SIST EN ISO 4599:2000
(Main)Plastics - Determination of resistance to environmental stress cracking (ESC) - Bent strip method (ISO 4599:1986)
Plastics - Determination of resistance to environmental stress cracking (ESC) - Bent strip method (ISO 4599:1986)
Kunststoffe - Bestimmung der Beständigkeit gegen umgebungsbedingte Spannungsrißbildung (ESC) - Biegestreifenverfahren (ISO 4599:1986)
Diese Internationale Norm beschreibt eine Methode zur Bestimmung der Beständigkeit gegen umgebungsbedingte Spannungsrißbildung (ESC) von Kunststoffen, die einer konstanten Dehnung unterworfen sind. ESC wird dabei bestimmt durch die Änderung einer geeignet ausgewählten Eigenschaft von Probekörpern, die im gedehnten Zustand über eine definierte Zeit in der Umgebung waren.
Plastiques - Détermination de la fissuration sous contrainte dans un environnement donné (ESC) - Méthode de l'éprouvette courbée (ISO 4599:1986)
Polimerni materiali - Določanje napetostne korozije (ESC) - Metoda z upognjenim trakom (ISO 4599:1986)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 4599:2000
01-maj-2000
3ROLPHUQLPDWHULDOL'RORþDQMHQDSHWRVWQHNRUR]LMH (6& 0HWRGD]XSRJQMHQLP
WUDNRP ,62
Plastics - Determination of resistance to environmental stress cracking (ESC) - Bent strip
method (ISO 4599:1986)
Kunststoffe - Bestimmung der Beständigkeit gegen umgebungsbedingte
Spannungsrißbildung (ESC) - Biegestreifenverfahren (ISO 4599:1986)
Plastiques - Détermination de la fissuration sous contrainte dans un environnement
donné (ESC) - Méthode de l'éprouvette courbée (ISO 4599:1986)
Ta slovenski standard je istoveten z: EN ISO 4599:1996
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
SIST EN ISO 4599:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 4599:2000
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SIST EN ISO 4599:2000
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SIST EN ISO 4599:2000
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SIST EN ISO 4599:2000
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SIST EN ISO 4599:2000
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SIST EN ISO 4599:2000
International Standard
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.ME)I(~YHAPOAHAR OPI-AHM3ALlMR l-IO CTAHAAPTM3ALlMM~ORGANISATION INTERNATIONALE DE NORMALISATION
Plastics - Determination of resistance to environmental
stress cracking (ESC) - Bent Strip method
Plastiques - D&rmination de Ia fissuration sous contrainte dans un environnement donnh (ESC) - Methode de l’eprouvette
courbee
First edition - 1986-04-15
Ref. No. ISO 45994986 (E)
UDC 678.5/.8 : 620.191.33
Co
Q:
tests, environmental tests, cracking tests, determination, crazing resistance, stress factor.
Descriptors : plastics,
F
I
0
Price based on 6 pages
52
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SIST EN ISO 4599:2000
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. Esch 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, govern-
mental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council. They are approved in accordance with ISO procedures requiring at
least 75 % approval by the member bodies voting.
International Standard ISO 4599 was prepared by Technical Committee ISO/TC 61,
Plastics.
Users should note that all International Standards undergo revision from time to time
and that any reference made herein to any other International Standard implies its
latest edition, unless otherwise stated.
0 International Organkation for Standardkation, 1986
Printed in Switzerland
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SIST EN ISO 4599:2000
INTERNATIONAL STANDARD ISO 45994986 (E)
Plastics - Determination of resistance to environmental
stress cracking (ESC) - Bent Strip method
0 Introduction 1 Scope and field of application
Stress cracking is exhibited by many materials, including This International Standard specifies a method for the deter-
plastics. When a plastic material is stressed or strained in air mination of environmental stress cracking (ESC) resistance of
plastics by means of a constant prestrain test. ESC will be in-
below its yield Point, stress cracking may occur after a period of
time which may be very long. The Stresses may be internal or dicated by the Change of a suitably Chosen indicative property
of specimens that have been prestrained for a definite time in
external or a combination of both. Exposure to a Chemical
the environment. The method of test is suitable for determining
medium simultaneously with the same stress or strain may
result in a dramatic shortening of the time to failure. Cracking the resistance of sheets and of flat test specimens to en-
vironmental stress cracking, especially the sensitivity of localiz-
accelerated in this way is referred to as environmental stress
cracking (ESC). ed surface regions of specimens to ESC.
For the determination of the ESC sensitivity of finished articles
Other modes of failure than stress cracking may result in the
shortening of the time to failure in this test, but such modes are or the bulk of a material subjected to a constant strain, see
ISO 4600.
included in the term “environmental stress cracking” as known
in the trade.
The bent Strip method is suitable for the determination of ESC
caused by gases and liquids as well as by solids containing
The Cracks produced may penetrate completely through the
migrating substances (e.g. polymeric adhesives and materials
thickness of the material, separating it into two or more pieces,
containing plasticizers) in contact with a specific polymer.
or they may be arrested on reaching regions of lower stress or
different material morphology.
Preferably, this method is used to determine the ESC resistance
of rigid plastics with only moderate stress relaxation in time.
The determination of ESC resistance is a complex procedure
because it is influenced by many Parameters, including:
For a constant strain test, refer to ISO 4600. For a constant
stress test, refer to ISO 6252.
-
test specimen dimensions;
-
test specimen state (orientation, structure, internal
stress) ;
2 References
-
stress and strain;
ISO 178, Plastics - Determination o f flexural propertles o f rigid
-
temperature of test;
plastics.
- duration of test;
Determination of Charp y impact resistance
ISO 179, Plastics -
of rigid plastics (Charpy impact flexural test).
- test environment ;
ISO 291, Plastics - Standard atmospheres for conditioning
- failure criterion.
and testing.
By keeping all but one Parameter constant, the influence of the
ISO 294, Plastics - lnjection moulding test specimens of ther-
variable Parameter on ESC resistance tan be assessed. The moplas tic ma terials.
main objective of ESC measurements is to determine the effect
of Chemical media on plastics (test specimens and articles). The ISO 527, Plastics - Determination o f tensile propetties.
measurements may also be used to evaluate the influence of
the moulding conditions upon the quality of an article, when ISO 2557, Plastics - Amorphous thermoplastic moulding
the failure Inode corresponds to that obtained in actual Service. ma terials - Preparation of test specimens with a defrned level
of shrinkage.
lt may not be possible, however, to establish any direct correla-
ISO 2818, Plastics - Preparation of test specimens by ma-
tion between the results of short-term ESC measurements on
chining.
test specimens and actual long-term Service behaviour.
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SIST EN ISO 4599:2000
ISO 4599-1986 (EI
2 lt is recommended that the test specimen for zero prestrain be
ISO 4600, Plastics - Determination o f en vironmen tal s tress
clamped on to a flat former to prevent warping due to the effect of the
Ball or pin impression method.
cracking (ESC) -
medium.
ISO 6252, Plastics - Determination of environmen tal stress
cracking (ESCJ - Constant tensile stress method.
3.4 failure prestrain, &F: The lowest prestrain
in the
prestrain series at which failure is observed.
3 Def initions
indicative property, 1 : The
35 . observed to deter-
ProPefiY
following
For the purpose of this International Standard, the
mine failure using a criterion given in the ta ble.
definitions apply.
3.6 relative strain factor, IM: The ratio of the value of
. the nominal value of the strain in the
3.1 flexural strain, c,. failure prestrain determined in the test medium to that deter-
extended surface of a flat test specimen of thickness d, bent
mined in the reference medium (usually air) for the same time of
over the Segment of a circle with radius r, calculated from the exposure.
equation
d
3.7 prestrain period, t: The time during which the test
e, = - x 100 (%)
2r + d
specimens are in contact with the test environment while
prestrained.
(See figure 1.)
3.8 prestrain temperature, 7’: The temperature at which
the test specimens are in contact with the test environment
while subjected to a strain.
3.9 test environment: the Chemical liquid, gas, Paste, solid
or other medium selected for contact with the test specimens
during the prestrain period.
4 Principle
A test specimen suitable for the determination of the indicative
property is clamped with one of its faces over a former of cons-
P : test specimen
tant radius and brought into contact with the test environment.
Due to the influence of the environment in the presence of
d : thickness of the test specimen
strain, crazes may be generated which with time sometimes
F : former
develop into visible Cracks.
r : radius of former
By using a series of formers with decreasing radii one obtains a
c : clamps
series of test specimens with increasing strains in the outer sur-
faces.
e, : nominal strain in the extended surface
After the agreed duration of contact with the test environment,
Figure 1 -
Test specimen P with defined strain in the
the test specimens are visually observed, unclamped and
outer surface
assessed by mechanical or other test. The failure strain that
corresponds to the failure criterion is obtained directly from the
n levels a pplied tabulated values or from a graph.
3.2 prestrain value: One of a series of strai
to successive test specimens during exposure.
The criteria usually determined are:
- failure strain;
3.3 prestrain series : A number of prestrain values, in-
-
relative strain factor.
cluding Zero.
NOTES
NOTES
1 Normally, the results of the mechanical test on test specimens with
1 The maximum prestrain shall be less than the elongation at yield
zero prestrain are equivalent whether determined in air or a medium. If
(ISO 527).
the property measured after exposure to the medium at zero strain is
different from that after exposure in air at zero strain, embrittlement or 2 The failur
...
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