ISO 6021:2024

International
Standard
ISO 6021
First edition
Firebrand generator
PROOF/ÉPREUVE
Reference number
ISO 6021:2024(en) © ISO 2024

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ISO 6021:2024(en)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
PROOF/ÉPREUVE
© ISO 2024 – All rights reserved
ii

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ISO 6021:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Importance of firebrand showers on ignition processes . 2
5 Experimentally simulated firebrand showers . 3
5.1 General .3
5.2 Description of an ISO Standard Firebrand Generator .3
5.2.1 General .3
5.2.2 Principles of operation of the ISO Standard Firebrand Generator .4
6 Operation requirements and guidance . 6
7 Reproducibility . 7
Annex A (informative) Alternative methods of firebrand generation . 8
Bibliography . 9
PROOF/ÉPREUVE
© ISO 2024 – All rights reserved
iii

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ISO 6021:2024(en)
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part
...

ISO DIS/PRF 6021:2023(E)
ISO /TC 92/WG14
Date: 2023-01-27
Secretariat: ANSIBSI
Date: 2024-01-10
Firebrand generator
PROOF

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ISO/DISPRF 6021:20222024(E)
© ISO 20232024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this
publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical,
including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can
be requested from either ISO at the address below or ISO'sISO’s member body in the country of the requester.
ISO Copyright Officecopyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: copyright@iso.org
E-mail: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland.
ii © ISO 2022 – All rights reserved
© ISO 2024 – All rights reserved

ii

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ISO/DISPRF 6021:20222024(E)
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Importance of firebrand showers on ignition processes. 2
5 Experimentally simulated firebrand showers . 4
5.1 General . 4
5.2 Description of an ISO Standard Firebrand Generator . 5
5.2.1 General . 5
5.2.2 Principles of operation of the ISO Standard Firebrand Generator . 5
6 Operation requirements and guidance . 9
7 Reproducibility . 10
Annex A (informative) Alternative methods of firebrand generation . 12
A.1 Review of methods for generating firebrands in fire tests . 12
A.1.1 Wooden cribs . 12
Bibliography . 13

Foreword 4
Introduction 5
1 Scope 5
2 Normative references 5
3 Terms and definitions 5
4 Importance of firebrand showers on ignition processes 7
5 Experimentally simulated firebrand showers 8
5.1 General 8
5.2 Description of ISO Standard Firebrand Generator 8
5.2.1 Principles of operation of the ISO Standard Firebrand Generator 9
6 Operation requirements and guidance 10
7 Reproducibility 11
Annex A (informative) Alternative methods of firebrand generation 12
A.1 Review of methods for generating firebrands in fire tests 12
A.1.1 Wooden cribs 12
Bibliography 13
© ISO 2022 – All rights reserved iii
© ISO 2024 – All rights reserved

iii

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ISO/DISPRF 6021:20222024(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 com
...