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IEC 60695-2-12
Edition 3.0 2021-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
HORIZONTAL PUBLICATION
Fire hazard testing –
Part 2-12: Glowing/hot-wire based test methods – Glow-wire flammability index
(GWFI) test method for materials
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IEC 60695-2-12
Edition 3.0 2021-10
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
HORIZONTAL PUBLICATION
Fire hazard testing –
Part 2-12: Glowing/hot-wire based test methods – Glow-wire flammability index
(GWFI) test method for materials
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.220.40; 29.020 ISBN 978-2-8322-4436-4
– 2 – IEC 60695-2-12:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 3
INTRODUCTION . 2
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Test specimens . 7
4.1 Test specimen preparation . 8
4.2 Test specimen dimensions . 8
4.3 Testing ranges in formulations . 9
4.3.1 General . 9
4.3.2 Density, melt flows and filler/reinforcement . 9
4.3.3 Colour . 9
5 Apparatus . 9
6 Temperature measuring system verification . 9
7 Conditioning and test conditions . 10
7.1 Conditioning of test specimens . 10
7.2 Conditioning of the wrapping tissue and the wooden board . 10
7.3 Testing conditions . 10
8 Test procedure . 10
8.1 General . 10
8.2 Initial test temperatures . 10
8.3 Test temperatures . 11
9 Observations and measurements . 11
9.1 General .
9.1 Initial observations . 11
9.2 Test observations . 12
10 Evaluation of test results . 12
10.1 Test criteria . 12
10.2 Glow-wire flammability index . 12
11 Test report . 13
Bibliography . 14
Table 1 – Initial test temperatures . 11
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIRE HAZARD TESTING –
Part 2-12: Glowing/hot-wire based test methods –
Glow-wire flammability index (GWFI) test method for materials
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
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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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 60695-2-12:2010+AMD1:2014 CSV. A vertical bar
appears in the margin wherever a change has been made. Additions are in green text,
deletions are in strikethrough red text.
– 4 – IEC 60695-2-12:2021 RLV © IEC 2021
IEC 60695-2-12 has been prepared by IEC technical committee 89: Fire hazard testing. It is
an International Standard.
This third edition cancels and replaces the second edition published in 2010 and
Amendment 1:2014. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) New terms and definitions with regards to times and durations have been added to
Clause 3, with an effect on the application of the test method.
The text of this International Standard is based on the following documents:
FDIS Report on voting
89/1537/FDIS 89/1545/RVD
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 International Standard 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 /members_experts/refdocs. The main document types developed by
IEC are described in greater detail at /standardsdev/publications.
It has the status of a basic safety publication in accordance with IEC Guide 104.
This standard is to be used in conjunction with IEC 60695-2-10.
A list of all the parts in the IEC 60695 series, under the general title Fire hazard testing, can
be found on the IEC web site.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://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
In the design of any 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 product design, as well as the choice of materials, is to reduce to acceptable levels the
potential risks of fire during normal operating conditions, reasonable foreseeable abnormal
use, malfunction and/or failure. IEC 60695-1-10 [1] , together with its companion
IEC 60695-1-11 [2], has been developed to provide guidance on how this is to be
accomplished.
The primary aims of IEC 60695-1-10 and IEC 60695-1-11 are to provide guidance on how to:
a) prevent ignition caused by an electrically energized component part, and
b) confine any resulting fire within the bounds of the enclosure of the electrotechnical
product in the event of ignition.
Secondary aims of IEC 60695-1-10 and IEC 60695-1-11 include the minimization of any flame
spread beyond the product’s enclosure and the minimization of the harmful effects of fire
effluents such as heat, smoke, toxicity and/or corrosivity.
Fires involving electrotechnical products can also be initiated from external non-electrical
sources. Considerations of this nature should be are normally dealt with in the overall fire
hazard assessment.
In electrotechnical equipment, overheated metal parts can act as ignition sources. In glow-
wire tests, a red-hot glowing wire is used to simulate such an ignition source.
...