SIST EN ISO 11357-6:2013

SLOVENSKI STANDARD
SIST EN ISO 11357-6:2013
01-julij-2013
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Plastics - Differential scanning calorimetry (DSC) - Part 6: Determination of oxidation
induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT) (ISO
11357-6:2008)
Kunststoffe - Dynamische Differenz-Thermoanalyse (DSC) - Teil 6: Oxidations-
Induktionszeit (isothermische OIT) oder - Temperatur (isodynamische OIT) (ISO 11357-
6:2008)
Plastiques - Analyse calorimétrique différentielle (DSC) - Partie 6: Détermination du
temps d'induction à l'oxydation (OIT isotherme) et de la température d'induction à
l'oxydation (OIT dynamique) (ISO 11357-6:2008)
Ta slovenski standard je istoveten z: EN ISO 11357-6:2013
ICS:
17.200.10 Toplota. Kalorimetrija Heat. Calorimetry
83.080.01 Polimerni materiali na Plastics in general
splošno
SIST EN ISO 11357-6:2013 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 11357-6:2013

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SIST EN ISO 11357-6:2013


EUROPEAN STANDARD
EN ISO 11357-6

NORME EUROPÉENNE

EUROPÄISCHE NORM
January 2013
ICS 83.080.01
English Version
Plastics - Differential scanning calorimetry (DSC) - Part 6:
Determination of oxidation induction time (isothermal OIT) and
oxidation induction temperature (dynamic OIT) (ISO 11357-
6:2008)
Plastiques - Analyse calorimétrique différentielle (DSC) - Kunststoffe - Dynamische Differenz-Thermoanalyse (DSC)
Partie 6: Détermination du temps d'induction à l'oxydation - Teil 6: Oxidations-Induktionszeit (isothermische OIT) oder
(OIT isotherme) et de la température d'induction à - Temperatur (isodynamische OIT) (ISO 11357-6:2008)
l'oxydation (OIT dynamique) (ISO 11357-6:2008)
This European Standard was approved by CEN on 22 December 2012.

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

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11357-6:2013: E
worldwide for CEN national Members.

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SIST EN ISO 11357-6:2013
EN ISO 11357-6:2013 (E)
Contents Page
Foreword .3

2

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SIST EN ISO 11357-6:2013
EN ISO 11357-6:2013 (E)
Foreword
The text of ISO 11357-6:2008 has been prepared by Technical Committee ISO/TC 61 “Plastics” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 11357-6:2013 by
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 July 2013, and conflicting national standards shall be withdrawn at the
latest by July 2013.
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.
According to the CEN/CENELEC Internal Regulations, the national standards organisations 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 11357-6:2008 has been approved by CEN as a EN ISO 11357-6:2013 without any
modification.

3

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SIST EN ISO 11357-6:2013

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SIST EN ISO 11357-6:2013

INTERNATIONAL ISO
STANDARD 11357-6
Second edition
2008-06-15
Corrected version
2008-11-15


Plastics — Differential scanning
calorimetry (DSC) —
Part 6:
Determination of oxidation induction time
(isothermal OIT) and oxidation induction
temperature (dynamic OIT)
Plastiques — Analyse calorimétrique différentielle (DSC) —
Partie 6: Détermination du temps d'induction à l'oxydation
(OIT isotherme) et de la température d'induction à l'oxydation
(OIT dynamique)





Reference number
ISO 11357-6:2008(E)
©
ISO 2008

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SIST EN ISO 11357-6:2013
ISO 11357-6:2008(E)
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ii © ISO 2008 – All rights reserved

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SIST EN ISO 11357-6:2013
ISO 11357-6:2008(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Principle. 2
5 Apparatus and materials. 3
6 Test specimens . 4
7 Test conditions and specimen conditioning . 5
8 Calibration . 5
9 Procedure . 5
10 Expression of results . 8
11 Precision and bias . 10
12 Test report . 10
Bibliography . 12

© ISO 2008 – All rights reserved iii

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SIST EN ISO 11357-6:2013
ISO 11357-6:2008(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 11357-6 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-
chemical properties.
This second edition cancels and replaces the first edition (ISO 11357-6:2002), which has been technically
revised. The most important changes in the revision are the following:
⎯ a dynamic OIT method, i.e. the measurement of oxidation induction temperature, has been included;
⎯ it is now possible to perform measurements in air as well as in oxygen;
⎯ the range of specimen sizes has been narrowed and specimen size has been redefined in terms of
thickness instead of mass;
⎯ the possibility of making single-point routine measurements with reduced accuracy has been included.
It also cancels and replaces ISO/TR 10837:1991.
ISO 11357 consists of the following parts, under the general title Plastics — Differential scanning calorimetry
(DSC):
⎯ Part 1: General principles
⎯ Part 2: Determination of glass transition temperature
⎯ Part 3: Determination of temperature and enthalpy of melting and crystallization
⎯ Part 4: Determination of specific heat capacity
⎯ Part 5: Determination of characteristic reaction-curve temperatures and times, enthalpy of reaction and
degree of conversion
⎯ Part 6: Determination of oxidation induction time (isothermal OIT) and oxidation induction temperature
(dynamic OIT)
⎯ Part 7: Determination of crystallization kinetics
In this corrected version, the sixth paragraph in the Foreword has been modified to reflect the fact that the
second edition replaces not only the first edition but also ISO/TR 10837:1991, Determination of the thermal
stability of polyethylene (PE) for use in gas pipes and fittings.
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SIST EN ISO 11357-6:2013
ISO 11357-6:2008(E)
Introduction
It should be noted that the measurement of oxidation induction time or temperature described in this part of
ISO 11357 provides a tool to assess the conformity of the material tested to a given formulation of plastics
compounds, but it is not intended to provide the concentration of antioxidant. Different antioxidants may have
different oxidation induction times or temperatures. Due to interaction of the antioxidant with other substances
in the formulation, different oxidation induction times or temperatures may result even with products having
the same type and concentration of antioxidant.

© ISO 2008 – All rights reserved v

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SIST EN ISO 11357-6:2013

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SIST EN ISO 11357-6:2013
INTERNATIONAL STANDARD ISO 11357-6:2008(E)

Plastics — Differential scanning calorimetry (DSC) —
Part 6:
Determination of oxidation induction time (isothermal OIT) and
oxidation induction temperature (dynamic OIT)
SAFETY STATEMENT — Persons using this document should be familiar with normal laboratory
practice, if applicable. This document does not purport to address all of the safety concerns, if any,
associated with its use. It is the responsibility of the user to establish appropriate safety and health
practices and to ensure compliance with any regulatory requirements.
1 Scope
This part of ISO 11357 specifies methods for the determination of oxidation induction time (isothermal OIT)
and oxidation induction temperature (dynamic OIT) of polymeric materials by means of differential scanning
calorimetry (DSC). It is applicable to polyolefin resins that are in a fully stabilized or compounded form, either
as raw materials or finished products. It may be applicable to other plastics.
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 293, Plastics — Compression moulding of test specimens of thermoplastic materials
ISO 294-3, Plastics — Injection moulding of test specimens of thermoplastic materials — Part 3: Small plates
ISO 472, Plastics — Vocabulary
ISO 1872-2, Plastics — Polyethylene (PE) moulding and extrusion materials— Part 2: Preparation of test
specimens and determination of properties
ISO 1873-2, Plastics — Polypropylene (PP) moulding and extrusion materials — Part 2: Preparation of test
specimens and determination of properties
ISO 8986-2, Plastics — Polybutene (PB) moulding and extrusion materials — Part 2: Preparation of test
specimens and determination of properties
1)
ISO 11357-1:— , Plastics — Differential scanning calorimetry (DSC) — Part 1: General principles


1) To be published. (Revision of ISO 11357-1:1997)
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SIST EN ISO 11357-6:2013
ISO 11357-6:2008(E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472 and ISO 11357-1 and the
following apply:
3.1
oxidation induction time (isothermal OIT)
relative measure of a stabilized material’s resistance to oxidative decomposition, determined by the
calorimetric measurement of the time interval to the onset of exothermic oxidation of the material at a
specified temperature in an oxygen or air atmosphere, under atmospheric pressure
NOTE It is expressed in minutes (min).
3.2
oxidation induction temperature (dynamic OIT)
relative measure of a stabilized material’s resistance to oxidative decomposition, determined by the
calorimetric measurement of the temperature of the onset of exothermic oxidation of the material when
subjected to a specified heating rate in an oxygen or air atmosphere, under atmospheric pressure
NOTE It is expressed in degrees Celsius (°C).
4 Principle
4.1 General
The time for which, or the temperature up to which, an antioxidant stabilizer system present in a test specimen
inhibits oxidation is measured while the specimen is held isothermally at a specified temperature or heated at
a constant rate in an oxygen or air atmosphere. The oxidation induction time or temperature is an assessment
of the level (or degree) of stabilization of the material tested. Higher test temperatures will result in shorter
oxidation induction times; faster heating rates will result in higher oxidation induction temperatures. The
oxidation induction time and temperature are also dependent on the surface area of the specimen available
for oxidation. It should be noted that tests carried out in pure oxygen will result in a lower oxidation induction
time or temperature than tests performed under normal atmospheric-air conditions.
NOTE The oxidation induction time or temperature can be indicative of the effective antioxidant level present in the
test specimen. Caution should be exercised in data interpretation, however, since oxidation reaction kinetics are a function
of temperature and the inherent properties of the additives contained in the sample. For example, oxidation induction time
or temperature results are often used to select optimum resin formulations. Volatile antioxidants or differences in activation
energies of oxidation reactions may generate poor oxidation induction time or temperature results, even though the
antioxidants may perform adequately at the intended temperature of use of the finished product.
4.2 Oxidation induction time (isothermal OIT)
The specimen and a reference material are heated at a constant rate in an inert gaseous environment (a flow
of nitrogen). When the specified temperature has been reached, the atmosphere is changed to oxygen or air
maintained at the same flow rate. The specimen is then held at constant temperature until the oxidative
reaction is displayed on the thermal curve. The isothermal OIT is the time interval between the initiation of
oxygen or air flow and the onset of the oxidative reaction. The onset of oxidation is indicated by an abrupt
increase in the specimen’s evolved heat and may be observed by a differential scanning calorimeter (DSC).
The isothermal OIT is determined in accordance with 9.6.1.
4.3 Oxidation induction temperature (dynamic OIT)
The specimen and a reference material are heated at a constant rate in an oxygen or air atmosphere until the
oxidative reaction is displayed on the thermal curve. The dynamic OIT is the temperature of the onset of the
oxidative reaction. The onset of oxidation is indicated by an abrupt increase in the specimen’s evolved heat
and may be observed by a differential scanning calorimeter (DSC). The dynamic OIT is determined in
accordance with 9.6.2.
2 © ISO 2008 – All rights reserved

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