1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 13226:2011Rubber Standard referenceelastomers (SREs) forcharacterizing the effect ofliquids on vulcanized rubbersBS ISO 13226:2011 BRITISH STANDARDNational forewordThis Br
2、itish Standard is the UK implementation of ISO 13226:2011. Itsupersedes BS ISO 13226:2005 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/22, Physical testing of rubber.A list of organizations represented on this committee can beobtained on request
3、to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 66335 2ICS 83.060Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was
4、 published under the authority of theStandards Policy and Strategy Committee on 30 November 2011.Amendments issued since publicationDate Text affectedBS ISO 13226:2011Reference numberISO 13226:2011(E)ISO 2011INTERNATIONAL STANDARD ISO13226Third edition2011-11-01Rubber Standard reference elastomers (
5、SREs) for characterizing the effect of liquids on vulcanized rubbers Caoutchouc lastomres de rfrence normaliss (SRE) pour la caractrisation de leffet des liquides sur les caoutchoucs vulcaniss BS ISO 13226:2011ISO 13226:2011(E) COPYRIGHT PROTECTED DOCUMENT ISO 2011 All rights reserved. Unless otherw
6、ise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright
7、office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2011 All rights reservedBS ISO 13226:2011ISO 13226:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword iv Introduction . v 1 Scope
8、1 2 Normative references 1 3 Composition . 2 4 Preparation . 2 5 Description . 2 6 Test sheet properties 2 7 Designation 2 8 Storage . 3 Annex A (normative) Acrylic rubbers: SRE-ACM/1 and SRE-ACM/1X 4 Annex B (normative) Acrylonitrile-butadiene rubbers: SRE-NBR 28/P and SRE-NBR 28/PX . 6 Annex C (no
9、rmative) Acrylonitrile-butadiene rubbers: SRE-NBR 28/S, SRE-NBR 28/SX, SRE-NBR 34/S and SRE-NBR 34/SX 9 Annex D (normative) Acrylonitrile-butadiene rubbers: SRE-NBR/M . 13 Annex E (normative) Acrylonitrile-butadiene rubbers: SRE-NBR/L 14 Annex F (normative) Chlorobutyl rubbers: SRE-CIIR/1 15 Annex G
10、 (normative) Chloroprene rubbers: SRE-CR/1 16 Annex H (normative) Ethylene-propylene rubbers: SRE-EPM/1 17 Annex I (normative) Fluoropolymer rubbers: SRE-FKM/1 18 Annex J (normative) Fluoropolymer rubbers: SRE-FKM/2X 19 Annex K (normative) Hydrogenated acrylonitrile-butadiene rubbers: SRE-HNBR/1 and
11、 SRE-HNBR/1X 22 Annex L (normative) Natural rubbers: SRE-NR/1 26 Annex M (normative) Silicone rubbers: SRE-MQ/1 . 27 Annex N (normative) Silicone rubbers: SRE-VMQ1 and SRE-VMQ/1X . 28 BS ISO 13226:2011ISO 13226:2011(E) iv ISO 2011 All rights reservedForeword ISO (the International Organization for S
12、tandardization) 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 which a technical committee has been established has the ri
13、ght 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 matters of electrotechnical standardization. Internationa
14、l Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as
15、an International Standard requires approval by at least 75 % of the member bodies casting a vote. 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 all such patent rights. ISO
16、 13226 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 2, Testing and analysis. This third edition cancels and replaces the second edition (ISO 13226:2005), which has been revised to eliminate errors and inconsistencies. It also incorporates the Technical C
17、orrigendum ISO 13226:2005/Cor.1:2007. BS ISO 13226:2011ISO 13226:2011(E) ISO 2011 All rights reserved vIntroduction The materials covered by this International Standard are specified in Annexes A to N. The following standard reference elastomers are included: a) Acrylic rubbers: SRE-ACM/1 and SRE-AC
18、M/1X b) Acrylonitrile-butadiene rubbers: SRE-NBR 28/P and SRE-NBR 28/PX SRE-NBR 28/S, SRE-NBR 28/SX, SRE-NBR 34/S and SRE-NBR 34/SX SRE-NBR/M SRE-NBR/L c) Chlorobutyl rubbers: SRE-CIIR/1 d) Chloroprene rubbers: SRE-CR/1 e) Ethylene-propylene rubbers: SRE-EPM/1 f) Fluoropolymer rubbers: SRE-FKM/1 SRE
19、-FKM/2X g) Hydrogenated acrylonitrile-butadiene rubbers: SRE-HNBR/1 and SRE-HNBR/1X h) Natural rubbers: SRE-NR/1 i) Silicone rubbers: SRE-MQ/1 SRE-VMQ/1 and SRE-VMQ/1X BS ISO 13226:2011BS ISO 13226:2011INTERNATIONAL STANDARD ISO 13226:2011(E) ISO 2011 All rights reserved 1Rubber Standard reference e
20、lastomers (SREs) for characterizing the effect of liquids on vulcanized rubbers WARNING Persons using this International Standard should be familiar with normal laboratory practice. This standard does not purport to address all of the safety problems, if any, associated with its use. It is the respo
21、nsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. IMPORTANT Certain procedures specified in this International Standard might involve the use or generation of substances, or the generation of waste, that could
22、 constitute a local environmental hazard. Reference should be made to appropriate documentation on safe handling and disposal after use. 1 Scope This International Standard specifies requirements for vulcanized rubbers in sheet form for use as standards in characterizing the effect of test liquids a
23、nd service fluids. Details of the individual standard reference elastomers are listed in the annexes. The compounding and preparation ensure that the property profile agrees sufficiently with that of the material group represented, while the simple formulation ensures reliable reproducibility. The s
24、pecified property changes of the SRE when in contact with a fluid under specified conditions may be included as supplementary data in specifications for the fluid concerned. This International Standard is not designed to provide formulations of elastomeric-product compositions for actual service. 2
25、Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 37, Rubber, vulcanized o
26、r thermoplastic Determination of tensile stress-strain properties ISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD) ISO 1817, Rubber, vulcanized or thermoplastic Determination of the effect of liquids ISO 2230, Rubber products Guidelines fo
27、r storage ISO 2393, Rubber test mixes Preparation, mixing and vulcanization Equipment and procedures ISO 2781:2008, Rubber, vulcanized or thermoplastic Determination of density ISO 7619-1, Rubber, vulcanized or thermoplastic Determination of indentation hardness Part 1: Durometer method (Shore hardn
28、ess) BS ISO 13226:2011ISO 13226:2011(E) 2 ISO 2011 All rights reservedISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods 3 Composition The materials shall be homogeneous mixes of the ingredients shown in the relevant annex, in the proportions sh
29、own, weighed to the accuracy required in ISO 2393. All ingredients shall be of recognized rubber quality. The identification of proprietary materials as suitable ingredients does not exclude the use of other materials that can be shown to meet the requirements of the standard. If necessary, the quan
30、tity of carbon black or silica may be adjusted from one consignment of rubber to another to give properties within the limits specified in the annexes. If the filler content is adjusted, the details shall be declared. 4 Preparation The mixing of compounds and the vulcanization of test sheets shall b
31、e carried out in accordance with ISO 2393 and, where appropriate, as modified by detailed conditions and procedures given in the annexes. If a mould release agent is needed, dry PTFE mould lubricant shall be used. 5 Description The vulcanized test sheets shall be 2 mm 0,2 mm thick when measured in a
32、ccordance with ISO 23529, and free from surface defects and internal voids when viewed with normally corrected vision. A “lot” of sheets is those sheets made from a single batch of rubber mix vulcanized under the same conditions. A “pressing” is the quantity of sheets produced at the same time in a
33、single moulding operation. 6 Test sheet properties The test sheets shall be characterized by one or more physical properties in accordance with the relevant ISO standard test method. Properties and tolerances for individual materials are given in the annexes. All sheets shall be tested for complianc
34、e with the requirements of Clause 5. A sample sheet from each lot shall be tested for the properties of interest for compliance with the tolerances given in the appropriate annex. The actual values obtained shall be reported. The test pieces necessary for determining material properties shall be tak
35、en from the test sheets in such a way that a minimum distance from the edge of the sheets is maintained. Dumb-bell test pieces shall be taken with their longitudinal axis parallel to the direction of milling of the moulding blank. 7 Designation Each elastomer shall be designated as ISO 13226 SRE-A/B
36、 where ISO 13226 is this International Standard, SRE is the abbreviation for standard reference elastomer and, after the hyphen, A is a set of code-letters designating the polymer type and B is a descriptor identifying the particular compound. Some designations end with the letter X to signify that
37、additional test requirements apply. BS ISO 13226:2011ISO 13226:2011(E) ISO 2011 All rights reserved 38 Storage Test sheets shall be stored in accordance with ISO 2230. After one year, they shall be retested or disposed of. If the sheets still meet the test requirements, they may be stored and used f
38、or a further year. NOTE The yearly tests apply irrespective of the type of rubber used. BS ISO 13226:2011ISO 13226:2011(E) 4 ISO 2011 All rights reservedAnnex A (normative) Acrylic rubbers: SRE-ACM/1 and SRE-ACM/1X A.1 Purpose These SREs are representative of ACM materials such as are used, for inst
39、ance, for parts in contact with petroleum products in the mechanical-engineering and automobile sectors. They are used for the characterization of service fluids such as mineral oils, fuels, lubricants, hydraulic fluids, coolants and refrigerants with regard to their effect on vulcanized acrylic rub
40、bers. The changes in mass, volume, hardness, tensile strength and elongation at break of the SRE when in contact with the service fluid under specified conditions may be included as supplementary data in specifications for the fluid concerned. A.2 Composition Table A.1 Composition of the SRE Ingredi
41、ents Parts by mass Acrylic rubberaStearic acid Pentaerythrite stearatebOctylated diphenylamine (ODPA)cCarbon black, N550 Sodium stearate Quaternary ammonium saltsd100,0 1,0 2,0 2,0 65,0 4,0 2,0 Total 176,0 aHyTemp 4051from Zeon Chemicals L.P., or equivalent. bStruktol WB 222from Schill ISO 13226 SRE
42、-NBR 34/S and SRE-NBR 34/SX (ACN content 34 %). The changes in mass, volume, hardness, tensile strength and elongation at break of the SRE when in contact with the service fluid under specified conditions may be included as supplementary data in specifications for the fluid concerned. C.2 Compositio
43、n Table C.1 Composition of the SRE Ingredients Parts by mass 28/S28/SX 34/S 34/SX NBR (ACN content 28 %)aNBR (ACN content 34 %)bPolymerized 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ)cZinc oxide, precipitateddStearic acid Carbon black, N550 Tetramethylthiuram disulfide (TMTD)eN-cyclohexylbenzothiazol
44、e-2-sulfenamide (CBS)fSulfur 100,0 2,0 5,0 1,0 65,0 2,5 1,5 0,2 100,0 2,0 5,0 1,0 65,0 2,5 1,5 0,2 Total 177,2 177,2 aPerbunan NT 2845from Lanxess AG, or equivalent. bPerbunan NT 3445from Lanxess AG, or equivalent. cVulkanox HS/LGfrom Lanxess AG, or equivalent. dZinkoxyd aktivfrom Lanxess AG, or equ
45、ivalent. eVulkacit Thiuram/Cfrom Lanxess AG, or equivalent. fVulkacit CZ/Cfrom Lanxess AG, or equivalent. BS ISO 13226:2011ISO 13226:2011(E) 10 ISO 2011 All rights reservedC.3 Recommended mixing procedures Prepare a masterbatch without the TMTD, CBS and sulfur in an internal mixer followed by homoge
46、nizing and addition of vulcanizing ingredients on a two-roll mill (see C.6.1). To obtain good sulfur dispersion, use about 10 % of the rubber to make a sulfur masterbatch. Alternatively, mix completely on a two-roll mill. Prepare a sulfur masterbatch and store it for between 30 min and 24 h before p
47、roceeding with the main mix (see C.6.2). C.4 Vulcanization Condition the sheeted compound at ambient temperature for 2 h to 24 h. Press-cure at 160 C 2 C for 20 min 1 min. C.5 Test sheet properties SRE-NBR 28/S and SRE-NBR 34/S materials shall fulfil the basic property given in Table C.2. Additional
48、 properties may be specified (see Table C.3). SRE-NBR 28/SX and SRE-NBR 34/SX materials shall fulfil both the basic and the additional properties. Table C.2 Basic property Property Unit Requirement Test method 28/S 28/SX 34/S 34/SX Increase in mass in test liquid B for fuels, as in ISO 1817 % 26 to
49、29 17 to 20 ISO 1817, three type 2 dumb-bell test piecesaimmersed for 22 h 0,5 h at 23 C 2 C Test piece/test liquid volume ratio: 1/(30 5) aAs specified in ISO 37. Table C.3 Additional properties in the initial state Property Unit Requirement Test method 28/SX 34/SX Tensile strength Elongation at break MPa % 20 to 25 300 to 400 20 to 25 300 to 400 ISO 37, five type 2 dumb-bell test pieces Hardness Shore AIRHD 76 to 81 76 to 81 77 to 82 77 to 82
