BS ISO 1795-2017 Rubber raw natural and raw synthetic Sampling and further preparative procedures《天然和合成生橡胶 取样和样品制备规程》.pdf

1、Rubber, raw natural and raw synthetic Sampling and further preparative proceduresBS ISO 1795:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 ISO 2017Rubber, raw natural and raw synthetic Sampling and further preparative proceduresCaoutchouc, naturel brut et synt

2、htique brut Mthodes dchantillonnage et de prparation ultrieureINTERNATIONAL STANDARDISO1795Fifth edition2017-06Reference numberISO 1795:2017(E)National forewordThis British Standard is the UK implementation of ISO 1795:2017. It supersedes BS ISO 1795:2007, which is withdrawn.The UK participation in

3、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 to include all the necessary provisions of a

4、 contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 92834 5ICS 83.040.10Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under th

5、e authority of the Standards Policy and Strategy Committee on 31 July 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS ISO 1795:2017 ISO 2017Rubber, raw natural and raw synthetic Sampling and further preparative proceduresCaoutchouc, naturel brut et synthtique

6、brut Mthodes dchantillonnage et de prparation ultrieureINTERNATIONAL STANDARDISO1795Fifth edition2017-06Reference numberISO 1795:2017(E)BS ISO 1795:2017ISO 1795:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise

7、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

8、or ISOs member 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 1795:2017ISO 1795:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 20

9、17, Published in SwitzerlandAll 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.

10、 Permission can be requested from either ISO at the address below or ISOs member 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.orgISO 1795:2017(E)Foreword iv1 Sco

11、pe . 12 Normative references 13 Terms and definitions . 14 Method of selecting the sample. 25 Method of taking the laboratory sample . 26 Testing . 27 Preparation of test samples 37.1 General . 37.2 Natural rubber . 37.2.1 Homogenizing 37.2.2 Chemical and physical tests 37.2.3 Mooney viscosity . 37.

12、2.4 Plasticity retention index (PRI) . 37.2.5 Vulcanization characteristics 37.3 Synthetic rubbers . 37.3.1 Chemical and physical tests 37.3.2 Mooney viscosity . 47.3.3 Vulcanization characteristics 58 Sampling report. 5 ISO 2017 All rights reserved iiiContents PageBS ISO 1795:2017ISO 1795:2017(E)Fo

13、rewordISO (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 which a tech

14、nical 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 matters of

15、 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 document

16、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 all such

17、 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 and do

18、es not constitute an endorsement.For an explanation on the voluntary nature of standards, 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 Trad

19、e (TBT) see the following URL: www .iso .org/ iso/ foreword .htmlThis document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry.This fifth edition cancels and replaces the fourth edition (ISO

20、1795:2007), which has been technically revised. The main changes compared to the previous edition are as follows: the normative references in Clause 2 have been updated; in Clause 4, it has been clarified that the number of bales to be chosen at random represent the lot; in Clause 5, the note statin

21、g that the surface layer may be removed if it is contaminated with talc or a release agent, has been deleted; the title of 7.2.1 has been changed from “milling” to “homogenizing”; in 7.3.1, a sentence has been added to specify to take directly the test samples from the laboratory sample when using t

22、hermogravimetric methods in ISO 248-2 for the determination of volatile-matter content.iv ISO 2017 All rights reservedBS ISO 1795:2017ISO 1795:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work

23、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 right to be represented on that committee. International organizations, governmental and non-government

24、al, 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.The procedures used to develop this document and those intended for its further maintenance are described in the I

25、SO/IEC Directives, Part 1. In particular the different approval criteria needed 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 (see www .iso .org/ directives).Attention is drawn to the possi

26、bility 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. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of

27、 patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related

28、to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .htmlThis document was prepared by Technical Committee ISO/TC 45, Rubber and rubber prod

29、ucts, Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry.This fifth edition cancels and replaces the fourth edition (ISO 1795:2007), which has been technically revised. The main changes compared to the previous edition are as follows: the normative references in Clause

30、 2 have been updated; in Clause 4, it has been clarified that the number of bales to be chosen at random represent the lot; in Clause 5, the note stating that the surface layer may be removed if it is contaminated with talc or a release agent, has been deleted; the title of 7.2.1 has been changed fr

31、om “milling” to “homogenizing”; in 7.3.1, a sentence has been added to specify to take directly the test samples from the laboratory sample when using thermogravimetric methods in ISO 248-2 for the determination of volatile-matter content.iv ISO 2017 All rights reserved INTERNATIONAL STANDARD ISO 17

32、95:2017(E)Rubber, raw natural and raw synthetic Sampling and further preparative proceduresWARNING Persons using this document should be familiar with normal laboratory practice. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsi

33、bility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions.1 ScopeThis document specifies a method for the sampling of raw rubber in bales, blocks or packages and further procedures carried out on the samples to prepare te

34、st samples for chemical and physical tests.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edi

35、tion of the referenced document (including any amendments) applies.ISO 248-1, Rubber, raw Determination of volatile-matter content Part 1: Hot-mill method and oven methodISO 248-2, Rubber, raw Determination of volatile-matter content Part 2: Thermogravimetric methods using an automatic analyser with

36、 an infrared drying unitISO 289-1, Rubber, unvulcanized Determinations using a shearing-disc viscometer Part 1: Determination of Mooney viscosityISO 1658, Natural rubber (NR) Evaluation procedureISO 2393, Rubber test mixes Preparation, mixing and vulcanization Equipment and proceduresISO 2930, Rubbe

37、r, raw natural Determination of plasticity retention index (PRI)ISO 3951-2, Sampling procedures for inspection by variables Part 2: General specification for single sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection of independent quality characteristicsISO 23529, Rub

38、ber General procedures for preparing and conditioning test pieces for physical test methods3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Elec

39、tropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obpNOTE All references to “bales” include blocks and packages of rubber in chip, powder or sheet form.3.1lotassembly of bales of rubber bearing the same grade and lot marks

40、ISO 2017 All rights reserved 1BS ISO 1795:2017ISO 1795:2017(E)3.2samplegroup of bales selected to represent the lot3.3laboratory samplerubber taken from a bale of the sample to represent the bale3.4combined laboratory samplequantity of rubber which represents the sample, prepared by blending togethe

41、r equal parts of each of the laboratory samples to give a homogeneous sample3.5test samplerubber taken from the laboratory sample or the combined laboratory sample for testing, including the preparation of test pieces3.6test piecerubber taken from a test sample in order to carry out a specific testN

42、ote 1 to entry: Some standards use the synonymous term “test specimen”.4 Method of selecting the sampleThe 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 t

43、o be chosen at random, to represent the lot, shall be agreed between customer and supplier. If applicable, a statistical sampling plan chosen from ISO 3951-2 shall be used.5 Method of taking the laboratory sampleThe preferred method of taking a laboratory sample from each of the selected bales is th

44、e following.Remove the outer wrapping sheets, polyethylene wrapping, bale coating or other surface material from the bale and make two cuts, without the use of lubricant, through the entire bale, normal to the bale faces of largest surface area, so that a cross-sectional slice is removed from the mi

45、ddle of the bale. For referee purposes, this preferred method shall be used.Alternatively, a laboratory sample may be taken from any convenient part of the bale.In each case, the total mass of the laboratory sample shall be between 350 g and 1 500 g, depending on the tests to be carried out. If the

46、rubber is in chip or powder form, a similar quantity shall be taken at random from the package.Unless the laboratory sample is used immediately, it shall be placed in a light-proof and moisture-proof container or package of not more than twice its volume until it is required.6 Testing6.1 Each labora

47、tory sample shall be tested and reported upon separately.6.2 For quality-control purposes, a combined laboratory sample (see 3.4) may be used for the determination of chemical properties and vulcanization characteristics.2 ISO 2017 All rights reservedBS ISO 1795:2017ISO 1795:2017(E)3.2samplegroup of

48、 bales selected to represent the lot3.3laboratory samplerubber taken from a bale of the sample to represent the bale3.4combined laboratory samplequantity of rubber which represents the sample, prepared by blending together equal parts of each of the laboratory samples to give a homogeneous sample3.5

49、test samplerubber taken from the laboratory sample or the combined laboratory sample for testing, including the preparation of test pieces3.6test piecerubber taken from a test sample in order to carry out a specific testNote 1 to entry: Some standards use the synonymous term “test specimen”.4 Method of selecting the sampleThe 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