1、November 2014Translation by DIN-Sprachendienst.English price group 7No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS
2、 83.080.10!%$“2270191www.din.deDDIN EN ISO 4895Plastics Liquid epoxy resins Determination of tendency to crystallize (ISO 4895:2014);English version EN ISO 4895:2014,English translation of DIN EN ISO 4895:2014-11Kunststoffe Flssige Epoxidharze Bestimmung der Kristallisationsneigung (ISO 4895:2014);E
3、nglische Fassung EN ISO 4895:2014,Englische bersetzung von DIN EN ISO 4895:2014-11Plastiques Rsines poxydes liquides Dtermination de la tendance la cristallisation (ISO 4895:2014);Version anglaise EN ISO 4895:2014,Traduction anglaise de DIN EN ISO 4895:2014-11SupersedesDIN EN ISO 4895:1999-08www.beu
4、th.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 9 pages10.14 DIN EN ISO 4895:2014-11 2 A comma is used as the decimal marker. National foreword This document (EN ISO 4895:2014) has been prepared by Technical Committee ISO/TC 61 “Plastics” (Sec
5、retariat: SAC, China) in collaboration with Technical Committee CEN/TC 249 “Plastics” (Secretariat: NBN, Belgium). The responsible German body involved in its preparation was the DIN-Normenausschuss Kunststoffe (DIN Standards Committee Plastics), Working Committee NA 054-02-02 AA Faserverstrkte Kuns
6、tstoffe. The DIN Standards corresponding to the International Standards referred to in this document are as follows: For ISO 6353-2 and ISO 6353-3 there are no national standards available. Amendments This standard differs from DIN EN ISO 4895:1999-08 as follows: a) the normative reference to ISO 30
7、01 has been deleted; b) the standard has been editorially revised. Previous editions DIN EN ISO 4895: 1999-08 EN ISO 4895 July 2014 ICS 83.080.10 Supersedes EN ISO 4895:1999English Version Plastics - Liquid epoxy resins - Determination of tendency to crystallize (ISO 4895:2014) Plastiques - Rsines p
8、oxydes 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 members are bound to comply with the CEN/CENELEC Internal Regula
9、tions 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 application to the CEN-CENELEC Management Centre or to any CEN member
10、. 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 Management Centre has the same status as the official versions. CEN
11、 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, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, P
12、ortugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. CEN-CENELEC Management Centre: Avenue Marnix 17, 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 EEUROP
13、EAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMContents Page Foreword . 3 Introduction . 4 1 Scope . 5 2 Normative references. 5 3 Principle 5 4 Reagents . 5 5 Apparatus 5 6 Procedure 6 7 Expression of resul
14、ts . 7 8 Precision . 7 9 Test report . 7 2DIN EN ISO 4895:2014-11 EN ISO 4895:2014 (E) Foreword This document (EN ISO 4895:2014) has been prepared by Technical Committee ISO/TC 61 in collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN. This European S
15、tandard 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 standards shall be withdrawn at the latest by January 2015. Attention is drawn to the possibility that some of the elements
16、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 ISO 4895:1999. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following co
17、untries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
18、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 EN ISO 4895:2014 without any modification. “Plastics”3DIN EN ISO 4895:2014-11EN ISO 4895:2014 (E)IntroductionThe tendency
19、 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 indicate the tendency quantitatively by observa
20、tion and comparison, the tendency is therefore to express the results by observing, at intervals, the changes in fluidity and appearance of samples.4DIN EN ISO 4895:2014-11 EN ISO 4895:2014 (E) SAFETY STATEMENT Persons using this document should be familiar with normal laboratory practice, if applic
21、able. 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 appropriate safety and health practices and to ensure compliance with any regulatory requirements.1 ScopeThis International Standard specifie
22、s a method for determining the tendency of liquid epoxy resins to crystallize. The tendency to crystallize is determined by observing, at specified time intervals, changes in fluidity and the onset of crystallization.2 Normative referencesThe following documents, in whole or in part, are normatively
23、 referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 6353-2:1983, Reagents for chemical analysis Part 2: Specification
24、s First seriesISO 6353-3:1987, Reagents for chemical analysis Part 3: Specifications Second series3 PrincipleCalcium carbonate powder is mixed with the liquid epoxy resin dissolved in ethanol. The mixture is kept at a specified low temperature and observed at specified time intervals to compare the
25、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 Apparatus5.1 Refrigerator or cold enclosure, maintained at (10 2) C.5.2 Glass test tube, of capacity approximately 100 ml, 40 mm in diam
26、eter 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, accurate to 0,01g.5.6 Constant temperature room maintained at (23 5)C.5DIN EN ISO 4895:2014-11EN ISO 4895:2014 (E)6 Procedure6.1 Weigh 20 g of
27、liquid epoxy resin into the test tube (5.2).6.2 Stopper the test tube and place it in the oven (5.4) at (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 thoro
28、ughly with the glass rod for 2 min.6.4 Stopper the test tube again and place it in the vertical position 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 sta
29、rt at 9 am; to carry out first observation at 5 pm; to carry out second observation at 9 am (next day); 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 (
30、23 5) C in the constant temperature room (5.6), then place it in the horizontal position and leave it 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
31、 10 mm, record “b”. When the sample has completely solidified due to crystallization, record “c”.Figure 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 nu
32、mber of days which elapse to each stage of crystallization (see Figure 2).6DIN EN ISO 4895:2014-11 EN ISO 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 liq
33、uid epoxy resin to crystallize is expressed as the number of days which elapse until 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.Ho
34、wever, interlaboratory tests conducted in Japan have shown that this method is currently 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 results of the test;d) the date of the test;e) any deviation, by agreement or otherwise, from the specified procedure.7DIN EN ISO 4895:2014-11EN ISO 4895:2014 (E)
