ISO 24454:2008
(Main)Rubber — Acquisition and presentation of comparable multi-point data
Rubber — Acquisition and presentation of comparable multi-point data
ISO 24454:2008 identifies specific test procedures for the acquisition and presentation of comparable multi-point data for selected properties of rubber compounds. The data for each property are generated, using a single test method, as a function of important variables such as time, temperature and environmental effects. An important application consists in helping different suppliers produce material specification sheets in which the same set of properties is measured using the same conditions. Guidance on the interpretation of results is provided.
Caoutchouc — Acquisition et présentation de données multiples comparables
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 24454
First edition
2008-05-01
Rubber — Acquisition and presentation
of comparable multi-point data
Caoutchouc — Acquisition et présentation de données multiples
comparables
Reference number
ISO 24454:2008(E)
©
ISO 2008
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ISO 24454:2008(E)
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ISO 24454:2008(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Test piece preparation. 2
5 Conditioning. 2
6 Test requirements. 3
7 Mechanical properties. 3
7.1 Tensile stress-strain. 3
7.2 Other properties. 3
8 Viscoelastic properties. 3
8.1 Dynamic properties . 3
8.2 Stress relaxation. 4
8.3 Creep. 4
9 Degradation and environmental tests . 4
9.1 Exposure to heat. 4
9.2 Resistance to liquids. 5
9.3 Accelerated weathering . 5
9.4 Exposure to ozone. 5
9.5 Fatigue . 5
10 Presentation of results. 5
Annex A (informative) Interpretation of results. 9
Bibliography . 10
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ISO 24454:2008(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 24454 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee
SC 2, Testing and analysis.
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INTERNATIONAL STANDARD ISO 24454:2008(E)
Rubber — Acquisition and presentation of comparable
multi-point data
1 Scope
This International Standard identifies specific test procedures for the acquisition and presentation of
comparable multi-point data for selected properties of rubber compounds. The data for each property are
generated, using a single test method, as a function of important variables such as time, temperature and
environmental effects. An important application of this International Standard consists in helping different
suppliers produce material specification sheets in which the same set of properties is measured using the
same conditions.
Guidance on the interpretation of results is given in Annex A.
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 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 48, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and
100 IRHD)
ISO 815-1, Rubber, vulcanized or thermoplastic — Determination of compression set at ambient, elevated or
low temperatures — Part 1: At ambient or elevated temperatures
ISO 1431-1, Rubber, vulcanized and thermoplastic — Resistance to ozone cracking — Part 1: Static and
dynamic strain testing
ISO 1817, Rubber, vulcanized — Determination of the effects of liquids
ISO 2393, Rubber test mixes — Preparation, mixing and vulcanization — Equipment and procedures
ISO 3384, Rubber, vulcanized or thermoplastic — Determination of stress relaxation in compression at
ambient and elevated temperatures
ISO 4664-1, Rubber, vulcanized or thermoplastic — Determination of dynamic properties — Part 1: General
guidance
ISO 4665, Rubber, vulcanized and thermoplastic — Resistance to weathering
ISO 6914, Rubber, vulcanized or thermoplastic — Determination of ageing characteristics by measurement of
stress relaxation
ISO 6943, Rubber, vulcanized — Determination of tension fatigue
ISO 8013, Rubber, vulcanized — Determination of creep in compression or shear
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ISO 24454:2008(E)
ISO 11346, Rubber, vulcanized or thermoplastic — Estimation of life-time and maximum temperature of use
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test
methods
ISO 24453, Rubber — Acquisition and presentation of comparable single-point data
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
multi-point data
data characterizing a rubber material by means of a number of test results for a property measured over a
range of test conditions
3.2
indicative property
property that has been selected to reveal the influence of an environment on a material through a comparison
of measurements of the property before and after exposure
4 Test piece preparation
Where relevant, materials for test shall be prepared, mixed and moulded following the general principles given
in ISO 2393.
The detailed conditions used shall be as recommended by the manufacturer of the rubber compound and
shall, for each of the processing steps, be the same for each test piece except that different cure times may
be used for different sized test pieces.
The equipment, mixing cycle and conditions used for moulding shall be given in the test report.
The final preparation of test pieces (for example stamping from sheet) shall be in accordance with the relevant
test method standard.
The properties of a rubber compound can vary depending on the processing procedures used and this should
be taken into account when comparing materials.
To maximize the usefulness of results, processing conditions should be representative of those used in
production.
5 Conditioning
The time between mixing and moulding shall be between 24 h and one week.
The time between moulding and conditioning shall be between 16 h and four weeks. Recommendations for
storage of vulcanized rubber products are given in ISO 2230.
Test pieces shall be conditioned in accordance with the relevant test method standard. Where this refers to
standard laboratory conditions of temperature and/or humidity, these are taken to mean (23 ± 2) °C and
50 % RH.
NOTE If tests are carried out at the alternative standard laboratory temperature of (27 ± 2) °C, the results will not be
strictly comparable unless adjusted by the known relationship of the property with temperature.
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ISO 24454:2008(E)
For tests at temperatures other than (23 ± 2) °C, where specific instructions are not included in the test
method standard, condition the test pieces at the temperature at which the test is to be conducted for a period
sufficient to enable test pieces to attain substantial equilibrium in accordance with ISO 23529.
Details of the conditioning used shall be given in the test report.
6 Test requirements
Obtain multi-point data, as required, in accordance with Clauses 7 to 9.
NOTE Properties of rubbers generally vary significantly with temperature and, because service temperatures can
cover a wide range, temperature is an important and commonly used variable for the generation of multi-point data. It is
the main variable used in this International Standard for short-term properties.
Short-term mechanical properties also depend on the frequency of the applied stress or strain, and hence
data obtained with frequency as the variable are important for dynamic applications. Additionally, dynamic
response is generally amplitude-dependent.
Properties will vary over time due to viscoelastic and/or degradation effects, and hence data obtained with
time as the variable are essential for understanding the long-term behaviour of rubbers. Generally, the effects
of time are required in combination with the effect of temperature and/or other accelerating agents such as
fluids, ultraviolet light and repeated mechanical stress. The main variables specified in this International
Standard for stress relaxation, creep and degradation tests have been chosen to reflect the data that is
generally most useful with respect to service applications.
For all properties, the value of data generated will be increased by extending the levels of the main variable or
by testing as a function of additional variables.
7 Mechanical properties
7.1 Tensile stress-str
...
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