1、BRITISH STANDARD BS EN ISO 308:1998 BS 2782-4-451C: 1998 Plastics Phenolic moulding materials Determination of acetone-soluble matter (apparent resin content of material in the unmoulded state) The European Standard EN ISO 308:1997 has the status of a British Standard ICS 83.080.10BSEN ISO308:1998 T
2、his British Standard, having been prepared under the directionof the Sector Board forMaterials and Chemicals, waspublished under the authorityof the Standards Boardand comes into effect on 15 January 1998 BSI 03-1999 ISBN 0 580 28877 3 National foreword This British Standard is the English language
3、version of EN ISO 308:1997. It is identical with ISO 308:1994. It supersedes BS 2782-4:Method 451C:1978 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PRI/21, Testing of plastics, which has the responsibility to: aid enquirers to understand the text;
4、 present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee
5、can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement t
6、hese international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessa
7、ry provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN IS
8、O title page, page 2, the ISO title page, page ii, pages 1 to 3 and aback cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date Co
9、mmentsBSEN ISO308:1998 BSI 03-1999 i Contents Page National foreword Inside front cover Foreword 2 Foreword ii Text of EN ISO 308 1ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 308 November 1997 ICS 83.080.10 Descriptors: See ISO document English version Plastics Phenolic moulding
10、 materials Determination of acetone-soluble matter (apparent resin content of material in the unmoulded state) (ISO 308:1994) Plastiques Matires mouler base de phnoplastes Dtermination des matires solubles dans lactone (teneur apparente en rsine des matires ltat non moul) (ISO 308:1994) Kunststoffe
11、Phenolharz-Formmassen Bestimmung des acetonlslichen Anteils (Scheinbarer Harzgehalt von Formmassen in unverarbeitetem Zustand) (ISO 308:1994) This European Standard was approved by CEN on 16 October 1997. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the c
12、onditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in th
13、ree official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of A
14、ustria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Centr
15、al Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 308:1997 EENISO 308:1997 BSI 03-1999 2 Foreword The text of the International Standard from Technical Committee ISO/TC61 “
16、Plastics” of the International Organization for Standardization (ISO) has been taken over as an European Standard by Technical Committee CEN/TC249 “Plastics”, the secretariat of which is held by IBN. This European Standard shall be given the status of a national standard, either by publication of an
17、 identical text or by endorsement, at the latest by May 1998, and conflicting national standards shall be withdrawn at the latest by May 1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Stand
18、ard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard ISO308:1994 has been approved by CEN as a
19、European Standard without any modification. Contents Page 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Principle 1 5 Reagent 1 6 Apparatus 1 7 Preparation of sample 1 8 Procedure 2 9 Expression of results 3 10 Test report 3 Figure 1 Extraction apparatus 2EN ISO308:1997 ii Foreword ISO (the I
20、nternational 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 technical committee
21、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 electrotechnica
22、l standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75% of the member bodies casting a vote. International Standard ISO 308 was prepared by Technica
23、l Committee ISO/TC61, Plastics, Subcommittee SC12, Thermosetting materials. This third edition cancels and replaces the second edition (ISO308:1981), of which it constitutes a minor revision. Descriptors: Plastics, phenoplasts, moulding materials, chemical analysis, determination of content, resins,
24、 soluble matter, acetone, gravimetric analysisENISO 308:1997 BSI 03-1999 1 1 Scope This International Standard specifies a gravimetric method for the determination of the amount of matter that can be extracted by acetone, at a temperature near its boiling point, from a sample of finely divided pheno
25、lic moulding material. The method applies only to moulding materials based upon novolak resins and not to those based upon resols, as the latter type of resin may not be completely soluble in acetone. In this International Standard, the amount of acetone-soluble matter is reported as the apparent re
26、sin con-tent because, although the extract consists mainly of phenolic resin and hexamine, other acetone-soluble components such as lubricants and colorants or natural resins from the filler are normally also present and will therefore be reported as resin. 2 Normative references The following stand
27、ards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to
28、investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 472:1988, Plastics Vocabulary. ISO 800:1992, Plastics Phenolic moulding materials Specification. 3 Definitions
29、For the purposes of this International Standard, the definitions of moulding materials based on phenolic resins, novolak resins and resol resins given in ISO472 and ISO800 apply. 4 Principle The acetone-soluble matter is extracted, using hot acetone, from a finely divided test portion. The extract i
30、s dried under controlled conditions and weighed. 5 Reagent 5.1 Acetone, pure. 6 Apparatus 6.1 Reduction device, for reducing coarse materials to a finer state of division. 6.2 Balance, accurate to 1 mg. 6.3 Extraction apparatus, of the type shown in Figure 1. (A glass filter crucible may be used ins
31、tead of a single-thickness extraction thimble.) The single-thickness extraction thimble, which shall be free from acetone-soluble matter, together with a loose plug of cotton wool, if used, which shall also be free from acetone-soluble matter, shall be dried for 2 h in the oven (6.4) at approximatel
32、y105 C and stored in the desiccator(6.5) until required. It is permissible to use a modified Soxhlet apparatus, provided that the material in the extraction thimble is surrounded by the vapour of the solvent at its boiling point. Any other extraction apparatus may be used, provided that it can be sh
33、own to give similar results. 6.4 Drying oven, capable of being maintained at approximately105 C. 6.5 Desiccator. 6.6 Weighing bottle, with ground-glass stopper. 7 Preparation of sample 7.1 Take a fully representative sample of the moulding material. If the material is in the form of preforms, flakes
34、, coarse pieces or sheet (felted, oriented or woven), reduce it to powder or small pieces using the reduction device (6.1) before the test, taking care to avoid overheating. The thickness of the particles obtained shall not exceed 1,5mm and their other dimensions shall not exceed5mm. The sample shou
35、ld not be ground too finely or it may tend to agglomerate in the extraction thimble. Take care that no resin is lost while the sample is being reduced to powder or small pieces.ENISO 308:1997 2 BSI 03-1999 7.2 Dry at least6g of the material at room temperature, in vacuo over 1,84g/ml sulfuric acid o
36、r another desiccant, for24h. 8 Procedure 8.1 Carry out the test on two test portions of the dried sample (see clause 7). 8.2 Quickly transfer the dried extraction thimble (see6.3) from the desiccator (6.5) to the weighing bottle (6.6), close the weighing bottle with the stopper and weigh to the near
37、est1mg on the balance (6.2). Remove the stopper from the weighing bottle and place a test portion of approximately3g of the dried sample in the extraction thimble. Replace the stopper in the weighing bottle and weigh to the nearest1mg. Figure 1 Extraction apparatusENISO 308:1997 BSI 03-1999 3 NOTE 1
38、If it is desired to know the mass of the empty extraction thimble or to avoid repeating the test in case of breakage, the weighing bottle may be tared or may be weighed separately. 8.3 After folding over the extraction thimble or closing it with a loose plug of absorbent cotton wool, so that none of
39、 the material can float out, place it in the siphon tube of the extraction apparatus (6.3). Assemble the condenser, siphon tube and flask to which100ml of acetone (5.1) has been added. 8.4 Regulate the heating so that siphoning takes place at a rate of15to30times per hour, and continue the extractio
40、n for16h 0,5h. At the end of this time, dry the extraction thimble and contents at room temperature, in vacuo over 1,84g/ml sulfuric acid or another desiccant, for24h1h and then weigh in the same weighing bottle to the nearest1mg. 9 Expression of results The amount of acetone-soluble matter in the s
41、ample (apparent amount of resin in the unmoulded material) expressed as a percentage by mass is given by the formula where Take the arithmetic mean of the values obtained from the two test portions as the apparent amount of resin in the material under test, provided that these values do not differ b
42、y more than2,0% (in absolute value). 10 Test report The test report shall contain the following particulars: a) a reference to this International Standard; b) all details necessary for complete identification of the sample; c) the method used to reduce the material to a finely divided state; d) the
43、apparent amount of resin in each test portion; e) the arithmetic mean of the values obtained from the two test portions; f) the date of the test. m 0 is the mass, in grams, of the extraction thimble and weighing bottle; m 1 is the mass, in grams, of the extraction thimble weighing bottle and test po
44、rtion before extraction; m 2 is the mass, in grams, of the extraction thimble, weighing bottle and test portion after extraction. m 1 m 2 m 1 m 0 - 100BS EN ISO 308:1998 BS 2782-4-451C: 1998 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body
45、responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest ame
46、ndments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be f
47、ound on the inside front cover. Tel:02089969000. Fax:02089967400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications
48、 should be addressed to Customer Services. Tel:02089969001. Fax:02089967001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as BritishStandards, unless otherwise requested. Information on standards BSI provides a
49、 wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel:02089967111. Fax:02089967048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and
