method B.1 Principle Ash made in accordance with Annex A is dissolved in hydrochloric acid and the solution made up to standard volume. The absorbance is measured at 324,7 nm in an atomic absorption spec
45、trometer. The copper content is determined by reference to a calibration graph prepared by measuring the absorbance of standard copper solutions. B.2 Reagents During the analysis, use only reagents of recognized analytical grade, and only distilled water or water of equivalent purity. B.2.1 Hydrochl
46、oric acid, a mass fraction of 10 % solution. B.2.2 Copper, standard solution corresponding to 10 mg of Cu per dm 3 . B.3 Apparatus Ordinary laboratory apparatus, plus the following: B.3.1 Atomic absorption spectrometer, fitted with a copper hollow-cathode lamp. B.3.2 One-mark volumetric flasks, two
47、of capacity 10 cm 3and six of capacity 50 cm 3 , complying with the requirements of ISO 1042:1998, class A. B.4 Procedure B.4.1 Obtain a sample of ash by conducting the determination specified in Annex A. B.4.2 Dissolve the ash so obtained in 5 cm 3of dilute hydrochloric acid (B.2.1). Transfer the s
48、olution quantitatively to a 10 cm 3one-mark volumetric flask (see B.3.2). B.4.3 Dilute the digested ash to exactly 10 cm 3in the one-mark volumetric flask by adding water. B.4.4 Set the wavelength of the spectrometer (B.3.1) to 324,7 nm and aspirate the test solution into the flame, followed immedia
49、tely by water, and then blank solution made up from the same reagents and using the same procedure but omitting the test portion. B.4.5 Repeat this procedure and record the mean values of absorbance of the test solution and the blank test solution.6 ISO 2015 All rights reservedBS ISO 8312:2015ISO 8312:2015(E) B.5 Preparation of the calibration graph B.5.1 Preparation of solutions Into a serie
