Plastics - Liquid epoxy resins - Determination of tendency to crystallize (ISO 4895:1997)

Kunststoffe - Flüssige Epoxidharze - Bestimmung der Kristallisationsneigung (ISO 4895:1997)

Diese Internationale Norm legt ein Verfahren zur Bestimmung der Kristallisationsneigung flüssiger Epoxidharze fest. Die Kristallisationsneigung wird bestimmt, indem man in bestimmten Zeitintervallen Änderungen in der Fluidität und den Begin der Kristallisation beobachtet.

Plastiques - Résines époxydes liquides - Détermination de la tendance à la cristallisation (ISO 4895:1997)

Polimerni materiali - Tekoče epoksidne smole - Določanje nagnjenosti h kristalizaciji (ISO 4895:1997)

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kunststoffe - Flüssige Epoxidharze - Bestimmung der Kristallisationsneigung (ISO 4895:1997)Plastiques - Résines époxydes liquides - Détermination de la tendance a la cristallisation (ISO 4895:1997)Plastics - Liquid epoxy resins - Determination of tendency to crystallize (ISO 4895:1997)83.080.10DuromeriThermosetting materialsICS:Ta slovenski standard je istoveten z:EN ISO 4895:1999SIST EN ISO 4895:2000en01-maj-2000SIST EN ISO 4895:2000SLOVENSKI

SIST EN ISO 4895:2000

SIST EN ISO 4895:2000

SIST EN ISO 4895:2000

SIST EN ISO 4895:2000

SIST EN ISO 4895:2000

AReference numberISO 4895:1997(E)INTERNATIONALSTANDARDISO4895Second edition1997-11-15Plastics — Liquid epoxy resins —Determination of tendency to crystallizePlastiques — Résines époxydes liquides — Détermination de la tendanceà la cristallisationSIST EN ISO 4895:2000

ISO 4895:1997(E)©
ISO 1997All rights reserved. Unless otherwise specified, no part of this publication may be reproducedor utilized in any form or by any means, electronic or mechanical, including photocopying andmicrofilm, without permission in writing from the publisher.International Organization for StandardizationCase postale 56 · CH-1211 Genève 20 · SwitzerlandInternetcentral@iso.chX.400c=ch; a=400net; p=iso; o=isocs; s=centralPrinted in SwitzerlandiiForewordISO (the International Organization for Standardization) is a worldwidefederation of national standards bodies (ISO member bodies). The work ofpreparing International Standards is normally carried out through ISOtechnical committees. Each member body interested in a subject for whicha technical committee has been established has the right to be representedon that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISOcollaborates closely with the International Electrotechnical Commission(IEC) on all matters of electrotechnical standardization.Draft International Standards adopted by the technical committees arecirculated to the member bodies for voting. Publication as an InternationalStandard requires approval by at least 75 % of the member bodies castinga vote.International Standard ISO 4895 was prepared by Technical CommitteeISO/TC 61, Plastics, Subcommittee SC 12, Thermosetting materials.This second edition cancels and replaces the first edition (ISO 4895:1987),which has been technically revised.SIST EN ISO 4895:2000

© ISOISO 4895:1997(E)iiiIntroductionThe tendency of liquid epoxy resins to crystallize varies depending onfactors such as basic composition, purity, additives, homogeneity andwater content, in addition to external factors such as storage historyand ambient temperature.As it is rather difficult to indicate the tendency quantitatively by observationand comparison, the tendency is therefore to express the results byobserving, at intervals, the changes in fluidity and appearance of samples.SIST EN ISO 4895:2000

SIST EN ISO 4895:2000

© ISOISO 4895:1997(E)1Plastics — Liquid epoxy resins — Determination oftendency to crystallize1
ScopeThis International Standard specifies a method for determining the tendency of liquid epoxy resins to crystallize. Thetendency to crystallize is determined by observing, at specified time intervals, changes in fluidity and the onset ofcrystallization.2
Normative referencesThe following standards contain provisions which, through reference in this text, constitute provisions of thisInternational Standard. At the time of publication, the editions indicated were valid. All standards are subject torevision, and parties to agreements based on this International Standard are encouraged to investigate thepossibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintainregisters of currently valid International Standards.ISO 3001:1997, Plastics — Epoxy compounds — Determination of epoxy equivalent.ISO 6353-2:1983, Reagents for chemical analysis — Part 2: Specifications — First series.ISO 6353-3:1987, Reagents for chemical analysis — Part 3: Specifications — Second series.3
PrincipleCalcium carbonate powder is mixed with the liquid epoxy resin dissolved in ethanol. The mixture is kept at aspecified low temperature and observed at specified time intervals to compare the changes in fluidity andcrystallization.4
Calcium carbonate, as specified in ISO 6353-3:1987, R 53.4.2
Ethanol, as specified in ISO 6353-2:1983, R 11.SIST EN ISO 4895:2000

ISO 4895:1997(E)© ISO25
Refrigerator or cold enclosure, maintained at 10 °C ± 2 °C.5.2
Glass test tube, of capacity approximately 100 ml, 40 mm in diameter and 80 mm in height, with apolyethylene-covered stopper.5.3
Glass rod, of hard glass, approximately 10 mm in diameter.5.4
Analytical balance.6
Weigh 20 g of liquid epoxy resin into the tes

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