1、BSI Standards PublicationBS EN ISO 4895:2014Plastics Liquid epoxy resins Determination of tendencyto crystallizeBS EN ISO 4895:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 4895:2014.It supersedes BS EN ISO 4895:1999 which is withdrawn.The UK particip
2、ation in its preparation was entrusted to TechnicalCommittee PRI/42, Fibre reinforced thermosetting plastics andprepregs.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a cont
3、ract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 81809 7ICS 83.080.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the autho
4、rity of theStandards Policy and Strategy Committee on 31 July 2014.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 4895 July 2014 ICS 83.080.10 Supersedes EN ISO 4895:1999English Version Plastics - Liquid epoxy resins - Determination of t
5、endency to crystallize (ISO 4895:2014) Plastiques - Rsines poxydes liquides - Dtermination de la tendance la cristallisation (ISO 4895:2014) Kunststoffe - Flssige Epoxidharze - Bestimmung der Kristallisationsneigung (ISO 4895:2014) This European Standard was approved by CEN on 28 June 2014. CEN memb
6、ers are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions 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 applicati
7、on to the CEN-CENELEC Management Centre 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 the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Managem
8、ent Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
9、Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 1
10、7, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 4895:2014 EBS EN ISO 4895:2014EN ISO 4895:2014 (E) 3 Foreword This document (EN ISO 4895:2014) has been prepared by Technical Committee ISO/TC 61 “Plastics
11、“ in collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN. 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 January 2015, and conflicting national st
12、andards shall be withdrawn at the latest by January 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN
13、ISO 4895:1999. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedon
14、ia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 4895:2014 has been approved by CEN as
15、 EN ISO 4895:2014 without any modification. BS EN ISO 4895:2014ISO 4895:2014(E) ISO 2014 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Principle 14 Reagents 15 Apparatus . 16 Procedure. 27 Expression of results 38 Precision . 39 Test report . 3BS E
16、N ISO 4895:2014ISO 4895:2014(E)ForewordISO (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 interes
17、ted 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-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical C
18、ommission (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 ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO document
19、s 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 possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible f
20、or 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 patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the
21、convenience of users 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: Fore
22、word - Supplementary informationThe committee responsible for this document is ISO/TC 61, Plastics, Subcommittee SC 12, Thermosetting materials.This third edition cancels and replaces the second edition (ISO 4895:1997), which has been technically revised.iv ISO 2014 All rights reservedBS EN ISO 4895
23、:2014ISO 4895:2014(E)IntroductionThe tendency of liquid epoxy resins to crystallize varies depending on factors such as basic composition, purity, additives, homogeneity and water content, in addition to external factors such as storage history and ambient temperature.As it is rather difficult to in
24、dicate the tendency quantitatively by observation and comparison, the tendency is therefore to express the results by observing, at intervals, the changes in fluidity and appearance of samples. ISO 2014 All rights reserved vBS EN ISO 4895:2014BS EN ISO 4895:2014Plastics Liquid epoxy resins Determina
25、tion of tendency to crystallizeSAFETY STATEMENT Persons using this document should be familiar with normal laboratory practice, if applicable. This document does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user to establish appr
26、opriate safety and health practices and to ensure compliance with any regulatory requirements.1 ScopeThis International Standard specifies a method for determining the tendency of liquid epoxy resins to crystallize. The tendency to crystallize is determined by observing, at specified time intervals,
27、 changes in fluidity and the onset of crystallization.2 Normative referencesThe 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 cited applies. For undated references, the latest ed
28、ition of the referenced document (including any amendments) applies.ISO 6353-2:1983, Reagents for chemical analysis Part 2: Specifications First seriesISO 6353-3:1987, Reagents for chemical analysis Part 3: Specifications Second series3 PrincipleCalcium carbonate powder is mixed with the liquid epox
29、y resin dissolved in ethanol. The mixture is kept at a specified low temperature and observed at specified time intervals to compare the changes in fluidity and crystallization.4 Reagents4.1 Calcium carbonate, as specified in ISO 6353-3:1987, R 53.4.2 Ethanol, as specified in ISO 6353-2:1983, R 11.5
30、 Apparatus5.1 Refrigerator or cold enclosure, maintained at (10 2) C.5.2 Glass test tube, of capacity approximately 100 ml, 40 mm in diameter and 80 mm in height, with a polyethylene-covered stopper.5.3 Glass rod, of hard glass, approximately 10 mm in diameter.5.4 Oven.5.5 Analytical balance, accura
31、te to 0,01g.INTERNATIONAL STANDARD ISO 4895:2014(E) ISO 2014 All rights reserved 1BS EN ISO 4895:2014ISO 4895:2014(E)5.6 Constant temperature room maintained at (23 5)C.6 Procedure6.1 Weigh 20 g of liquid epoxy resin into the test tube (5.2).6.2 Stopper the test tube and place it in the oven (5.4) a
32、t (60 2) C for 16 h.6.3 Cool the test tube to room temperature (23 5) C in the constant temperature room (5.6), add 20 g of calcium carbonate (4.1) and 2 g of ethanol (4.2), and mix the sample thoroughly with the glass rod for 2 min.6.4 Stopper the test tube again and place it in the vertical positi
33、on in the refrigerator or cold enclosure (5.1) at (10 2) C.6.5 Observe the sample twice a day at a specified time (for example at an interval of 8 h during the day and 16 h during the night): to start at 9 am; to carry out first observation at 5 pm; to carry out second observation at 9 am (next day)
34、; to carry out third observation at 5 pm (next day); to carry out fourth observation at 9 am (the day after).Observe the sample in the following way.Allow the test tube to warm to room temperature (23 5) C in the constant temperature room (5.6), then place it in the horizontal position and leave it
35、for 1 min. When the distance of movement of the liquid surface tip (L in Figure 1) is 10 mm and more, record “a”. When the distance of movement of the liquid surface tip (L in Figure 1) is less than 10 mm, record “b”. When the sample has completely solidified due to crystallization, record “c”.Figur
36、e 1 Observation of samplesAfter each observation, if the sample has not yet crystallized, mix thoroughly with the glass rod for 2 min and place into refrigerator until next observation.Record the number of days which elapse to each stage of crystallization (see Figure 2).2 ISO 2014 All rights reserv
37、edBS EN ISO 4895:2014ISO 4895:2014(E)KeyAn arrow indicates the time when the test was discontinued because of no further change.Figure 2 Results of the interlaboratory tests7 Expression of resultsThe tendency of a liquid epoxy resin to crystallize is expressed as the number of days which elapse unti
38、l each stage specified in 6.5, “a”, “b” and “c”, is reached.8 PrecisionPrecision in the generally accepted sense of the term for test methods cannot be determined here since it is a tendency which is being assessed.However, interlaboratory tests conducted in Japan have shown that this method is curr
39、ently more reliable and environmentally more acceptable than the previous edition (ISO 4895:1987).9 Test reportThe test report shall include the following particulars:a) a reference to this International Standard, i.e. ISO 4895;b) all details necessary for identification of the sample tested;c) the
40、results of the test;d) the date of the test;e) any deviation, by agreement or otherwise, from the specified procedure. ISO 2014 All rights reserved 3This page deliberately left blankThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standa
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