EN ISO 22088-1:2006
(Main)Plastics - Determination of resistance to environmental stress cracking (ESC) - Part 1: General guidance (ISO 22088-1:2006)
Plastics - Determination of resistance to environmental stress cracking (ESC) - Part 1: General guidance (ISO 22088-1:2006)
ISO 22088-1:2006 provides information and general guidance relevant to the selection of the test method to be used to determine environmental stress cracking (ESC) of thermoplastic materials.
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
Standards Content (Sample)
SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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,
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Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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© 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.
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.
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
ISO 22088-1:2006(E)
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ii © ISO 2006 – All rights reserved
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 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
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.
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 to the selection of the test
method to be used to determine environmental stress cracking (ESC).
1.2 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.
1.3 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.
1.4 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.
1.5 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.
1.6 Part 6 describes a method in which a slowly increasing strain is applied to a specimen immersed in a
stress cracking agent.
1.7 These methods are applicable to thermoplastic materials only.
1.8 These are essentially ranking tests and are not intended to provide data to be used for design or
performance prediction.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 150, Raw, refined and boiled linseed oil for paints and varnishes — Specifications and methods of test
ISO 293, Plastics — Compression moulding of test specimens of thermoplastic materials
ISO 29
...
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