IEC TS 60695-5-2:2021
(Main)Fire hazard testing - Part 5-2: Corrosion damage effects of fire effluent - Summary and relevance of test methods
Fire hazard testing - Part 5-2: Corrosion damage effects of fire effluent - Summary and relevance of test methods
IEC TS 60695-5-2:2021 gives a summary of the test methods that are used in the assessment of the corrosivity of fire effluent. It presents a brief summary of test methods in common use, either as international standards or national or industry standards. It includes special observations on their relevance, for electrotechnical products and their materials, to real fire scenarios and gives recommendations on their use.
One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications. The requirements, test methods or test conditions of this publication will not apply unless specifically referred to or included in the relevant publications.
This third edition cancels and replaces the second edition published in 2002.
The main changes with respect to the previous edition are listed below:
– References to IEC TS 60695-5-3 (withdrawn in 2014) have been removed.
– ISO/TR 9122-1 has been revised by ISO 19706.
– References to ISO 11907-2 and ISO 11907-3 have been removed.
– Terms and definitions have been updated.
– Text in 5.4 has been updated.
– Text in 5.5.8 (5.7.8 in Ed. 2) has been updated.
– Text in Clause 6 (7 in Ed. 2) has been updated.
– Bibliographic references have been updated.
It has the status of a basic safety publication in accordance with IEC Guide 104 and ISO/IEC Guide 51.
This technical specification is to be read in conjunction with IEC 60695-5-1.
General Information
Relations
Standards Content (Sample)
IEC TS 60695-5-2 ®
Edition 3.0 2021-06
TECHNICAL
SPECIFICATION
Fire hazard testing –
Part 5-2: Corrosion damage effects of fire effluent – Summary and relevance of
test methods
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 IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
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and French, with equivalent terms in 18 additional languages.
once a month by email.
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(IEV) online.
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need further assistance, please contact the Customer Service
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IEC TS 60695-5-2 ®
Edition 3.0 2021-06
TECHNICAL
SPECIFICATION
Fire hazard testing –
Part 5-2: Corrosion damage effects of fire effluent – Summary and relevance of
test methods
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.220.99; 19.020; 29.020 ISBN 978-2-8322-9842-8
– 2 – IEC TS 60695-5-2:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Classification of test methods . 9
4.1 General . 9
4.2 Test specimen . 9
4.2.1 Product testing . 9
4.2.2 Material or composite sample testing . 9
4.3 The physical fire model . 9
4.4 The nature of the corrosivity measurement . 9
4.4.1 Product as target . 9
4.4.2 Simulated product as target . 9
4.4.3 Indirect assessment . 11
5 Published test methods . 11
5.1 General . 11
5.2 Tests for the determination of halogen acid in combustion gases . 11
5.2.1 Standards . 11
5.2.2 Purpose and principle . 11
5.2.3 Test specimen . 11
5.2.4 Test method . 11
5.2.5 Repeatability and reproducibility . 11
5.2.6 Relevance of test data to corrosion hazard assessment . 12
5.3 Tests for the determination of the acidity and conductivity of combustion
gases dissolved in an aqueous solution . 12
5.3.1 Standards . 12
5.3.2 Purpose and principle . 12
5.3.3 Test specimen . 12
5.3.4 Test method . 12
5.3.5 Repeatability and reproducibility . 12
5.3.6 Relevance of test data to corrosion hazard assessment . 13
5.4 Tests for the determination of corrosive gases by evaluation of copper
corrosion in ASTM D 2671 – Sections 89 to 95 [9] . 13
5.4.1 Purpose and principle . 13
5.4.2 Test specimen . 13
5.4.3 Test methods . 13
5.4.4 Special observations . 13
5.4.5 Repeatability and reproducibility . 13
5.4.6 Relevance of test data to corrosion hazard assessment . 13
5.5 Cone corrosimeter method . 14
5.5.1 Standards . 14
5.5.2 Purpose and principle . 14
5.5.3 Test specimen . 14
5.5.4 Corrosion target . 14
5.5.5 Test method . 14
5.5.6 Special observation . 15
5.5.7 Repeatability and reproducibility . 15
5.5.8 Relevance of test data to corrosion hazard assessment . 15
6 Overview of methods and relevance of data . 15
Annex A (informative) Acidity and conductivity of aqueous solutions – Test methods . 18
Annex B (informative) Determination of repeatability and reproducibility –
Comparative tests of solutions of combustion gases . 19
Bibliography . 23
Figure 1 – Schematic drawing of a typical corrosion target of defined metal thickness . 15
Table 1 – Characteristics of fire stages (from Table 1 in ISO 19706:2011) . 10
Table 2 – Overview of corrosivity test methods . 17
Table A.1 – Test methods for the measurement of acidity and conductivity of aqueous
solutions obtained after bubbling combustion effluent through water . 18
Table B.1 – Determination of repeatability and reproducibility – Comparative pH tests
on solutions of combustion gases . 20
Table B.2 – Determination of repeatability and reproducibility – Comparative resistivity
tests on solutions of combustion gases . 21
Table B.3 – Results obtained on brominated polycarbonate . 22
– 4 – IEC TS 60695-5-2:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIRE HAZARD TESTING –
Part 5-2: Corrosion damage effects of fire effluent –
Summary and relevance of test methods
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 60695-5-2, which is a technical specification, has been prepared by IEC technical
committee 89: Fire hazard testing.
This third edition cancels and replaces the second edition published in 2002.
The main changes with respect to the previous edition are listed below:
– References to IEC TS 60695-5-3 (withdrawn in 2014) have been removed.
– ISO/TR 9122-1 has been revised by ISO 19706.
– References to ISO 11907-2 and ISO 11907-3 have been removed.
– Terms and definitions have been updated.
– Text in 5.4 has been updated.
– Text in 5.5.8 (5.7.8 in Ed. 2) has been updated.
– Text in Clause 6 (7 in Ed. 2) has been updated.
– Bibliographic references have been updated.
It has the status of a basic safety publication in accordance with IEC Guide 104 and
ISO/IEC Guide 51.
The text of this technical specification is based on the following documents:
Draft Report on voting
89/1473/DTS 89/1506/RVDTS
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Specification is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement,
available at www.iec.ch/members_experts/refdocs. The main document types developed by
IEC are described in greater detail at www.iec.ch/standardsdev/publications.
In this technical specification, the following print types are used:
Arial bold: terms referred to in Clause 3
This technical specification is to be read in conjunction with IEC 60695-5-1.
A list of all parts in the IEC 60695 series, published under the general title Fire hazard testing,
can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – IEC TS 60695-5-2:2021 © IEC 2021
INTRODUCTION
In the design of an electrotechnical product the risk of fire and the potential hazards
associated with fire need to be considered. In this respect the objective of component, circuit
and equipment design, as well as the choice of materials, is to reduce the risk of fire to a
tolerable level even in the event of reasonably foreseeable (mis)use, malfunction or failure.
IEC 60695-1-10 [1] , IEC 60695-1-11 [2], and IEC 60695-1-12 [3] provide guidance on how
this is to be accomplished.
Fires involving electrotechnical products can also be initiated from external non-electrical
sources. Considerations of this nature are dealt with in an overall fire hazard assessment.
The aim of the IEC 60695 series is to save lives and property by reducing the number of fires
or reducing the consequences of the fire. This can be accomplished by:
• trying to prevent ignition caused by an electrically energised component part and, in the
event of ignition, to confine any resulting fire within the bounds of the enclosure of the
electrotechnical product.
• trying to minimise flame spread beyond the product’s enclosure and to minimise the
harmful effects of fire effluents including heat, smoke, and toxic or corrosive combustion
products.
All fire effluent is corrosive to some degree and the level of potential to corrode depends on
the nature of the fire, the combination of combustible materials involved in the fire, the nature
of the substrate under attack, and the temperature and relative humidity of the environment in
which the corrosion is taking place. There is no evidence that fire effluent from
electrotechnical products offers greater risk of corrosion damage than the fire effluent
from other products such as furnishings, building materials, etc.
The performance of electrical and electronic components can be adversely affected by
corrosion damage when subjected to fire effluent. A wide variety of combinations of small
quantities of effluent gases, smoke particles, moisture and temperature may provide
conditions for electrical component or system failures from breakage, overheating or shorting.
Evaluation of potential corrosion damage is particularly important for high value and safety-
related electrotechnical products and installations.
Technical committees responsible for the products will choose the test(s) and specify the level
of severity.
The study of corrosion damage requires an interdisciplinary approach involving chemistry,
electricity, physics, mechanical engineering, metallurgy and electrochemistry. In the
preparation of this part of IEC 60695, all of the above have been considered.
IEC 60695-5-1 defines the scope of the guidance and indicates the field of application.
IEC 60695-5-2 provides a summary of test methods including relevance and usefulness.
___________
Numbers in square brackets refer to the bibliography.
FIRE HAZARD TESTING –
Part 5-2: Corrosion damage effects of fire effluent –
Summary and relevance of test methods
1 Scope
This part of IEC 60695, which is a technical specification, gives a summary of the test
methods that are used in the assessment of the corrosivity of fire effluent. It presents a brief
summary of test methods in common use, either as international standards or national or
industry standards. It includes special observations on their relevance, for electrotechnical
products and their materials, to real fire scenarios and gives recommendations on their use.
One of the responsibilities of a technical committee is, wherever applicable, to make use of
basic safety publications in the preparation of its publications. The requirements, test
methods or test conditions of this publication will not apply unless specifically referred to or
included in the relevant publications.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements 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.
IEC 60695-4:2012, Fire hazard testing – Part 4: Terminology concerning fire tests for
electrotechnical products
IEC 60695-5-1, Fire hazard testing – Part 5-1: Corrosion damage effects of fire effluent -
General guidance
IEC GUIDE 104, The preparation of safety publications and the use of basic safety
publications and group safety publications
ISO Guide 51, Safety aspects – Guidelines for their inclusion in standards
ISO 13943:2017, Fire safety – Vocabulary
ISO 19706:2011, Guidelines for assessing the fire threat to people
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60695-4:2012 and
ISO 13943:2017 (some of which are reproduced below), apply.
3.1
corrosion damage
physical and/or chemical damage or impaired function caused by chemical action
[SOURCE: ISO 13943:2017, 3.69]
– 8 – IEC TS 60695-5-2:2021 © IEC 2021
3.2
corrosion target
sensor used to determine the degree of corrosion damage (3.1), under specified test
conditions
Note 1 to entry: This sensor may be a product, a component. It may also be a reference material or object used to
simulate the behaviour of a product or a component.
[SOURCE: ISO 13943:2017, 3.70]
3.3
fire effluent
all gases and aerosols, including suspended particles created by combustion or
pyrolysis (3.6) and emitted to the environment
[SOURCE: ISO 13943:2017, 3.123]
3.4
fire scenario
qualitative description of the course of a fire with respect to time, identifying key events that
characterize the studied fire and differentiate it from other possible fires
Note 1 to entry: See fire scenario cluster (ISO 13943:2017, 3.154) and representative fire scenario
(ISO 13943:2017, 3.153).
Note 2 to entry: It typically defines the ignition and fire growth processes, the fully developed fire stage, the fire
decay stage, and the environment and systems that will impact on the course of the fire.
Note 3 to entry: Unlike deterministic fire analysis, where fire scenarios are individually selected and used as
design fire scenarios, in fire risk assessment, fire scenarios are used as representative fire scenarios within fire
scenario clusters.
[SOURCE: ISO 13943:2017, 3.152]
3.5
physical fire model
laboratory process, including the apparatus, the environment and the fire test procedure
intended to represent a certain phase of a fire
[SOURCE: ISO 13943:2017, 3.298]
3.6
pyrolysis
chemical decomposition of a substance by the action of heat
Note 1 to entry: Pyrolysis is often used to refer to a stage of fire before flaming combustion has begun.
Note 2 to entry: In fire science, no assumption is made about the presence or absence of oxygen.
[SOURCE: ISO 13943:2017, 3.316]
3.7
smoke
visible part of a fire effluent (3.3)
[SOURCE: ISO 13943:2017, 3.347]
4 Classification of test methods
4.1 General
Test methods can be classified according to three criteria:
a) the nature of the test specimen which is burned;
b) the physical fire model used in the test;
c) the nature of the measurement of corrosivity.
4.2 Test specimen
4.2.1 Product testing
The test specimen is a manufactured product or a representative portion of a product.
Examples include: a printed circuit board, a switchboard, a computer or a cable.
4.2.2 Material or composite sample testing
The test specimen is a basic material (solid or liquid), or composite of materials.
4.3 The physical fire model
Test methods use a wide variety of heat sources and geometries. The amount, the rate of
production and the corrosive nature of fire effluent released from a given material or product
is not an inherent property of that material or product, but is critically dependent on the
conditions under which that material or product is burnt. In a fire scenario or a fire test, the
chemical nature of the fuel, the decomposition temperature and the amount of ventilation are
the main variables which affect the composition of fire effluent.
It is critical to show that the test conditions defined in a standardized test method are relevant
to, and replicate, the desired stage of a real fire. ISO has published a general classification of
fire stages in ISO 19706, shown in Table 1. The important factors affecting effluent production
are oxygen concentration and irradiance/temperature.
4.4 The nature of the corrosivity measurement
4.4.1 Product as target
In these cases the corrosion target is a manufactured product or a representative portion of
a product. Examples include: printed wiring boards, switchboards, washing machines and
computers.
The corrosion damage effects of fire effluent on the product can be assessed by
degradation of function as determined by inspection or measurement.
4.4.2 Simulated product as target
When a simulated product is used as the target, the corrosion target is typically a reference
circuit, a thin sheet of metal or a metal mirror. The corrosion damage effects of fire effluent
on the target can be assessed by changes in appearance, mass or measurements of
mechanical, physical or electrical characteristics.
– 10 – IEC TS 60695-5-2:2021 © IEC 2021
Table 1 – Characteristics of fire stages (from Table 1 in ISO 19706:2011)
Max. temperature Oxygen volume
Heat flux to
100×[CO2]
[CO]
fuel surface
°C % Fuel/air
([CO2]+[CO])
Fire stage equivalence
[CO2]
ratio (plume)
Fuel surface Upper layer Entrained Exhausted
kW/m
v/v
% efficiency
1 Non-flaming
a self-sustaining not
d
450 to 800 20 20 – 0,1 to 1 50 to 90
25 to 85
(smouldering
...
IEC TS 60695-5-2 ®
Edition 3.0 2021-06
REDLINE VERSION
TECHNICAL
SPECIFICATION
colour
inside
Fire hazard testing –
Part 5-2: Corrosion damage effects of fire effluent – Summary and relevance of
test methods
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 IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC online collection - oc.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 000 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 18 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC TS 60695-5-2 ®
Edition 3.0 2021-06
REDLINE VERSION
TECHNICAL
SPECIFICATION
colour
inside
Fire hazard testing –
Part 5-2: Corrosion damage effects of fire effluent – Summary and relevance of
test methods
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.220.99; 19.020; 29.020 ISBN 978-2-8322-9866-4
– 2 – IEC TS 60695-5-2:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 9
4 Classification of test methods . 9
4.1 Introduction General . 11
4.2 Test specimen . 11
4.2.1 Product testing . 11
4.2.2 Material or composite sample testing . 11
4.3 The physical fire model . 12
4.4 The nature of the corrosivity measurement . 12
4.4.1 Product testing as target . 12
4.4.2 Simulated product testing as target . 12
4.4.3 Indirect assessment . 14
5 Published test methods . 14
5.1 Introduction General . 14
5.2 Tests for the determination of halogen acid in combustion gases . 14
5.2.1 Standards . 14
5.2.2 Purpose and principle . 14
5.2.3 Test specimen . 15
5.2.4 Test method . 15
5.2.5 Repeatability and reproducibility . 15
5.2.6 Relevance of test data to corrosion hazard assessment . 15
5.3 Tests for the determination of the acidity and conductivity of combustion
gases dissolved in an aqueous solution . 15
5.3.1 Standards . 15
5.3.2 Purpose and principle . 16
5.3.3 Test specimen . 16
5.3.4 Test method . 16
5.3.5 Repeatability and reproducibility . 16
5.3.6 Relevance of test data to corrosion hazard assessment . 16
5.4 Tests for the determination of corrosive gases by using
the copper mirror test in ASTM D 2671-00 [9] evaluation of copper corrosion
in ASTM D 2671 – Sections 89 to 95 0 . 16
5.4.1 Purpose and principle . 16
5.4.2 Test specimen . 16
5.4.3 Test methods . 17
5.4.4 Special observations . 17
5.4.5 Repeatability and reproducibility . 17
5.4.6 Relevance of test data to corrosion hazard assessment . 17
5.5 Static method (ISO 11907-2 [10]) .
5.6 Travelling furnace method (ISO 11907-3 [11]) .
5.5 Cone corrosimeter method . 22
5.5.1 Standards . 22
5.5.2 Purpose and principle . 22
5.5.3 Test specimen . 22
5.5.4 Corrosion target . 22
5.5.5 Test method . 22
5.5.6 Special observation . 23
5.5.7 Repeatability and reproducibility . 23
5.5.8 Relevance of test data to corrosion hazard assessment . 23
6 Leakage current and metal loss (IEC 60695-5-3) .
6.1 Purpose and principle .
6.2 Test specimen .
6.3 Corrosion targets .
6.4 Test method .
6 Overview of methods and relevance of data . 25
Annex A (informative) Acidity and conductivity of aqueous solutions – Test methods . 28
Annex B (informative) Determination of repeatability and reproducibility –
Comparative tests of solutions of combustion gases . 29
Bibliography . 33
Figure – Schematic drawing of a serpentine-track resistance target .
Figure – Interdigitated leakage current target .
Figure 1 – Schematic drawing of a typical corrosion target of defined metal thickness . 23
Table 1 – General classification of fire stages in accordance with ISO/TR 9122-1 .
Table 1 – Characteristics of fire stages (from Table 1 in ISO 19706:2011) . 13
Table 2 – Overview of corrosivity test methods . 27
Table A.1 – Test methods for the measurement of acidity and conductivity of aqueous
solutions obtained after bubbling combustion effluent through water . 28
Table B.1 – Determination of repeatability and reproducibility – Comparative pH tests
on solutions of combustion gases . 30
Table B.2 – Determination of repeatability and reproducibility – Comparative resistivity
tests on solutions of combustion gases . 31
Table B.3 – Results obtained on brominated polycarbonate . 32
– 4 – IEC TS 60695-5-2:2021 RLV © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIRE HAZARD TESTING –
Part 5-2: Corrosion damage effects of fire effluent –
Summary and relevance of test methods
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes made to
the previous edition IEC TS 60695-5-2:2002. A vertical bar appears in the margin wherever a
change has been made. Additions are in green text, deletions are in strikethrough red text.
IEC 60695-5-2, which is a technical specification, has been prepared by IEC technical
committee 89: Fire hazard testing.
This third edition cancels and replaces the second edition published in 2002.
The main changes with respect to the previous edition are listed below:
– References to IEC TS 60695-5-3 (withdrawn in 2014) have been removed.
– ISO/TR 9122-1 has been revised by ISO 19706.
– References to ISO 11907-2 and ISO 11907-3 have been removed.
– Terms and definitions have been updated.
– Text in 5.4 has been updated.
– Text in 5.5.8 (5.7.8 in Ed. 2) has been updated.
– Text in Clause 6 (7 in Ed. 2) has been updated.
– Bibliographic references have been updated.
It has the status of a basic safety publication in accordance with IEC Guide 104 and
ISO/IEC Guide 51.
The text of this technical specification is based on the following documents:
Draft Report on voting
89/1473/DTS 89/1506/RVDTS
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Technical Specification is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement,
available at www.iec.ch/members_experts/refdocs. The main document types developed by
IEC are described in greater detail at www.iec.ch/standardsdev/publications.
In this technical specification, the following print types are used:
Arial bold: terms referred to in Clause 3
This technical specification is to be read in conjunction with IEC 60695-5-1.
A list of all parts in the IEC 60695 series, published under the general title Fire hazard testing,
can be found on the IEC website.
– 6 – IEC TS 60695-5-2:2021 RLV © IEC 2021
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.
INTRODUCTION
The risk of fire should be considered in any electrical circuit. With regard to this risk, the
circuit and equipment design, the selection of components and the choice of materials should
contribute towards reducing the likelihood of fire even in the event of foreseeable abnormal
use, malfunction or failure. The practical aim should be to prevent ignition caused by electrical
malfunction but, if ignition and fire occur, to control the fire preferably within the bounds of the
enclosure of the electrotechnical product.
In the design of an electrotechnical product the risk of fire and the potential hazards
associated with fire need to be considered. In this respect the objective of component, circuit
and equipment design, as well as the choice of materials, is to reduce the risk of fire to a
tolerable level even in the event of reasonably foreseeable (mis)use, malfunction or failure.
IEC 60695-1-10 [1] , IEC 60695-1-11 [2], and IEC 60695-1-12 [3] provide guidance on how
this is to be accomplished.
Fires involving electrotechnical products can also be initiated from external non-electrical
sources. Considerations of this nature are dealt with in an overall fire hazard assessment.
The aim of the IEC 60695 series is to save lives and property by reducing the number of fires
or reducing the consequences of the fire. This can be accomplished by:
• trying to prevent ignition caused by an electrically energised component part and, in the
event of ignition, to confine any resulting fire within the bounds of the enclosure of the
electrotechnical product.
• trying to minimise flame spread beyond the product’s enclosure and to minimise the
harmful effects of fire effluents including heat, smoke, and toxic or corrosive combustion
products.
All fire effluent is corrosive to some degree and the level of potential to corrode depends on
the nature of the fire, the combination of combustible materials involved in the fire, the nature
of the substrate under attack, and the temperature and relative humidity of the environment in
which the corrosion is taking place. There is no evidence that fire effluent from
electrotechnical products offers greater risk of corrosion damage than the fire effluent
from other products such as furnishings, building materials, etc.
The performance of electrical and electronic components can be adversely affected by
corrosion damage when subjected to fire effluent. A wide variety of combinations of small
quantities of effluent gases, smoke particles, moisture and temperature may provide
conditions for electrical component or system failures from breakage, overheating or shorting.
Evaluation of potential corrosion damage is particularly important for high value and safety-
related electrotechnical products and installations.
Technical committees responsible for the products will choose the test(s) and specify the level
of severity.
The study of corrosion damage requires an interdisciplinary approach involving chemistry,
electricity, physics, mechanical engineering, metallurgy and electrochemistry. In the
preparation of this part of IEC 60695, all of the above have been considered.
IEC 60695-5-1 defines the scope of the guidance and indicates the field of application.
IEC 60695-5-2 provides a summary of test methods including relevance and usefulness.
___________
Numbers in square brackets refer to the bibliography.
– 8 – IEC TS 60695-5-2:2021 RLV © IEC 2021
IEC 60695-5-3 gives details of a small-scale test method for the measurement of leakage
current and metal loss caused by fire effluent.
FIRE HAZARD TESTING –
Part 5-2: Corrosion damage effects of fire effluent –
Summary and relevance of test methods
1 Scope
This part of IEC 60695, which is a technical specification, gives a summary of the test
methods that are used in the assessment of the corrosivity of fire effluent. It presents a brief
summary of test methods in common use, either as international standards or national or
industry standards. It includes special observations on their relevance, for electrotechnical
products and their materials, to real fire scenarios and gives recommendations on their use.
One of the responsibilities of a technical committee is, wherever applicable, to make use of
basic safety publications in the preparation of its publications. The requirements, test
methods or test conditions of this publication will not apply unless specifically referred to or
included in the relevant publications.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements 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.
IEC 60695-4:19932012, Fire hazard testing – Part 4: Terminology concerning fire tests for
electrotechnical products
IEC 60695-5-1:2002, Fire hazard testing – Part 5-1: Corrosion damage effects of fire effluent -
General guidance
IEC/TS 60695-5-3, Fire hazard testing – Part 5-3: Corrosion damage effects of fire effluent –
Leakage current and metal loss test method
IEC GUIDE 104:1997, The preparation of safety publications and the use of basic safety
publications and group safety publications
ISO Guide 51, Safety aspects – Guidelines for their inclusion in standards
ISO/IEC 13943:20002017, Fire safety – Vocabulary
ISO 19706:2011, Guidelines for assessing the fire threat to people
ISO/TR 9122-1:1989, Toxicity testing of fire effluents – Part 1: General
3 Terms and definitions
For the purposes of this part of IEC 60695, the definitions given in ISO/IEC 13943 and
IEC 60695-4, as well as the following definitions, apply.
___________
To be published.
– 10 – IEC TS 60695-5-2:2021 RLV © IEC 2021
For the purposes of this document, the terms and definitions given in IEC 60695-4:2012 and
ISO 13943:2017 (some of which are reproduced below), apply.
3.1
corrosion damage
physical and/or chemical damage or impaired function caused by chemical action
[SOURCE: ISO/IEC 13943:2017, definition 25 3.69]
3.2
corrosion target
sensor used to determine the degree of corrosion damage (3.1), under specified test
conditions
Note 1 to entry: This sensor may be a product, a component, or a reference material used to simulate them. It
may also be a reference material or object used to simulate the behaviour of a product or a component.
[SOURCE: ISO/IEC 13943:2017, definition 26 3.70]
3.3
critical relative humidity
level of relative humidity that causes leakage current to exceed a value defined in the product
specification
3.3
fire effluent
totality of all gases and/or aerosols, (including suspended particles) created by combustion or
pyrolysis (3.6) and emitted to the environment
[SOURCE: ISO/IEC 13943:2017, definition 45 3.123]
3.5
fire effluent decay characteristics
physical and/or chemical changes in fire effluent due to time and transport
[IEC 60695-4, definition 2.34]
3.6
fire effluent transport
movement of fire effluent away from the location of the fire
[IEC 60695-4, definition 2.35]
3.4
fire scenario
detailed description of conditions, including environmental, of one or more stages from before
ignition to after completion of combustion in an actual fire at a specific location or in a real-
scale simulation
qualitative description of the course of a fire with respect to time, identifying key events that
characterize the studied fire and differentiate it from other possible fires
Note 1 to entry: See fire scenario cluster (ISO 13943:2017, 3.154) and representative fire scenario
(ISO 13943:2017, 3.153).
Note 2 to entry: It typically defines the ignition and fire growth processes, the fully developed fire stage, the fire
decay stage, and the environment and systems that will impact on the course of the fire.
Note 3 to entry: Unlike deterministic fire analysis, where fire scenarios are individually selected and used as
design fire scenarios, in fire risk assessment, fire scenarios are used as representative fire scenarios within fire
scenario clusters.
[SOURCE: ISO/IEC 13943:2017, definition 58 3.152]
3.8
ignition source
source of energy that initiates combustion
[ISO/IEC 13943, definition 97]
3.9
leakage current
electrical current flowing in an undesired circuit
3.5
physical fire model
laboratory process, including the apparatus, the environment and the fire test procedure
intended to represent a certain phase of a fire
[SOURCE: ISO 13943:2017, 3.298]
3.6
pyrolysis
chemical decomposition of a substance by the action of heat
Note 1 to entry: Pyrolysis is often used to refer to a stage of fire before flaming combustion has begun.
Note 2 to entry: In fire science, no assumption is made about the presence or absence of oxygen.
[SOURCE: ISO 13943:2017, 3.316]
3.7
smoke
visible part of a fire effluent (3.3)
[SOURCE: ISO/IEC 13943:2017, definition 150 3.347]
4 Classification of test methods
4.1 Introduction General
Test methods can be classified according to three criteria:
a) the nature of the test specimen which is burned;
b) the physical fire model used in the test;
c) the nature of the measurement of corrosivity.
4.2 Test specimen
4.2.1 Product testing
The test specimen is a manufactured product or a representative portion of a product.
Examples include: a printed circuit board, a switchboard, a computer or a cable.
4.2.2 Simulated product testing
The test specimen is a representative portion of a product.
– 12 – IEC TS 60695-5-2:2021 RLV © IEC 2021
4.2.2 Material or composite sample testing
The test specimen is a basic material (solid or liquid), or composite of materials.
4.3 The physical fire model
Test methods use a wide variety of heat sources and geometries. The amount, the rate of
production and the corrosive nature of fire effluent released from a given material or product
is not an inherent property of that material or product, but is critically dependent on the
conditions under which that material or product is burnt. In a fire scenario or a fire test, the
chemical nature of the test specimen fuel, the decomposition temperature and the amount of
ventilation are the main variables which affect the composition of fire effluent.
It is critical to show that the test conditions defined in a standardized test method (the fire
model) are relevant to, and replicate, the desired stage of a real fire. ISO has published a
general classification of fire stages in ISO/TR 9122-1 ISO 19706, shown in Table 1. The
important factors affecting effluent production are oxygen concentration and
irradiance/temperature.
4.4 The nature of the corrosivity measurement
4.4.1 Product testing as target
In these cases the corrosion target is a manufactured product or a representative portion of
a product. Examples include: printed wiring boards, switchboards, washing machines and
computers.
The corrosion damage effects of fire effluent on the product can be assessed by
degradation of function as determined by inspection or measurement.
4.4.2 Simulated product testing as target
In these cases the corrosion target is a printed circuit or a thin metal film which simulates
a product.
When a simulated product is used as the target, the corrosion target is typically a reference
circuit, a thin sheet of metal or a metal mirror. The corrosion damage effects of fire effluent
on the target can be assessed by changes in appearance, mass or measurements of
mechanical, physical or electrical characteristics.
Table 1 – Characteristics of fire stages (from Table 1 in ISO 19706:2011)
Max. temperature Oxygen volume
Heat flux to
100×[CO2]
[CO]
fuel surface
°C % Fuel/air
([CO2]+[CO])
Fire stage equivalence
[CO2]
ratio (plume)
Fuel surface Upper layer Entrained Exhausted
kW/m
v/v
% efficiency
1 Non-flaming
a self-sustaining not
d
450 to 800 25 to 85 20 20 – 0,1 to 1 50 to 90
(smouldering) applicable
b oxidative pyrolysis
b c c
from externally applied – 300 to 600 a 20 20
< 1
radiation
c anaerobic pyrolysis
b c c
from externally applied – 100 to 500 0 0
>> 1
radiation
d e
2 Well-ventilated flaming 0 to 60 350 to 650 50 to 500 ≈ 20 ≈ 20 < 1 > 95
< 0,05
f
3 Underventilated flaming
a small, localized fire,
generally in a poorly
a
0 to 30 300 to 600 50 to 500 15 to 20 5 to 10 > 1 0,2 to 0,4 70 to 80
ventilated
compartment
g h i
b post-flashover fire 50 to 150 > 600 < 15 < 5 70 to 90
350 to 650 > 1 0,1 to 0,4
a
The upper limit is lower than for well-ventilated flaming combustion of a given combustible.
b
The temperature in the upper layer of the fire room is most likely determined by the source of the externally applied radiation and room geometry.
c
There are few data, but for pyrolysis this ratio is expected to vary widely depending on the material chemistry and the local ventilation and thermal conditions.
d
The fire’s oxygen consumption is small compared to that in the room or the inflow, the flame tip is below the hot gas upper layer or the upper layer is not yet significantly
vitiated to increase the CO yield significantly, the flames are not truncated by contact with another object, and the burning rate is controlled by the availability of fuel.
e
The ratio can be up to an order of magnitude higher for materials that are fire-resistant. There is no significant increase in this ratio for equivalence ratios up to ≈ 0,75.
Between ≈ 0,75 and 1, some increase in this ratio may occur.
f
The fire’s oxygen demand is limited by the ventilation opening(s); the flames extend into the upper layer.
g
Assumed to be similar to well-ventilated flaming.
h
The plume equivalence ratio has not been measured; the use of a global equivalence ratio is inappropriate.
i
Instances of lower ratios have been measured. Generally, these result from secondary combustion outside the room vent.
– 14 – IEC TS 60695-5-2:2021 RLV © IEC 2021
4.4.3 Indirect assessment
An indirect method of assessment is one that uses no corrosion target but measures a
characteristic of the gases and vapours evolved. For example, the amount of halogen acid
produced, or the pH and/or the conductivity of a solution in which the gases and vapours
evolved by combustion have been dissolved.
Table 1 – General classification of fire stages in accordance with ISO/TR 9122-1
Oxygen* CO /CO Temperature* Irradiance***
Fire
o 2
% ratio** C kW/m
Stage 1 Non-flaming decomposition
a) Smouldering (self- 21 Not <100 Not applicable
sustaining) applicable
b) Non-flaming (oxidative) 5 to 21 Not <500 <25
applicable
c) Non-flaming (pyrolytic) <5 Not <1 000 Not applicable
applicable
Stage 2 Developing fire (flaming) 10 to 15 100 to 200 400 to 600 20 to 40
Stage 3 Fully developed fire (flaming)
a) Relatively low ventilation 1 to 5 <10 600 to 900 40 to 70
b) Relatively high ventilation 5 to 10 <100 600 to 1 200 50 to 150
* General environmental condition (average) within compartment.
** Mean value in fire plume near to fire.
*** Incident irradiance on to sample (average)
5 Published test methods
5.1 Introduction General
The test methods reviewed in this clause were selected on the basis that they are published
in international, national or industry standards, and are in common usage in the
electrotechnical field. It is not intended to review all possible test methods.
NOTE These summaries are intended as a brief outline of the test methods and should as such not meant to be
used in place of full published standards.
5.2 Tests for the determination of halogen acid in combustion gases
5.2.1 Standards
An international standard, IEC 60754-1 [1] , and a European standard, EN 50267-2-1 [2], are
based on the method described below.
International standard IEC 60754-1 [4], which is a test on cable materials, is based on the
method described in 5.2.2 to 5.2.6.
5.2.2 Purpose and principle
The standard specifies the procedure for the determination of the amount of halogen acid gas,
other than hydrofluoric acid, evolved during the combustion of compounds based on
___________
Figures in square brackets refer to the bibliography.
halogenated polymers, and compounds containing halogenated additives, taken from cable
constructions.
For reasons of accuracy, the method is not recommended for use where the amount of
halogen acid evolved is less than 5 mg/g of the test specimen.
For reasons of precision this method is not recommended for reporting values of halogen acid
evolved less than 5 mg/g of the sample taken.
5.2.3 Test specimen
The test specimen consists of 500 mg to 1 000 mg of the material to be tested, cut into small
pieces.
The test specimen has a mass of between 0,5 g to 1,0 g cut into a number of small pieces.
5.2.4 Test method
The test specimen is heated in a tube furnace in a stream of air. The temperature of the test
specimen is raised at a uniform rate to 800 °C over a time of 40 min and held at 800 °C for
20 min. The air flow is 0,0157 × (D/mm) litres per hour (where D is the diameter of the
–1 –1
furnace tube) so as to give an air velocity in the tube of 20 m × h (0,56 cm × s ). At the exit
of the tube the gases produced by the thermal decomposition of the test specimen pass
through two wash bottles each containing at least 220 ml of 0,1 M sodium hydroxide solution
so that any acid gases are absorbed by the alkaline solution. The amount of halogen acid,
expressed as hydrochloric acid, is found by titration with silver nitrate and ammonium
thiocyanate.
5.2.5 Repeatability and reproducibility
No interlaboratory test data are currently available.
5.2.6 Relevance of test data to corrosion hazard assessment
The method is intended for the type testing of individual components used in cable
construction. It is an analytical chemistry test for halogen acid (other than hydrofluoric acid)
and does not directly measure corrosion damage. It is known that halogen acids cause
corrosion, but many other chemical species are also corrosive and these will not be detected
by this test. A high halogen acid production will therefore indicate a high corrosive potential,
but a low halogen acid content will not necessarily mean a low corrosive potential.
The combustion conditions used in this test are designed to maximize the halogen acid
production from materials which contain halogen. They are not designed to model any
particular stage of a fire, but they most closely correspond to stage 1c of Table 1, i.e. non-
flaming pyrolytic decomposition.
5.3 Tests for the determination of the acidity and conductivity of combustion gases
dissolved in an aqueous solution
5.3.1 Standards
One international standard, IEC 60754-2 [5], two European standards, EN 50267-2-2 [4] and
EN 50267-2-3 [5], and many national standards, for example, CAN/CSA C22.2 [6], DIN
VDE 0472-Part 813 [7] and NF C 20-453 [8], are based on the method described in 5.3.2 to
5.3.6.
Annex A lists differences between some of these methods.
– 16 – IEC TS 60695-5-2:2021 RLV © IEC 2021
5.3.2 Purpose and principle
Fire effluent, evolved from the pyrolysis or combustion of a test specimen, is bubbled
through distilled or demineralized water. The pH, or pH and conductivity, of the resulting
aqueous solution is then measured.
Such an assessment has the advantage of being both relatively simple and cheap, but has the
disadvantage that it does not directly measure corrosion damage. An assumption is made
that a certain level of the measured parameter will correspond to an unacceptable corrosive
potential. This will be valid for a given scenario only if independent measurements have been
made to establish such a correlation.
5.3.3 Test specimen
The test specimen typically has a mass of 0,5 g or about 1,0 g cut into a number of small
pieces.
5.3.4 Test method
An annular furnace is set to a temperature specified in the relevant standard of between
750 °C and 950 °C. The test specimen is located in a porcelain boat inside a quartz glass
combustion tube within the furnace. Air is injected upstream of combustion and the
combustion gases are bubbled through wash bottles containing distilled or demineralized
water.
5.3.5 Repeatability and reproducibility
Repeatability and reproducibility have been determined during interlaboratory trials used to
develop the French standard, NF C 20-453:
– repeatability: 4 % to 7 %;
– reproducibility: 9 % to 11 %.
The values depend on test conditions and materials (see Annex B).
5.3.6 Relevance of test data to corrosion hazard assessment
For strong acids and bases, it is known by experience that within a generically similar family
of materials the acid/basic gas test can rank materials in the order of their corrosive potential
towards a given substrate. It is also known by experience that this may not be true in
comparing different families of materials. It is also known by experience that the corrosive
potential of an aqueous medium is related to its electrical conductivity.
5.4 Tests for the determination of corrosive gases by using
the copper mirror test in ASTM D 2671-00 [9] evaluation of copper corrosion in
ASTM D 2671 – Sections 89 to 95 [9]
5.4.1 Purpose and principle
This test is performed on heat-shrinkable insulating tubing. The test method is used to detect
material liable to evolve corrosion products when heated to elevated temperatures. The
evolved products condense on to a copper mirror which is subsequently examined for
corrosion damage.
Three tests are described for heat-shrinkable insulating tubing. Procedure A is a non-contact
test using a copper mirror at elevated temperature. Procedure B is contact corrosion with
heat. Procedure C is a cyclical-corrosion test using humidity and copper dust.
5.4.2 Test specimen
The test specimens are cut from the tubing (strips which have a total outside area of about
150 mm if the diameter is less than 10,2 mm; a 6 mm × 25 mm strip if the diameter is greater
than or equal to 10,2 mm).
5.4.3 Test methods
a) Procedure A
Metal mirrors are used as targets. These are 25 mm long by 6 mm wide. The mirror is
vacuum deposited copper with a thickness which gives between 5 % and 15 %
transmission of normal incident light of wavelength 500 nm. Corrosion is considered to be
removal of the copper and is measured as the percentage of the original coated area
which has become transparent. The copper mirror is prepared by depositing copper on a
previously cleaned plate of glass in a vacuum. The test pieces are placed in the bottom of
a dry test tube, the lower part of which is immersed in an oil bath at the temperature and
time specified in the specification. The copper mirror, suspended inside this tube and kept
at a temperature of less than 60 °C throughout the test, is used to assess the corrosivity of
the products evolved.
b) Procedure B
Tubing is slid over bare copper conductors that are then heated under specified
conditions. Afterwards the tubing is slit open and the copper is examined pitting and
blackening.
c) Procedure C
Tubing is dusted with powdered copper and then temperature cycled under specified
conditions. After this heat treatment the copper is examined for any evidence of extensive
green or brown discolouration.
5.4.4 Special observations
These methods is are qualitative. Preparation of the copper mirror is a delicate operation (see
ASTM D 2671, sections 85 to 95 [9]). A test duration of 16 h is usually sufficient to determine
whether the material is corrosive or not under the conditions of the test. The degradation of
the test specimen corresponds to stage 1b of Table 1, i.e. non-flaming oxidative
decomposition.
5.4.5 Repeatability and reproducibility
No interlaboratory test results are currently available.
5.4.6 Relevance of test data to corrosion hazard assessment
The test method indicates the potential of a test specimen to generate species capable of
corroding copper when undergoing non-flaming oxidative decomposition.
5.5 Static method (ISO 11907-2 [10])
5.5.1 Purpose and principle
This test is used to assess the potential corrosivity of effluents evolved during combustion of
a 600 mg test specimen in a 20 l cylindrical sealed chamber. Corrosivity is assessed
by measuring the variation in the resistance of a copper printed wiring board (PWB).
This variation is due to the corrosive action of effluents condensing on the board. The test is
intended to reproduce a defined stage in an actual fire, that is, the combustion of material
followed by the condensation of the effluents on a cooled surface.
– 18 – IEC TS 60695-5-2:2021 RLV © IEC 2021
5.5.2 Test specimen
A minimum quantity of 3 g is used to allow five tests to be carried out on individual test
specimens of 600 mg ± 2 mg of material. The test specimens are in the form of granules or
chips to ensure intimate contact with the ignition source.
5.5.3 Corrosion damage detector
The corrosion damage detector is a copper printed wiring board with a serpentine geometry.
The target, shown in Figure 1, is made by etching a copper-plated laminate base to provide
36 conductor tracks each 52 mm long, 0,3 mm wide and 17 µm thick, with a spacing of
0,3 mm. The resistance of the circuit is 8,0 Ω ± 0,5 Ω.
Condensed combustion products react with the copper if they are corrosive and the corrosion
damage is assessed by measurement of the resistance variation due to attack on the copper
circuit. The corrosion damage is expr
...
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