ISO/FDIS 23693-2
(Main)Determination of the resistance to gas explosions of passive fire protection materials — Part 2: Divisional substrates
Determination of the resistance to gas explosions of passive fire protection materials — Part 2: Divisional substrates
ISO 23693 part 1 aims to simulate the mechanical loads that could be imparted to passive fire protection (PFP) materials and systems by explosions resulting from the ignition of releases of flammable gas, pressurised liquefied gas, flashing liquid fuels or dust that may precede a fire. Explosions can give rise to pressure and drag forces. Damage to PFP materials and systems in an explosion can be caused by the direct effects of pressure and drag loadings and by the resulting distortion of the substrate supporting the PFP material. This part of the ISO 23693 series deals with tests to assess the performance of PFP materials applied to panels, plates etc that could be used as divisional elements. The loading on this type of element predominantly results from the explosion pressure applied and drag loadings are typically minimal.
Titre manque — Partie 2: Titre manque
General Information
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Standards Content (Sample)
FINAL DRAFT
International
Standard
ISO/TC 92/SC 2
Determination of the resistance
Secretariat: ANSI
to gas explosions of passive fire
Voting begins on:
protection materials —
2025-12-23
Part 2:
Voting terminates on:
2026-02-17
Divisional substrates
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 92/SC 2
Determination of the resistance
Secretariat: ANSI
to gas explosions of passive fire
Voting begins on:
protection materials —
Part 2:
Voting terminates on:
Divisional substrates
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
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 Reference number
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Types of pressure loading from explosions . 2
5 Generation of pressure loading. 2
6 Test specimens . 2
6.1 General .2
6.2 PFP test panels . . .2
6.3 Representative specimens .3
7 Environmental conditions . 4
8 Instrumentation . 4
9 Test specification . 4
10 Data analysis . 5
10.1 Overpressure data analysis .5
10.2 Panel response — PFP test panels .5
10.2.1 Elastic response — maximum displacement .5
10.2.2 Plastic response — support rotation .5
11 Specimen rating . 5
11.1 PFP test panel .5
11.2 Representative specimen .6
12 Validity of test . 6
12.1 General .6
12.2 Tests with PFP test panels .6
12.3 Tests with representative samples .6
13 Test report . 6
Annex A (informative) Calculation of pressure build-up in supporting construction . 8
Annex B (informative) Calculation of maximum dynamic displacement from measured
permanent displacement .10
Annex C (normative) Description of damage to PFP .12
Bibliography . 14
iii
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 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 92, Fire Safety, Subcommittee SC 2, Fire
Resistance.
A list of all parts in the ISO 23693 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
FINAL DRAFT International Standard ISO/FDIS 23693-2:2025(en)
Determination of the resistance to gas explosions of passive
fire protection materials —
Part 2:
Divisional substrates
1 Scope
This document describes methods for simulating the mechanical loads that can be imparted to passive fire
protection (PFP) materials and systems by explosions resulting from releases of flammable gas, pressurized
liquefied gas, flashing liquid fuels, or dust that can precede a fire.
These methods can be used to determine the resistance of passive fire protection materials to such events.
This document considers PFP materials applied to panels, plates, etc. that can be used as divisional elements.
The loading on this type of element predominantly results from explosion overpressure applied and drag
loadings are typically minimal.
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.
ISO 23693-1:2021, Determination of the resistance to gas explosions of passive fire protection materials — Part
1: General requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
ductility ratio
ratio of the maximum dynamic displacement of a panel divided by the displacement at its yield stress
3.2
duration
time for the overpressure in a blast wave to rise to the peak pressure and return to zero
3.3
fixed support
fixation that provides full resistance to force and moments at the edge of the panel
3.4
overpressure
difference between actual pressure and ambient pressure
3.5
rise time
time for the pressure in a blast wave to rise to the peak overpressure
4 Types of pressure loading from explosions
Explosions can give rise to pressure and drag forces. Damage to PFP materials and systems in an explosion
can be caused by the direct effects of pressure and drag loadings and by the distortion of the substrate
supporting the PFP material.
Types of explosion loading are described in ISO 23693-1. For the panel specimens that are considered in this
document, loading is predominantly pressure loading and any drag load will be minimal. Damage to the
PFP applied to the panel specimen often results from the distortion of the panel from the explosion loading
rather than directly from the pressure loading. Annex C includes a list of damage descriptions.
Test laboratories should be aware of the significant potential hazards involved in gas explosion resistance
testing and take appropriate steps to ensure the safety of all concerned.
5 Generation of pressure loading
Methods for generating an explosion load are described in ISO 23693-1.
6 Test specimens
6.1 General
Two types of specimens are considered in this document:
a) PFP test panel: These are panels that are used to assess the performance of PFP systems. Panels shall be
designed to provide a certain level of response based on support rotation. PFP test panels are typically
used to assess the performance of PFP systems that are directly adhered to their substrates, such as
coatings.
b) Representative specimens: These are panels that are representative of those intended to be installed or
actually installed in an installation. The test assesses the performance of the complete panel, including
its attachments to the surrounding structure, and the PFP materials that are attached to it.
6.2 PFP test panels
If a panel is being used only to assess the ability of a PFP system applied to it to survive a blast loading,
then a suitable test panel shall be designed that provides the required level of response based on support
rotation; see 11.1. The required response is defined as a support rotation at the panel supports.
A test panel shall:
— have minimum width of 1,0 m and span between supports measuring between 1,0 m and 2,0 m;
— be a flat uniform plate with no added stiffening;
— have fixed supports with uniform cross section over the span;
— be supported along two parallel edges;
— be fabricated from material representative of the material used for the structure onto which it is intended
to apply the PFP system in service;
— have a design that is recorded in the test report;
— have a known yield stress that is recorded in the test report;
— have PFP installed upon it that is representative of the PFP material or system used in practice.
When test panels are mounted in a supporting structure placed inside an explosion, that supporting
structure shall not move under the blast overpressure. The maximum displacement under test conditions
shall not exceed 1 % of the height of the structure. The structure behind the test panel shall be sealed to
prevent the overpressure wave from wrapping around the panel.
Alternatively, the PFP test panel may be mounted in front of or into the wall of an explosion chamber. In
this case, panels shall be mounted with sufficient clearance behind them so that the displacement of the
specimen is not limited by impacting with the explosion chamber structure. The joint between the specimen
and the wall shall be sealed to prevent ingress of gas behind the specimen. If there is an enclosed void behind
the specimen the void shall be vented to the outside.
The pressure loading shall be measured by a minimum of three pressure transducers. When the test panel
is mounted within an explosion chamber, the pressure transducers shall be located within 1,0 m vertically
or horizontally of the panel being tested. If the specimen is mounted outside an explosion chamber or
an unconfined gas explosion the test panel shall be supported on a suitable structure and the pressure
transducers shall be located around the specimen as shown in Figure 1.
6.3 Representative specimens
“Representative specimens” are replicas of walls, floors, ceiling or bulkheads, etc., either acting as part of
the structure or separately mounted in a suitable structure.
The test of
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ISO /TC 92/SC 2/WG 11
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Date: 2025-10-06
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Secretariat: ANSI
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Date: 2025-12-08
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Determination of the resistance to gas explosions of passive fire
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protection materials — —
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Part 2:
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Divisional substrates
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St l D fi iti
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All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
Adjust space between Asian text and numbers
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
Formatted: French (France)
EmailE-mail: copyright@iso.org
Formatted: French (France)
Website: www.iso.orgwww.iso.org
Formatted: French (France)
Published in Switzerland
Formatted: FooterPageRomanNumber
ii
ISO/DISFDIS 23693-2:20242025(en) Formatted: Font: 11 pt, Bold, Font color: Auto
Formatted: Font: 11 pt, Bold, Font color: Auto
Formatted: Font: 11 pt, Bold, Font color: Auto
Contents
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Foreword . v
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1 Scope . 1
Adjust space between Asian text and numbers
2 Normative references . 1
3 Terms and definitions . 1
4 Types of pressure loading from explosions . 2
5 Generation of pressure loading . 2
6 Test specimens . 2
6.1 General. 2
6.2 PFP test panels . 2
6.3 Representative specimens . 3
7 Environmental conditions . 5
8 Instrumentation . 5
9 Test specification . 5
10 Data analysis . 6
10.1 Overpressure data analysis . 6
10.2 Panel response — PFP test panels . 6
11 Specimen rating . 7
11.1 PFP test panel . 7
11.2 Representative specimen . 7
12 Validity of test . 8
12.1 General. 8
12.2 Tests with PFP test panels . 8
12.3 Tests with representative samples . 8
13 Test report . 8
Annex A (informative) Calculation of pressure build-up in supporting construction . 10
Annex B (informative) Calculation of maximum dynamic displacement from measured
permanent displacement . 14
Annex C (normative) Description of damage to PFP . 16
Bibliography . 18
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
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3.1 ductility ratio . 1
3.2 duration . 1
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3.3 fixed supports . 1
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3.4 overpressure . 1
Tab stops: Not at 17.2 cm
3.5 rise time . 1
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4 Types of pressure loading from explosions . 2
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5 Generation of pressure loading . 2
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iii
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6 Test specimens . 2
6.1 PFP test panels . 2
6.2 Representative specimens . 3
7 Environmental conditions . 4
8 Instrumentation . 4
9 Test specification . 4
10 Data analysis . 5
10.1 Overpressure data . 5
10.2 Panel response – PFP test panels . 5
10.2.1 Elastic response – maximum displacement . 5
10.2.2 Plastic response – support rotation . 5
11 Specimen rating . 5
11.1 PFP test panel . 5
11.2 Representative specimen . 6
12 Validity of test . 6
12.1 Tests with PFP test panels . 6
12.2 Tests with representative samples . 6
13 Test report . 6
Annex A (informative) Calculation of pressure build-up in supporting construction . 8
Annex B (normative) Calculation of maximum dynamic displacement from measured
permanent displacement . 11
Annex C (normative) Description of damage to PFP . 13
Bibliography . 15
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iv
ISO/DISFDIS 23693-2:20242025(en) Formatted: Font: 11 pt, Bold, Font color: Auto
Formatted: Font: 11 pt, Bold, Font color: Auto
Formatted: Font: 11 pt, Bold, Font color: Auto
Foreword
Formatted: Font: Bold
ISO (the International Organization for Standardization) is a worldwide federation of national standards Formatted: HeaderCentered, Left
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
Formatted: Adjust space between Latin and Asian text,
ISO technical committees. Each member body interested in a subject for which a technical committee has been
Adjust space between Asian text and numbers
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 1. In particular, the different approval criteria needed for the different types of
ISO documentsdocument should be noted. This document was drafted in accordance with the editorial rules
of the ISO/IEC Directives, Part 2 (see www.iso.org/directives 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents.www.iso.org/patents. ISO shall not be held responsible for identifying any or all such
patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.htmlwww.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 92, Fire Safety, Subcommittee SC 2, Fire
Formatted: Font: Italic
ContainmentResistance.
Formatted: Font: Italic
A list of all parts in the ISO 23693 series can be found on the ISO website.
Formatted: Default Paragraph Font
Formatted: Default Paragraph Font
Any feedback or questions on this document should be directed to the user’s national standards body. A
Formatted: Default Paragraph Font
complete listing of these bodies can be found at www.iso.org/members.htmlwww.iso.org/members.html.
Formatted: Font: 10 pt
Formatted: Font: 10 pt
Formatted: FooterCentered, Left, Space Before: 0 pt,
Tab stops: Not at 17.2 cm
Formatted: Font: 11 pt
Formatted: FooterPageRomanNumber, Left, Space
After: 0 pt, Tab stops: Not at 17.2 cm
v
DRAFT International Standard ISO/DIS 23693-2:2024(en)
Formatted: Left
Determination of the resistance to gas explosions of passive fire
protection materials — —
Formatted: Main Title 2, Adjust space between Latin
Part 2:
and Asian text, Adjust space between Asian text and
Divisional substrates
numbers
1 Scope
This document describes methods for simulating the mechanical loads that couldcan be imparted to passive
fire protection (PFP) materials and systems by explosions resulting from releases of flammable gas,
pressurized liquefied gas, flashing liquid fuels, or dust that can precede a fire.
These methods can be used to determine the resistance of passive fire protection materials to such events.
This standarddocument considers PFP materials applied to panels, plates, etc. that couldcan be used as
divisional elements. The loading on this type of element predominantly results from explosion overpressure
applied and drag loadings are typically minimal.
2 Normative references
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
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.
ISO 23693--1:2021, Determination of the resistance to gas explosions of passive fire protection materials —
Formatted: Default Paragraph Font
Part 1: General requirements
Formatted: Default Paragraph Font
Formatted: Default Paragraph Font
3 Terms and definitions
Formatted: Default Paragraph Font
For the purposes of this document, the following terms and definitions apply.
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers, Tab
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
— — ISO Online browsing platform: available at https://www.iso.org/obphttps://www.iso.org/obp
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
— — IEC Electropedia: available at https://www.electropedia.org/https://www.electropedia.org/
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3.1 3.1
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ductility ratio stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
ratio of the maximum dynamic displacement of a panel divided by the displacement at its yield stress 3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
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3.2 3.2
and Asian text, Adjust space between Asian text and
duration
numbers
time for the overpressure in a blast wave to rise to the peak pressure and return to zero
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spacing: single, Tab stops: Not at 17.2 cm
Formatted: Font: Bold
Formatted: HeaderCentered
3.3 3.3
fixed support
fixation that provides full resistance to force and moments at the edge of the panel.
3.4 3.4
overpressure
difference between actual pressure and ambient pressure
3.5 3.5
rise time
time for the pressure in a blast wave to rise to the peak overpressure
4 Types of pressure loading from explosions
Explosions can give rise to pressure and drag forces. Damage to PFP materials and systems in an explosion
can be caused by the direct effects of pressure and drag loadings and by the distortion of the substrate
supporting the PFP material.
Types of explosion loading are described in ISO 23693-1. For the panel specimens that are considered in this
part of the ISO 23693 seriesdocument, loading will beis predominantly pressure loading and any drag load
will be minimal. Damage to the PFP applied to the panel specimen will often resultresults from the distortion
of the panel from the explosion loading rather than directly from the pressure loading. Annex CAnnex C
includes a list of damage descriptions.
Test laboratories should be aware of the significant potential hazards involved in gas explosion resistance
testing and take appropriate steps to ensure the safety of all concerned.
5 Generation of pressure loading
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
Methods for generating an explosion load are described in ISO 23693-1.
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6 Test specimens
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6.1 General
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Two types of specimens are considered in this document:
stops: Not at 0.71 cm
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a) a) PFP test panel: These are panels that are used to assess the performance of PFP systems. Panels
Adjust space between Asian text and numbers
shall be designed to provide a certain level of response based on support rotation. PFP test panels are
typically used to assess the performance of PFP systems that are directly adhered to their substrates, such Formatted: Font: Not Bold
as coatings.
Formatted: List Number 1, Numbered + Level: 1 +
Numbering Style: a, b, c, … + Start at: 1 + Alignment:
b) b) Representative specimens: These are panels that are representative of those intended to be
Left + Aligned at: 0 cm + Indent at: 0 cm
installed or actually installed in an installation. The test will assessassesses the performance of the
Formatted: Font: Not Bold
complete panel, including its attachments to the surrounding structure, and the PFP materials that are
attached to it.
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers, Tab
6.2 PFP test panels
stops: Not at 0.71 cm
If a panel is being used only to assess the ability of a PFP system applied to it to survive a blast loading, then a Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
suitable test panel shall be designed that provides the required level of response based on support rotation;
see 11.1.11.1. The required response is defined as a support rotation at the panel supports.
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ISO/DISFDIS 23693-2:20242025(en) Formatted: Font: 11 pt, Bold, Font color: Auto
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A test panel shall:
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•— have minimum width of 1,0 m and span between supports measuring between 1,0 m and 2,0 m,;
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Formatted: List Continue 1, No bullets or numbering,
•— be a flat uniform plate with no added stiffening,;
Adjust space between Latin and Asian text, Adjust space
between Asian text and numbers
•— have fixed supports with uniform cross section over the span;
•— be supported along two parallel edges. ;
•— be fabricated from material representative of the material used for the structure onto which it is intended
to apply the PFP system in service. ;
•— have a design that is recorded in the test report, ;
•— have a known yield stress that is recorded in the test report.;
•— Havehave PFP installed upon it that is representative of the PFP material/ or system used in practice.
When test panels are mounted in a supporting structure placed inside an explosion, that supporting structure
Formatted: Adjust space between Latin and Asian text,
mustshall not move under the blast overpressure. The maximum displacement under test conditions shall not
Adjust space between Asian text and numbers
exceed 1 % of the height of the structure. The structure behind the test panel shall be sealed to prevent the
overpressure wave from wrapping around the panel.
Alternatively, the PFP test panel may be mounted in front of or into the wall of an explosion chamber. In this
case, panels shall be mounted with sufficient clearance behind them so that the displacement of the specimen
is not limited by impacting with the explosion chamber structure. The joint between the specimen and the
wall shall be sealed to prevent ingress of gas behind the specimen. If there is an enclosed void behind the
specimen the void shall be vented to the outside.
The pressure loading shall be measured by a minimum of three pressure transducers. When the test panel is
mounted within an explosion chamber, the pressure transducers shall be located within 1,0 m vertically or
horizontally of the panel being tested. If the specimen is mounted outside an explosion chamber or an
unconfined gas explosion the test panel shall be supported on a suitable structure and the pressure
transducers shall be located around the specimen as shown in Figure 1.Figure 1.
6.3 Representative specimens
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers, Tab
“Representative specimens” are replicas of walls, floors, ceiling or bulkheads, etc., either acting as part of the
stops: Not at 0.71 cm
structure or separately mounted in a suitable structure.
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
The test of a representative specimen will assessassesses the mechanical performance of the complete
specimen including the PFP materials attached to it. The specimen shall be tested at full scale. If the specimen
cannot be tested at full scale, the largest specimen shall be tested. Test specimens shall include all relevant
features.
Formatted: Font: 10 pt
The structure behind the representative specimen willshall be sealed to prevent the overpressure wave from
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wrapping around the specimen and shall be of sufficient volume to ensure that the pressure build–up behind
the specimen due to the distortion of the specimen is less than 10 % of the peak test pressure. Annex AAnnex A Formatted: FooterCentered, Left, Space Before: 0 pt,
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describes how to calculate the potential pressure build-up inside the supporting structure. Alternatively, the
geometry of the test specimen can be such that the structure behind the sample does not need to be sealed; in
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this case the pressure behind the specimen mustshall be measured to ensure that it does not exceed 10 % of
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the peak test pressure.
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If in the real-world installation of a representative specimen it is mounted so that pressure loading can wrap
around the specimen or the specimen is porous allowing passage of the pressure wave, then there would beis
no need to seal the structure behind the representative specimen.
The representative specimen may also be mounted in front of, or in the wall of, an explosion chamber,
provided the attachments to the surrounding structure are representative of in-service use. In this case
specimens shall be mounted with sufficient clearance behind them so that the displacement of the specimen
is not limited by impacting with the explosion chamber structure. The joint between the specimen and the
wall of the explosion chamber will be sealed to prevent ingress of flammable gas behind the specimen. The
void behind the specimen shall have a vent opening to the outside, sized to prevent pressure build-up behind
the specimen.
The pressure loading shall be measured by a minimum of three pressure transducers. When the
representative specimen is mounted within an explosion chamber the pressure transducers shall be located
within 1,0 m of the specimen being tested. If the representative specimen is mounted outside an explosion
chamber or an unconfined gas explosion, the specimen mustshall be supported on a suitable structure and the
pressure transducers will be located around the specimen analogously to Figure 1.Figure 1.
The performance of a representative specimen during a test can be monitored using high speed video, strain
gauges or measurement of dynamic displacement as required by the test sponsor.
If additional pressure transducers are used, they shall be located within 100 mm of the locations shown in
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Figure 1.Figure 1.
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numbers, Tab stops: Not at 0.7 cm + 1.4 cm + 2.1 cm
+ 2.8 cm + 3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3
cm + 7 cm
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ISO/DISFDIS 23693-2:20242025(en) Formatted: Font: 11 pt, Bold, Font color: Auto
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Dimensions in millimetres
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stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
1 Representative specimen or test panel
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
2 Support structure
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3 Pressure transducer
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numbers
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1 representative specimen or test panel Adjust space between Asian text and numbers
2 support structure
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3 pressure transducer
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Figure 1 — Location of pressure transducers
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7 Environmental conditions
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The requirements of ISO 23693-1:2021 clause , Clause 6 shall be applicable.
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8 Instrumentation
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Instrumentation shall be as described in ISO 23693-1:2021 clause , Clause 7. In addition, the dynamic
displacement of the panel shall be measured using dynamic displacement transducer(s), types of transducers Formatted: Default Paragraph Font
that are suitable include linear displacement transducers and laser displacement transducers, or
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