EN ISO 4895:2014

Plastics - Liquid epoxy resins - Determination of tendency to crystallize (ISO 4895:2014)

ISO 4895:2014 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, changes in fluidity and the onset of crystallization.

Kunststoffe - Flüssige Epoxidharze - Bestimmung der Kristallisationsneigung (ISO 4895:2014)

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

Plastiques - Résines époxydes liquides - Détermination de la tendance à la cristallisation (ISO 4895:2014)

L'ISO 4895:2014 spécifie une méthode de détermination de la tendance à la cristallisation des résines époxy liquides. Cette tendance à cristalliser se détermine par observation, à intervalles de temps donnés, des variations de la fluidité et d'apparition de la cristallisation.

Polimerni materiali - Tekoče epoksidne smole - Ugotavljanje nagnjenosti h kristalizaciji (ISO 4895:2014)

Ta mednarodni standard določa postopek ugotavljanja nagnjenosti tekočih epoksidnih smol h kristalizaciji. Nagnjenost h kristalizaciji se določi z opazovanjem sprememb v fluidnosti in opazovanjem nastanka kristalizacije v določenih časovnih intervalih.

General Information

• Status: Published
• Publication Date: 15-Jul-2014
• Withdrawal Date: 30-Jan-2015
• ICS: 83.080.10 - Thermosetting materials
• Technical Committee: CEN/TC 249 - Plastics
• Drafting Committee: CEN/TC 249 - Plastics
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 16-Jul-2014
• Completion Date: 16-Jul-2014
• Ref Project: SIST EN ISO 4895:2014 - Plastics - Liquid epoxy resins - Determination of tendency to crystallize (ISO 4895:2014)

Relations

• Replaces: EN ISO 4895:1999 - Plastics - Liquid epoxy resins - Determination of tendency to crystallize (ISO 4895:1997)
• Effective Date: 23-Jul-2014

Overview

EN ISO 4895:2014 - Plastics: Liquid epoxy resins - Determination of tendency to crystallize specifies a laboratory method to assess the tendency of liquid epoxy resins to crystallize. The test quantifies how long a resin takes to show reduced fluidity and the onset of crystallization by periodic observation under controlled conditions. Results are reported as the number of days to reach defined stages of solidification.

Key topics and technical requirements

• Scope: Determines crystallization tendency by observing changes in fluidity and appearance at specified intervals.
• Principle: Mix resin with calcium carbonate and ethanol, condition at low temperature, and monitor fluid movement and solidification.
• Reagents:
  • Calcium carbonate (per ISO 6353-3:1987, R 53)
  • Ethanol (per ISO 6353-2:1983, R 11)
• Apparatus: Refrigerator or cold enclosure at (10 ± 2) °C, test tube (100 ml, 40 mm × 80 mm) with stopper, hard glass rod (10 mm diameter), oven, analytical balance (0.01 g), and constant temperature room (23 ± 5) °C.
• Procedure (summary):
  • Weigh 20 g liquid epoxy resin into test tube.
  • Dry in oven at (60 ± 2) °C for 16 h.
  • Cool to (23 ± 5) °C, add 20 g CaCO3 and 2 g ethanol, mix 2 min.
  • Store vertically at (10 ± 2) °C.
  • Observe twice daily (example schedule: start 09:00; first observation 17:00; then 09:00 next day, etc.). For each observation warm to 23 ±5 °C, place tube horizontally 1 min and record:
    • a: liquid tip movement L ≥ 10 mm
    • b: L < 10 mm
    • c: completely solidified (crystallized)
  • If not crystallized, remix and return to cold storage.
• Expression of results: Number of days elapsed to reach stages a, b, and c.
• Precision: No fixed precision value (tendency-based). Interlaboratory trials in Japan indicated improved reliability and environmental acceptability over previous editions.
• Safety: Follow normal laboratory practices.

Applications

• Quality control and acceptance testing of liquid epoxy resins.
• Shelf-life and storage stability assessment for formulation selection.
• Supplier qualification and incoming material inspection.
• R&D when evaluating effects of formulation, purity, additives or water content on crystallization tendency.
• Logistics and handling decisions to prevent unwanted crystallization during transport or storage.

Who should use this standard

• Epoxy resin manufacturers and formulators
• QC/analytical laboratories in plastics and composites industry
• R&D teams developing thermosetting materials
• Procurement and materials engineers responsible for supplier acceptance

Related standards

• ISO 6353-2:1983 (reagents - ethanol specification)
• ISO 6353-3:1987 (reagents - calcium carbonate specification)
• EN ISO 4895:2014 supersedes earlier EN ISO 4895 editions (e.g., 1999)

Keywords: EN ISO 4895:2014, ISO 4895, liquid epoxy resins, crystallization tendency, epoxy resin testing, storage stability, quality control.

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2014
1DGRPHãþD
SIST EN ISO 4895:2000
3ROLPHUQLPDWHULDOL7HNRþHHSRNVLGQHVPROH8JRWDYOMDQMHQDJQMHQRVWLK
NULVWDOL]DFLML,62
Plastics - Liquid epoxy resins - Determination of tendency to crystallize (ISO 4895:2014)
Kunststoffe - Flüssige Epoxidharze - Bestimmung der Kristallisationsneigung (ISO
4895:2014)
Plastiques - Résines époxydes liquides - Détermination de la tendance à la cristallisation
(ISO 4895:2014)
Ta slovenski standard je istoveten z: EN ISO 4895:2014
ICS:
83.080.10 Duromeri Thermosetting materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 4895
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2014
ICS 83.080.10 Supersedes EN ISO 4895:1999
English Version
Plastics - Liquid epoxy resins - Determination of tendency to
crystallize (ISO 4895:2014)
Plastiques - Résines époxydes liquides - Détermination de Kunststoffe - Flüssige Epoxidharze - Bestimmung der
la tendance à la cristallisation (ISO 4895:2014) 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 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 application 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 Management 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, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4895:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
This document (EN ISO 4895:2014) has been prepared by Technical Committee ISO/TC 61 "Plastics" 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 standards 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 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 Macedonia, 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 EN ISO 4895:2014 without any modification.
INTERNATIONAL ISO
STANDARD 4895
Third edition
2014-07-15
Plastics — Liquid epoxy resins
— Determination of tendency to
crystallize
Plastiques — Résines époxydes liquides — Détermination de la
tendance à la cristallisation
Reference number
ISO 4895:2014(E)
©
ISO 2014
ISO 4895:2014(E)
© ISO 2014
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
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ii © ISO 2014 – All rights reserved

ISO 4895:2014(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Reagents . 1
5 Apparatus . 1
6 Procedure. 2
7 Expression of results . 3
8 Precision . 3
9 Test report .
...