SIST EN ISO 22088-1:2006

Plastics - Determination of resistance to environmental stress cracking (ESC) - Part 1: General guidance (ISO 22088-1:2006)

This part of ISO 22088 provides information and general guidance relevant to the selection of the test method to be used to determine environmental stress cracking (ESC). Part 2 describes a method in which a test specimen is subjected to a constant tensile load, while immersed in a stress cracking agent at a specified temperature. The time and/or stress at which the specimen breaks is recorded. Part 3 describes a method in which strips of plastic are subjected to a fixed flexural strain and exposed to a stress cracking agent for a predetermined period. Part 4 describes a method in which a hole of specified diameter is drilled in a specimen and an oversized steel ball or pin is inserted into the hole while the test specimen is brought into contact with a stress cracking agent. Part 5 describes a method in which a constant tensile deformation is applied to a specimen which is immersed in a stress cracking agent at a temperature selected for testing. Part 6 describes a method in which a slowly increasing strain is applied to a specimen immersed in a stress cracking agent. These methods are applicable to thermoplastic materials only. These are essentially ranking tests and are not intended to provide data to be used for design or performance prediction.

Kunststoffe - Bestimmung der Beständigkeit gegen umgebungsbedingte Spannungsrissbildung (ESC) - Teil 1: Allgemeine Anleitung (ISO 22088-1:2006)

1.1   Dieser Teil von ISO 22088 liefert die für die Auswahl des Prüfverfahrens relevanten Informationen und allgemeinen Anleitungen zur Bestimmung der umgebungs¬bedingten Spannungsrissbildung (ESC).
1.2   Teil 2 beschreibt ein Verfahren, bei dem ein Probekörper, während er bei festgelegter Temperatur in ein Spannungsrisse bewirkendes Medium eingetaucht ist, einer konstanten Zugbelastung ausgesetzt wird. Die Zeit und/oder Spannung, bei der der Probekörper bricht, werden/wird aufgezeichnet.
1.3   Teil 3 beschreibt ein Verfahren, bei dem Kunststoffstreifen unter konstanter Biegezugdehnung angeordnet und für eine zuvor festgelegte Zeitdauer einem Spannungsrisse bewirkenden Medium ausgesetzt sind.
1.4   Teil 4 beschreibt ein Verfahren, bei dem in den Probekörper ein Loch mit vorgegebenem Durchmesser gebohrt und eine Kugel oder ein Rundstift mit Übermaß in die Bohrung hineingedrückt wird, während der Probekörper mit einem Spannungsrisse bewirkenden Medium in Kontakt gebracht wird.
1.5   Teil 5 beschreibt ein Verfahren, bei dem auf einen Probekörper eine konstante Zugverformungskraft ausgeübt wird, während dieser bei einer für die Prüfung ausgewählten Temperatur in ein Spannungsrisse bewirkendes Medium eingetaucht ist.
1.6   Teil 6 beschreibt ein Verfahren, bei dem auf einen Probekörper eine langsame Dehnrate angewendet wird, während dieser in ein Spannungsrisse bewirkendes Medium eingetaucht ist.
1.7   Diese Verfahren sind nur auf thermoplastische Kunststoffmaterialien anwendbar.
1.8   Bei diesen Verfahren handelt es sich im Wesentlichen um Rangordnungsprüfungen, und sie sind nicht zur Lieferung von Daten vorgesehen, die für konstruktive Zwecke oder zur Vorhersage der Gebrauchs¬tauglichkeit anzuwenden sind.

Plastiques - Détermination de la fissuration sous contrainte dans un environnement donné (ESC) - Partie 1: Lignes directrices générales (ISO 22088-1:2006)

L'ISO 22088-1:2006 fournit des informations et des lignes directrices générales relatives à la sélection de la méthode d'essai utilisée pour la détermination de la fissuration sous contrainte dans un environnement donné (ESC).

Polimerni materiali - Določanje odpornosti proti napetostni koroziji (ESC) - 1. del: Splošna navodila (ISO 22088-1:2006)

General Information

• Status: Published
• Publication Date: 30-Nov-2006
• ICS: 83.080.01 - Plastics in general
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2006
• Due Date: 01-Dec-2006
• Completion Date: 01-Dec-2006
• Ref Project: EN ISO 22088-1:2006 - Plastics - Determination of resistance to environmental stress cracking (ESC) - Part 1: General guidance (ISO 22088-1:2006)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 22088-1:2006
01-december-2006
3ROLPHUQLPDWHULDOL'RORþDQMHRGSRUQRVWLSURWLQDSHWRVWQLNRUR]LML(6&GHO
6SORãQDQDYRGLOD,62
Plastics - Determination of resistance to environmental stress cracking (ESC) - Part 1:
General guidance (ISO 22088-1:2006)
Kunststoffe - Bestimmung der Beständigkeit gegen umgebungsbedingte
Spannungsrissbildung (ESC) - Teil 1: Allgemeine Anleitung (ISO 22088-1:2006)
Plastiques - Détermination de la fissuration sous contrainte dans un environnement
donné (ESC) - Partie 1: Lignes directrices générales (ISO 22088-1:2006)
Ta slovenski standard je istoveten z: EN ISO 22088-1:2006
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
SIST EN ISO 22088-1:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

EUROPEAN STANDARD
EN ISO 22088-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2006
ICS 83.080.01

English Version
Plastics - Determination of resistance to environmental stress
cracking (ESC) - Part 1: General guidance (ISO 22088-1:2006)
Plastiques - Détermination de la fissuration sous contrainte Kunststoffe - Bestimmung der Beständigkeit gegen
dans un environnement donné (ESC) - Partie 1: Lignes umgebungsbedingte Spannungsrissbildung (ESC) - Teil 1:
directrices générales (ISO 22088-1:2006) Allgemeine Anleitung (ISO 22088-1:2006)
This European Standard was approved by CEN on 21 July 2006.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 22088-1:2006: E
worldwide for CEN national Members.

---------------------- Page: 2 ----------------------

EN ISO 22088-1:2006 (E)





Foreword


This document (EN ISO 22088-1:2006) 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 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 February 2007, and conflicting national
standards shall be withdrawn at the latest by February 2007.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.


Endorsement notice

The text of ISO 22088-1:2006 has been approved by CEN as EN ISO 22088-1:2006 without any
modifications.

2

---------------------- Page: 3 ----------------------

INTERNATIONAL ISO
STANDARD 22088-1
First edition
2006-08-15


Plastics — Determination of resistance to
environmental stress cracking (ESC) —
Part 1:
General guidance
Plastiques — Détermination de la fissuration sous contrainte dans un
environnement donné (ESC) —
Partie 1: Lignes directrices générales





Reference number
ISO 22088-1:2006(E)
©
ISO 2006

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ISO 22088-1:2006(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.


©  ISO 2006
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland

ii © ISO 2006 – All rights reserved

---------------------- Page: 5 ----------------------

ISO 22088-1:2006(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Principles of the test. 2
5 Applicability of the test method . 3
6 Test specimen preparation . 3
7 Conditioning and test conditions. 3
7.1 Conditioning. 3
7.2 Test temperature. 3
7.3 Test medium. 4
Annex A (informative) Examples of test methods for various plastics . 5
Bibliography . 6

© ISO 2006 – All rights reserved iii

---------------------- Page: 6 ----------------------

ISO 22088-1:2006(E)
Foreword
ISO (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 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
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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 for identifying any or all such patent rights.
ISO 22088-1 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 6, Ageing,
chemical and environmental resistance.
ISO 22088 consists of the following parts, under the general title Plastics — Determination of resistance to
environmental stress cracking (ESC):
⎯ Part 1: General guidance
⎯ Part 2: Constant tensile load method (replacement of ISO 6252:1992)
⎯ Part 3: Bent strip method (replacement of ISO 4599:1986)
⎯ Part 4: Ball or pin impression method (replacement of ISO 4600:1992)
⎯ Part 5: Constant tensile deformation method (new test method)
⎯ Part 6: Slow strain rate method (new test method)
iv © ISO 2006 – All rights reserved

---------------------- Page: 7 ----------------------

ISO 22088-1:2006(E)
Introduction
When a plastic material is stressed or strained in air below its yield point, stress cracking can occur after a
period of time, which may be very long. These stresses may be internal or external, or a combination of both.
Simultaneous exposure to a chemical environment and stress or strain may result in a dramatic shortening of
the time to failure compared to that in an inert environment. The phenomenon is referred to as environmental
stress cracking (ESC) and is exhibited by many materials, including plastics. The permissible long-term stress
or strain may be reduced considerably by this phenomenon.
It is generally believed that ESC occurs via the following processes:
1) Formation of microvoids in specimens by microscopic stress concentrations after applying stress.
2) Formation and subsequent growth of macrovoids caused by the breakdown of intermolecular bonds
in intervoids that is produced by the action of a chemical environment, and formation of crazes which
are composed of interconnected voids and fibrils.
3) Growth of the crazes caused by the break-down of the fibrils due to the applied stress and contact
with a chemical environment.
4) Finally, a crack starts at the tip of the craze, leading to brittle failure.
The cracks may penetrate completely through the thickness of the material, separating it into two or more
pieces, or they may be arrested on reaching regions of lower stress or different material morphology.
The determination of ESC is complex because it is influenced by many parameters, including:
⎯ test specimen dimensions;
⎯ test specimen state (orientation, structure, internal stresses);
⎯ specimen preparation;
⎯ thermal history of specimen;
⎯ stress and strain;
⎯ temperature of test;
⎯ duration of test;
⎯ chemical environment;
⎯ method of application of stress and strain;
⎯ failure criterion.
By keeping all but one parameter constant, the relative influence of the variable parameter on ESC can be
assessed. The main objective of ESC measurements is to determine the relative effect of chemical media
exposure on plastics (test specimens and articles).
The measurements may also be used to evaluate the influence of the moulding conditions upon the quality of
an article when the failure mode corresponds to that obtained in actual service.
It is almost impossible, however, to establish any direct correlation between the results of short-duration ESC
measurements on test specimens and the actual service behaviour of articles, because the behaviour of the
latter is likely to be more complex than that of test specimens.
© ISO 2006 – All rights reserved v

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INTERNATIONAL STANDARD ISO 22088-1:2006(E)

Plastics — Determination of resistance to environmental stress
cracking (ESC) —
Part 1:
General guidance
1 Scope
1.1 This part of ISO 22088 provides information and general guidance relevant t
...

EUROPEAN STANDARD
DRAFT
prEN ISO 22088-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2004
ICS
English version
Plastics - Determination of resistance to environmental stress
cracking (ESC) - Part 1: General guidance (ISO/DIS 22088-
1:2004)
Plastiques - Détermination de la fissuration sous contrainte
dans un environnement donné (ESC) - Partie 1: Directives
générales (ISO/DIS 22088-1:2004)
This draft European Standard is submitted to CEN members for parallel enquiry. It has been drawn up by the Technical Committee
CEN/TC 249.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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 Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN ISO 22088-1:2004: E
worldwide for CEN national Members.

---------------------- Page: 1 ----------------------
prEN ISO 22088-1:2004 (E)




Foreword

This document (prEN ISO 22088-1:2004) 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 IBN.

This document is currently submitted to the parallel Enquiry.



Endorsement notice

The text of ISO 22088-1:2004 has been approved by CEN as prEN ISO 22088-1:2004 without
any modifications.

2

---------------------- Page: 2 ----------------------
DRAFT INTERNATIONAL STANDARD ISO/DIS 22088-1
ISO/TC 61/SC 6 Secretariat: DIN
Voting begins on: Voting terminates on:
2004-10-14 2005-03-14
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
Plastics — Determination of resistance to environmental stress
cracking (ESC) —
Part 1:
General guidance
Plastiques — Détermination de la fissuration sous contrainte dans un environnement donné (ESC) —
Partie 1: Directives générales
ICS 83.080.01

ISO/CEN PARALLEL ENQUIRY
The CEN Secretary-General has advised the ISO Secretary-General that this ISO/DIS covers a subject
of interest to European standardization. In accordance with the ISO-lead mode of collaboration as
defined in the Vienna Agreement, consultation on this ISO/DIS has the same effect for CEN
members as would a CEN enquiry on a draft European Standard. Should this draft be accepted, a
final draft, established on the basis of comments received, will be submitted to a parallel two-month FDIS
vote in ISO and formal vote in CEN.
In accordance with the provisions of Council Resolution 15/1993 this document is circulated in
the English language only.
Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est distribué
en version anglaise seulement.
To expedite distribution, this document is circulated as received from the committee secretariat.
ISO Central Secretariat work of editing and text composition will be undertaken at publication
stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
© International Organization for Standardization, 2004

---------------------- Page: 3 ----------------------
ISO/DIS 22088-1
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall
not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the
unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
under the applicable laws of the user's country, neither this ISO draft nor any extract from it may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, photocopying,
recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to either ISO at the address below or ISO's
member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
©
ii ISO 2004 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/DIS 22088-1
Contents
Foreword. iv
Introduction .1
1 Scope .2
2 Normative references .2
3 Terms and definitions.3
4 Principles of the test.3
5 Applicability of the test method .4
6 Test specimens preparation .4
7 Conditioning and test conditions.5
8 Test report .6
Annex A (informative)  Example of testing method and plastics .7
Bibliography .8
© ISO 2002 – All rights reserved iii
DRAFT 2004

---------------------- Page: 5 ----------------------
ISO/DIS 22088-1
Foreword
ISO (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 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
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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 for identifying any or all such patent rights.
International Standard ISO 22088-1 was prepared by Technical Committee ISO/TC 61, Plastics,
Subcommittee SC 6, Ageing, chemical and environmental resistance.
ISO 22088 consists of the following parts, under the general title Plastics – Determination of resistance to
environmental stress cracking (ESC):
 Part 1: General guidance:
 Part 2: Constant tensile stress method       (replacement for ISO 6252)
 Part 3: Bent strip method             (replacement for ISO 4599)
 Part 4: Ball or pin impression method        (replacement for ISO 4600)
 Part 5: Constant tensile deformation method     (new test method)
 Part 6: Slow strain rate method           (new test method)
iv © ISO 2002 – All rights reserved
DRAFT 2004

---------------------- Page: 6 ----------------------
DRAFT INTERNATIONAL STANDARD ISO/DIS 22088-1
Plastics — Determination of resistance to environmental stress
cracking (ESC) — Part 1: General guidance
Introduction
When a plastic material is stressed or strained in air below its yield point, stress cracking can occur after a
period of time, which may be very long. These stresses may be internal or external, or a combination of both.
Simultaneous exposure to a chemical environment with the same stress or strain may result in a dramatic
shortening of the time to failure. This phenomenon is referred to as environmental stress cracking (ESC). ESC
is exhibited by many materials, including plastics. The permissible long-term stress or strain may be reduced
considerably by this phenomenon.
It is generally believed that ESC occurs via the following processes.
1. Formation of microvoids in specimens by microscopic stress concentration after applying stress.
2. Formation and subsequent growth of macrovoids caused by the breakdown of intermolecular bonds in
intervoids that is produced by the action of a chemical environment, and formation of crazes which are
composed of interconnected voids and fibrils.
3. Growth of the craze caused by the break-down of molecule in the fibrils, by applying stress and contacting
with a chemical environment.
4. Finally, a crack starts at the tip of the craze, leading to brittle failure.
The produced cracks may penetrate completely through the thickness of the material, separating it into two or
more pieces, or they may be arrested on reaching regions of lower stress or different material morphology.
The determination of ESC is complex because it is influenced by many parameters, including;
- test specimen dimensions;
- test specimen state (orientation, structure, internal stresses);
- specimen preparation
- heat history of specimen
- stress and strain;
- temperature of test;
- duration of test;
- chemical environment;
- test method;
- failure criterion.
By keeping all but one parameter constant, the influence of the variable parameter on ESC can be assessed.
The main objective of ESC measurements is to determine the effect of chemical media (environment) on
plastics (test specimens and articles).
The measurements may also be used to evaluate the influence of the moulding conditions upon the quality of
an article when the failure mode corresponds to that obtained in actual service.
It is almost impossible, however, to establish any direct correlation between the results of short-duration ESC
measurements on test specimens and the actual service behaviour of articles, because the behaviour of the
latter is likely to be more complex than that of test specimens.
© ISO 2002 – All rights reserved 1
DRAFT 2004

---------------------- Page: 7 ----------------------
ISO/DIS 22088-1
1 Scope
1.1 This part of ISO 22088 provides information and general guidance relevant to the selection of the testing
method for ESC.
1.2 Part 2 describes a constant tensile stress method in which a test specimen is subjected to a constant
tensile force, while immersed in a specified environment at the temperature selected for testing. The time
and/or stress at which the specimen breaks are recorded.
1.3 Part 3 describes a bent strip method. In this test, strips of a plastic are positioned in a fixed flexural strain
and exposed to a stress cracking agent for a predetermined period.
1.4 Part 4 describes a ball or pin impression method. In this test, a hole of specified diameter is drilled in the
specimen. An oversized steel ball or pin is inserted into the hole and the test specimen is brought into contact
with a test medium.
1.5 Part 5 describes a constant tensile deformation method. In this test, a specimen is fixed at a constant
deformation while immersed in a specified test medium at a temperature selected for testing. The critical
stress is obtained.
1.6 Part 6 describes the procedure for assessing the environment stress cracking susceptibility of polymeric
materials in test mediums using the slow strain rate technique.
1.7 These methods are applicable to thermoplastic materials only.
2 Normative references
The following referenced documents are indis
...