1、STD.BSI BS EN IS0 308-ENGL 1998 m lb24bb9 Ob72 BRITISH STANDARD Plastics - Phenolic moulding materials - Determination of acetone-soluble matter (apparent resin content of material in the unmoulded state) The European Standard EN IS0 308 : 1997 has the status of a British Standard ICs 83.080.10 NO C
2、OPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW 30 700 m BS EN IS0 308 : 1998 BS 2782-4-451C : 1998 STD-BSI BS EN IS0 308-ENGL 1778 = lb2Libb7 Ob72732 b47 direction of the Sector Board for Materiais and Chemicals, was published under the authority of the Standards Boani and comes
3、into effect on 15 January 1998 hd. No. BS EN IS0 308 : 1998 Da Text affected National foreword This British Standard is the Enghsh language version of EN IS0 308 : 1997. It is identical with IS0 308 : 1994. It supersedes BS 2782 : Part 4 : Method 451C : 1978 which is withdrawn. The UK participation
4、in its preparation was entrusted to Technical Committee PRIM, Testing of plastics, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible intermtionallEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK inter
5、ests informed; - monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include a
6、n annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled International Standards Cor
7、respondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a hnt cover, an inside front cover, the EN IS0 titJe page, the EN Is0 for
8、eword page, the Is0 title page, page ii, pages 1 to 3, a blank page, an inside back cover and a back cover. O BSI 1998 I I ISBN O 580 28877 3 STD-BSI BS EN IS0 308-ENGL 1998 PII Lb24bb9 Ob72732 583 W EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 308 November 1997 ICs 83.080.10 Descriptors
9、: see IS0 document English version Plastics - Phenolic moulding materials - Determination of acetone-soluble matter (apparent resin content of material in the unmoulded state) (IS0 308: 1 994) Plastiques - Matibres B mouler h base de phhoplasies - b81ermination des matires solubles dans lac6tone (te
10、neur apparente en rsine des mallbres B ltat non moul) (IS0 308:1994) Kunststoffe - Phenolharz-Formmassen - Bestimmung des acetonloslichen Anteils (Scheinbarer Hangehalt von Formmassen in unverattmitetem Zustand) (IS0 308:lW) This European Standard was approved by CEN on 16 Ociober 1997. CEN members
11、are bound to comply wiih the CENICENELEC Internal Regulations which stipulate the conditiions for giving this European Standard the status af a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application
12、to the Central Secretarial or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under lhe responsibility af a CEN member into ils own language and notified lo the Central Secreiariat has the same
13、 status as the otficial versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Swiizetiand and United Kingdom. EUROPEAN COMMITIEE FOR ST
14、ANDARDUTION COMITE EUROPEEN DE NORMALISATION EUROPISCHES KOMITEE FOR NORMUNG Centrai Secretariat: rue de Stasurt, 38 8-1054 Bruarelr Q 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN IS0 308:1997 E - - STD-BSI BS EN IS0 308-EN
15、GL 1998 S lb2Libb9 Ob72733 LILT D EN IS0 308 : 1997 Foreword The text of the International Standard from Technical Committee ISO/TC 61 “Plastics“ of the International Organization for Standardization (ISO) has been taken over as an European Standard by Technical Committee CEN/TC 249 “Plastics“, the
16、secretariat of which is held by IBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 1998, and conflicting ti01 standards shall be withdrawn at the latest by May 1998. According to the CENKENE
17、LEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Swi
18、tzerland and the United Kingdom. Endorsement notice The text of the International Standard IS0 308:1994 has been approved by CEN as a European Standard without any modification. * rn * STD.BS1 BS EN IS0 308-ENGL -1998 lb24bb Ob72734 35b EN IS0 308 : 1997 I NTER NAT I O NA L STANDARD IS0 Third editio
19、n 1994-1 0-01 Plastics - Phenolic moulding materials - Determination of acetone-soluble matter (apparent resin content of material in the unmoulded state) Plastiques - Matires mouler base de phnoplastes - Dtermination des matires solubles dans lactone (teneur apparente en rsine des matires ltat non
20、moul) Reference number IS0 308:1994(E) STD.BS1 BS EN IS0 308-ENGL i778 Lb2Vbb Ob72735 272 EN IS0 308 : 1997 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is n
21、ormally carried out through IS0 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 nongovernmental, in liaison with ISO, also take part in
22、 the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard
23、requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 308 was prepared by Technical Committee iSO/TC 61, Plastics, Subcommittee SC 12, Thermosetting materials. This third edition cancels and replaces the second edition (IS0 308:1981), of which it constitu
24、tes a minor revision. D.wripton: plastics. Phenoplasts, moulding materials, chemical analysis, determination of content, resins, soluble matter, acetone, gravimetric analysis. ii STD.BSI BS EN IS0 308-ENGL 1998 1111 Lb24bb9 Ob7273b 129 EN IS0 308 : 1997 Plastics - Phenolic moulding materials - Deter
25、mination of acetone-soluble matter (apparent resin content of material in the unmoulded state) 1 Scope 3 Definitions 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, fro
26、m a sample of finely divided phenolic 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 mat
27、ter is reported as the apparent resin con- phenolic resin and hexamine, other acetone-soluble components such as lubricants and colorants or na- tural resins from the filler are normally also present and will therefore be reported as resin. - - - e - E It * v, tent because, although the extract cons
28、ists mainly of For the purposes of this International Standard, the definitions of moulding materials based on phenolic resins, novolak resins and resol resins given in IS0 472 and IS0 800 apply. 4 Principle The acetone-soluble matter is extracted, using hot acetone, from a finely divided test porti
29、on. The extract is 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. 2 Normative references 6.2 Balance, accurate to 1 mg. The following standards contain provisions which, through
30、 reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of apply
31、ing the most re- cent editions of the standards indicated below. Members of IEC and IS0 maintain registers of cur- rently valid International Standards. IS0 472:1988, Plastics - Vocabulary. IS0 800: 1992, Plastics - Phenolic moulding ma- terials - Specification. 6.3 Extraction apparatus, of the type
32、 shown in figure 1, (A glass filter crucible may be used instead 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 matt
33、er, shall be dried for 2 h in the oven (6.4) at approximately 105 “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 1 STD.BSI BS E
34、N IS0 308-ENGL 1778 Lb24bb Ob72737 Ob5 = EN IS0 308 : 1997 point. Any other extraction apparatus may be used, provided that it can be shown to give similar results. 6.6 Weighing bottle, with ground-glass stopper. 7 Preparation of sample 7.1 Take a fully representative sample of the moulding material
35、. If the material is in the form of 6.4 Drying oven, capable of being maintained at approximately 105 “C. 6.5 Desiccator. c f preform;, flakes, coarse pieces or sheet (felted, ori- ented or woven), reduce it to powder or small pieces using the reduction device (6.1 1 before the test, taking care to
36、avoid overheating. The thickness of the parti- cles obtained shall-not exceed 1.5 mm and their other dimensions shall not exceed 5 mm. The sample Dimensions in millimetres esistont Figure 1 - Extraction apparatus 2 STD.BS1 BS EN IS0 308-ENGL should not be ground too finely or it may tend to ag- glom
37、erate in the extraction thimble. Take care that no resin is lost while the sample is being reduced to powder or small pieces. 7.2 Dry at least 6 g of the material at room tem- perature, in vacuo over p 1,84 g/mi sulfuric acid or another desiccant, for 24 h. 8 Procedure 8.1 dried sample (see clause 7
38、). Carry out the test on two test portions of the 8.2 Quickly transfer the dried extraction thimble (see 6.3) from the desiccator (6.5) to the weighing bottle (6.61, close the weighing bottle with the stopper and weigh to the nearest 1 mg on the balance (6.2). Remove the stopper from the weighing bo
39、ttle and place a test portion of approximately 3 g of the dried sample in the extraction thimble. Replace the stopper in the weighing bottle and weigh to the nearest 1 mg. NOTE 1 if it is desired to know the mass of the empty extraction thimble or to avoid repeating the test in case of breakage, the
40、 weighing bottle may be tared or may be weighed separately. - = _I E - w * 8.3 After folding over the extraction thimble or closing it with a loose plug of absorbent cotton wool, so that none of the material can float out, place it in the siphon tube of the extraction apparatus (6.3). As- semble the
41、 condenser, siphon tube and flask to which 1 O0 ml of acetone (5.1) has been added. v1 * 8.4 Regulate the heating so that siphoning takes place at a rate of 15 to 30 times per hour, and con- tinue the extraction for 16 h f 0,5 h. At the end of this time, dry the extraction thimble and contents at ro
42、om temperature, in vacuo over p 1.84 g/ml sulfuric acid or another desiccant, for 24 h f 1 h and then weigh in the same weighing bottle to the nearest 1 mg. 1998 M Lb2qbb b72738 TTL EN IS0 308 : 1997 9 Expression of results The amount of acetone-soluble matter in the sample (apparent amount of resin
43、 in the unmoulded material) expressed as a percentage by mass is given by the formula ml -m, x 100 m1 - mo where m, is the mass, in grams, of the extraction thimble and weighing bottle; is the mass, in grams, of the extraction thimble weighing bottle and test portion before extraction; m, m, is the
44、mass, in grams, of the extraction thimble, weighing bottle and test portion after extraction. 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 by more than 2.0 % (in absolut
45、e value). 10 Test report The test report shall contain the following particulars: a reference to this International Standard; all details necessary for complete identification of the sample; the method used to reduce the material to a finely divided state; the apparent amount of resin in each test p
46、ortion; the arithmetic mean of the values obtained from the two test portions; the date of the test. 3 STD-BSI BS EN IS0 308-ENGL 1978 m LbZibbS Ob72737 738 m BS EN IS0 308 : 1998 BS 2782-4-451C : 1998 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independen
47、t nationai body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Contract requirements A British Standard does not purport to include all the necessary provisions of a contract. Users of B
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