SIST EN 15254-5:2026
(Main)Extended application of results from fire resistance tests - Non-loadbearing walls - Part 5: Metal sandwich panel construction
General Information
- Abstract
This document defines rules for extended applications, provides guidance, and, where appropriate, defines procedures, for variations of certain parameters and factors associated with the design of internal and external non-loadbearing walls constructed of metal sandwich panels and that have been tested in accordance with EN 1364 1, which could generate a classification in accordance with EN 13501 2.
This document applies for double skin metal faced sandwich panels having an insulating core bonded to both facings as defined in EN 14509 not stabilizing a whole building or parts of it.
- Status
- Published
- Public Enquiry End Date
- 27-Feb-2025
- Publication Date
- 17-Aug-2026
- Technical Committee
- POZ - Požarna varnost
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 30-Jul-2026
- Due Date
- 04-Oct-2026
- Completion Date
- 18-Aug-2026
Overview
SIST EN 15254-5:2026 provides standardized procedures for the extended application of fire resistance test results for internal and external non-loadbearing walls constructed from metal sandwich panels. Developed by the Slovenian Institute for Standardization (SIST) and aligned with European norms, this part of the EN 15254 series establishes rules, guidance, and defined processes for safely extending the tested fire performance to a broader range of construction variations. This standard applies to double skin metal-faced panels with an insulating core bonded to both facings, as specified in EN 14509.
The document is essential for professionals who specify, design, manufacture, or assess the fire safety of buildings using non-loadbearing metal sandwich panel wall systems, ensuring predictable fire resistance based on proven test procedures and classifications.
Key Topics
- Scope of Extended Applications: Guidance on varying product parameters while maintaining credibility of fire resistance classifications, referencing test standards EN 1364-1 for non-loadbearing elements and EN 13501-2 for fire performance classification.
- Material Variations: Rules concerning acceptable changes in:
- Metal facings (type, thickness, coatings)
- Core materials (mineral wool, polyurethane, etc.)
- Adhesives used between core and facings
- Constructional Adjustments: Defined limits and procedures for permissible changes in:
- Span length and panel orientation
- Joint construction and width/thickness
- Fixing systems and boundary conditions
- Fire Testing and Calculation: Requirements for reference tests, calculation of extended fields, and assessment protocols for variations not directly tested.
- Assumptions and Limitations: The standard outlines necessary assumptions regarding boundary conditions, structural support, and fire exposure during both testing and end-use conditions.
Applications
SIST EN 15254-5:2026 is highly relevant for:
- Product Manufacturers: Enables manufacturers to demonstrate compliance and extend fire resistance certifications for product ranges without disproportionately increasing testing costs, benefiting product development and market reach.
- Designers and Specifiers: Allows architects and engineers to confidently select metal sandwich panel wall systems for internal partitions and external cladding, knowing they meet stringent fire safety criteria-even when there are reasonable variations from strictly tested configurations.
- Testing Laboratories and Assessors: Offers a clear framework for evaluating extended field of application based on existing test data, streamlining reporting and regulatory approval processes.
- Regulatory and Compliance Bodies: Supports effective building code enforcement and harmonized safety standards within the European construction market.
The standard ensures that deviations such as increased panel thickness, changes in colors or coatings, or adjustments in span length do not compromise the safety performance efficacy of wall systems, provided the specified procedures and evidence are followed.
Related Standards
- EN 1364-1: Fire resistance tests for non-loadbearing walls, underpinning the test methodology referenced in this document.
- EN 13501-2: Classification standard for the fire resistance of building products and elements, linked to outcomes from EN 1364-1 testing and extended application procedures.
- EN 14509: Specifies requirements for self-supporting double skin metal-faced insulating panels; forms the materials basis for qualifying panel types.
- EN 15725: Provides principles for the generation and assessment of extended application reports.
- EN 1363-1 & EN 1363-2: General fire resistance test requirements and additional procedures.
- EN ISO 13943: Common vocabulary for fire safety, ensuring uniform terminology across documents.
- EN 1993-1-2 (Eurocode 3): Structural fire design for steel structures, relevant to performance assessment at elevated temperatures.
By following SIST EN 15254-5:2026, stakeholders throughout the construction and fire safety industry can ensure high fire resistance standards for metal sandwich panel wall systems, streamline compliance with European codes, and support safer building environments through reliable and cost-effective product extension strategies.
Relations
- Effective Date
- 01-Sep-2026
- Effective Date
- 16-Sep-2026
- Effective Date
- 12-Aug-2026
- Effective Date
- 29-Jul-2026
- Effective Date
- 29-Jul-2026
- Effective Date
- 29-Jul-2026
- Effective Date
- 29-Jul-2026
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Frequently Asked Questions
SIST EN 15254-5:2026 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Extended application of results from fire resistance tests - Non-loadbearing walls - Part 5: Metal sandwich panel construction". This standard covers: This document defines rules for extended applications, provides guidance, and, where appropriate, defines procedures, for variations of certain parameters and factors associated with the design of internal and external non-loadbearing walls constructed of metal sandwich panels and that have been tested in accordance with EN 1364 1, which could generate a classification in accordance with EN 13501 2. This document applies for double skin metal faced sandwich panels having an insulating core bonded to both facings as defined in EN 14509 not stabilizing a whole building or parts of it.
This document defines rules for extended applications, provides guidance, and, where appropriate, defines procedures, for variations of certain parameters and factors associated with the design of internal and external non-loadbearing walls constructed of metal sandwich panels and that have been tested in accordance with EN 1364 1, which could generate a classification in accordance with EN 13501 2. This document applies for double skin metal faced sandwich panels having an insulating core bonded to both facings as defined in EN 14509 not stabilizing a whole building or parts of it.
SIST EN 15254-5:2026 is classified under the following ICS (International Classification for Standards) categories: 13.220.50 - Fire-resistance of building materials and elements; 91.060.10 - Walls. Partitions. Facades. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 15254-5:2026 has the following relationships with other standards: It is inter standard links to SIST EN 15254-5:2018, SIST EN 13820:2004, kSIST FprEN 1993-1-2:2023, SIST EN 14509:2014, SIST EN 13501-2:2016, SIST EN 13501-2:2008+A1:2009, SIST EN 13501-2:2023. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN 15254-5:2026 is associated with the following European legislation: EU Directives/Regulations: 305/2011; Standardization Mandates: M/117. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
SIST EN 15254-5:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2026
Nadomešča:
SIST EN 15254-5:2018
Razširjena uporaba rezultatov preskusov požarne odpornosti - Nenosilne stene -
5. del: Konstrukcije iz kovinskih sendvič panelov
Extended application of results from fire resistance tests - Non-loadbearing walls - Part
5: Metal sandwich panel construction
Erweiterter Anwendungsbereich der Ergebnisse von Feuerwiderstandsprüfungen -
Nichttragende Wände - Teil 5: Sandwichelemente in Metallbauweise
Application étendue des résultats d'essais de résistance au feu - Murs non porteurs -
Partie 5 : Panneaux sandwiches métalliques pour la construction
Ta slovenski standard je istoveten z: EN 15254-5:2026
ICS:
13.220.50 Požarna odpornost Fire-resistance of building
gradbenih materialov in materials and elements
elementov
91.060.10 Stene. Predelne stene. Walls. Partitions. Facades
Fasade
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 15254-5
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2026
EUROPÄISCHE NORM
ICS 13.220.50; 91.060.10 Supersedes EN 15254-5:2018
English Version
Extended application of results from fire resistance tests -
Non-loadbearing walls - Part 5: Metal sandwich panel
construction
Application étendue des résultats d'essais de Erweiterter Anwendungsbereich der Ergebnisse von
résistance au feu - Murs non porteurs - Partie 5 : Feuerwiderstandsprüfungen - Nichttragende Wände -
Panneaux sandwiches métalliques pour la construction Teil 5: Sandwichelemente in Metallbauweise
This European Standard was approved by CEN on 15 June 2026.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15254-5:2026 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms, definitions, symbols and abbreviations . 4
3.1 Terms and definitions . 4
3.2 Symbols and abbreviations . 6
4 Establishing the field of extended application . 7
4.1 General . 7
4.2 Assumptions in the extended application . 7
5 Rules for extended applications of the tested product/construction . 8
5.1 General . 8
5.2 Variations in the materials of the product . 10
5.2.1 General . 10
5.2.2 Variations in the metal sheets . 10
5.2.3 Variations in the adhesive . 11
5.2.4 Variations in the core material . 12
5.3 Variations in the construction . 13
5.3.1 Variations in span length . 13
5.3.2 Variations in orientation . 16
5.3.3 Variations in the panel thickness . 16
5.3.4 Variations in the longitudinal joint construction . 17
5.3.5 Variations in the boundary conditions and fixing system . 17
5.3.6 Length and height of wall construction . 17
5.4 Interaction between the factor influences . 17
5.5 Support structure . 17
5.6 Heating conditions . 18
6 Calculation methods and additional measurements. 18
6.1 Calculation methods . 18
6.1.1 General . 18
6.1.2 Calculation of strength properties . 18
6.2 Additional measurements to be carried out in the reference test . 18
7 Report of the extended application analysis . 19
Annex A (informative) Typical behaviour of a metal faced sandwich panel wall when
exposed to fire . 20
Annex B (normative) Evaluation of extension of span length . 21
Bibliography . 26
European foreword
This document (EN 15254-5:2026) has been prepared by Technical Committee CEN/TC 127 “Fire
safety in buildings”, the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by January 2027, and conflicting national
standards shall be withdrawn at the latest by January 2027.
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights. CEN shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN 15254-5:2018.
The EN 15254 series, under the general title, Extended application of results from fire resistance
tests — Non-loadbearing walls, consists of the following parts:
— Part 2: Masonry and gypsum blocks;
— Part 3: Lightweight partitions;
— Part 4: Glazed constructions;
— Part 5: Metal sandwich panel construction;
— Part 6: Curtain walling;
— Part 7: Metal sandwich panel construction.
This document has been prepared under a standardization request addressed to CEN by the
European Commission. The Standing Committee of the EFTA States subsequently approves these
requests for its Member States.
Any feedback and questions on this document should be directed to the users’ national standards
body. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Türkiye and the United Kingdom.
1 Scope
This document defines rules for extended applications, provides guidance, and, where
appropriate, defines procedures, for variations of certain parameters and factors associated with
the design of internal and external non-loadbearing walls constructed of metal sandwich panels
and that have been tested in accordance with EN 1364-1, which could generate a classification in
accordance with EN 13501-2.
This document applies for double skin metal faced sandwich panels having an insulating core
bonded to both facings as defined in EN 14509 not stabilizing a whole building or parts of it.
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.
EN 1363-1, Fire resistance tests — Part 1: General requirements
EN 1363-2, Fire resistance tests — Part 2: Alternative and additional procedures
EN 1364-1, Fire resistance tests for non-loadbearing elements — Part 1: Walls
EN 1993-1-2, Eurocode 3 — Design of steel structures — Part 1-2: Structural fire design
EN 13501-2, Fire classification of construction products and building elements — Part 2:
Classification using data from fire resistance and/or smoke control tests, excluding ventilation
services
EN 13820, Thermal insulating materials for building applications — Determination of organic
content
EN 13501-1, Fire classification of construction products and building elements — Part 1:
Classification using data from reaction to fire tests
EN 14509:2013, Self-supporting double skin metal faced insulating panels — Factory made
products - Specifications
EN 15725:2023, Extended application on the fire performance of construction products and
building elements: Principle of EXAP standards and EXAP reports
EN ISO 13943, Fire safety — Vocabulary (ISO 13943)
3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 14509, EN 15725,
EN 1364-1, EN 1363-1 and EN ISO 13943 the following apply.
ISO and IEC maintain terminological 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/
3.1.1
direct field of application
outcome of a process (involving the application of defined rules) whereby a test result is deemed
to be equally valid for variations in one or more of the product properties and/or intended end-
use applications
3.1.2
extended field of application
outcome of a process (involving the application of defined rules that can incorporate calculation
procedures) that predicts, for a variation of a product property and/or its intended end-use
application(s), a test result on the basis of one or more test results to the same test standard
3.1.3
factor
variation that can be applied to a parameter
EXAMPLE A change in the core thickness.
3.1.4
factor influence
potential cause of a change in the fire resistance when the factor is changed
EXAMPLE Increase in fire resistance as result of an increase of the thickness of the core.
3.1.5
fastening
fixing
component that fastens the panels to a support structure or to the test frame
3.1.6
fixing system
system consisting of fastenings and possible other means to fasten the panels to a support
structure or to the test frame
3.1.7
height
height of the wall in the reference test or in the end-use application for horizontally
or vertically installed wall panels
3.1.8
length
length of the wall in the reference test or in the end-use application for horizontally
or vertically installed wall panels
3.1.9
reference test
fire resistance test in accordance with EN 1363-1 and EN 1364-1, and where applicable
EN 1363-2, on which the extended application is based and the results of which are used as the
main source of data for the extended application
3.1.10
stitching
component for fixing panels to panels in the longitudinal joint
3.1.11
span length
centre to centre distance between the supports of a panel and/or intermediate supports to which
the sandwich panel is fixed
3.1.12
support structure
construction onto which the panel wall is fastened in the end-use application
3.1.13
test frame
frame containing the test construction for the purpose of mounting onto the furnace
3.1.14
fire resistance classification period
time of fire separation function depending on E, (integrity), I, (insulation), W (radiation), as
described in EN 13501-2
EXAMPLE Test result 48 min., fire classification time 45 min.
3.2 Symbols and abbreviations
For the purposes of this document, the following symbols and abbreviations apply.
E integrity (etanchéité)
F load
F , tensile load on the fasteners
t Ed
F shear load on the fasteners
v,Ed
F design tensile load on the fastener at normal temperature
t,Rd
F design shear load on the fastener at normal temperature
v,Rd
I isolation
L span length
L distance between midspan of two adjacent panels
L overlap of the metal facing at the panel-to-panel joint
PCS gross calorific potential
R resistance, loadbearing capacity
b width of panel
c opening in adjacent metal sheet joints at normal room temperature on unexposed side
c opening in adjacent metal sheet joints during the reference test on unexposed side
d depth of core
c
f deflection of panel to panel joint in the reference test (deflection into the furnace to be
j
taken as positive)
f , f deflection of two adjacent panels at midspan in the reference test (deflection into the
1 2
furnace to be taken as positive)
g panel weight per square meter
k yield strength factor
n number of fasteners
q pressure action on the panel in a fire situation
Δc relative increase in opening of the metal sheet joint in the reference test
Δf relative deflection of the joint compared to the adjacent panels in the reference test (to
be calculated taking into account the positive and negative directions of the deflections)
4 Establishing the field of extended application
4.1 General
An extended application analysis is required when the application differs in one or more
parameters from the tested one described in the test report and/or in the classification document,
and which is not covered by the direct field of application of the classification document.
Extended application is a prediction of the expected fire resistance of fire-resistant metal faced
sandwich panels. It can be based on interpolation between or extrapolation from test data. The
fundamental consideration shall be that the fire-resistant metal faced sandwich panels after
extension would achieve the required fire performance if it were to be tested according to
EN 1364-1.
The extended application of test results from metal faced sandwich panels used as a non-
loadbearing wall shall be based on the reference fire test results performed according to
EN 1364-1 and can be complemented by one or more additional tests. The general rules in
EN 15725 shall be followed.
The necessary information for extrapolation of test results shall be assessed during the sampling
and testing in accordance with EN 14509.
4.2 Assumptions in the extended application
The following assumptions are considered when evaluating extended applications for sandwich
panels:
a) The wall is required to provide fire resistance in the end-use condition; relevant classes are
given in EN 13501-2.
b) The wall is assumed to be exposed on the entire face of one side to the standardized heating
conditions given in the fire resistance test specification in EN 1363-1 or to alternative and
additional procedures given in EN 1363-2 (see also Annex A).
c) The structure above and below the wall does not deflect vertically during the fire exposure
period; this simulates the non-deflecting nature of the test frame which forms part of the
furnace test apparatus.
In reality constructions deflect and this should be taken into account by the building designer
when designing the building and planning the constructional details so that no vertical loads
are applied to the wall.
d) After delamination of the fire-exposed facing the dead load of the sandwich panels is carried
by a support structure to which the ends of the sandwich panels are attached.
e) The support structure has at least the same loadbearing capacity, R, of the resistance to fire
performance as the required fire resistance classification period of the sandwich panel wall
in end-use condition.
f) The self-weight of the facing and core is calculated from the volume and density of the
materials.
g) The calculation of the reduction in the strength properties of steel at elevated temperature
shall be in accordance with EN 1993-1-2.
5 Rules for extended applications of the tested product/construction
5.1 General
When performing extended applications for a tested wall changes can occur either in the
materials and/or in the construction. Both are dealt with in this document. Table 1 and Table 2
list the changes which can or cannot be made in an extended application assessment. The rules
for the changes are given in 5.2 and 5.3.
Table 1 — Material changes relevant to extended application
Parameter Factors Factor influence on Rules
performance
Integrity E Insulation I
a
Changes in Chemical influence no influence 5.2.2.1
metal facings composition of
coating
Change of colour influence influence 5.2.2.1
Change between influence influence 5.2.2.1
coated and non-
coated metal
a
Sheet thickness influence no influence Allowed up
to ± 0,2 mm of
tested thickness.
Change from one no information no 5.2.2.2
metal to another information
Change in sheet no information no 5.2.2.3
geometry information
Changes in Amount influence influence 5.2.3
adhesive
a
Type influence no influence 5.2.3
Changes in Type major influence major 5.2.4
core material influence
Change in major influence major 5.2.4.2 to 5.2.4.6
composition influence
a
It is understood that when a change in a factor can influence the integrity of a joint, there is a
possibility that a change in the leakage of hot gases or in joint geometry can also influence the
temperature rise near the joint and therefore influence the insulation rating.
Table 2 — Constructional changes relevant to extended application
Parameter Factors Factor influence on Rules
performance
Integrity E Insulation I
a
Span length Decrease no influence no influence Allowed
a
Increase influence no influence 5.3.1
a
Orientation influence no influence 5.3.2
a
Panel width Decrease no influence no influence Test results valid
a
Increase influence no influence Test results valid
up to + 20 %
Panel thickness Decrease major influence major 5.3.3
influence
e.g. core
thickness
Increase major influence major 5.3.3
influence
Joint Type major influence major 5.3.4
construction influence
Stitching influence influence Not allowed
decreased
Stitching increased influence influence 5.3.4
Sealants influence influence 5.3.4
a
Fixing system Type major influence no influence 5.3.5
a
Amount decreased major influence no influence 5.3.5
a
Amount increased influence no influence Allowed
Protection major influence influence 5.3.5
decreased
Protection influence influence Allowed
increased
a
Length of Vertical no influence no influence 5.3.6
assembly installation
Horizontal See span length
installation 5.3.1
Height of Vertical See span length
assembly installation 5.3.1
a
Horizontal influence no influence 5.3.6
installation
a
Support Changes no information no influence 5.5
structure
a
It is understood that when a change in a factor can influence the integrity of a joint, there is a
possibility that a change in the leakage of hot gases or in joint geometry can also influence the
temperature rise near the joint and therefore influence the insulation rating.
5.2 Variations in the materials of the product
5.2.1 General
Metal faced sandwich panels consist of three main materials (facing metal sheets, adhesive and
core material). In the case of auto adhesively bonded panels the foamed core material also forms
the adhesive layer during the foaming process.
Changes in the properties of the metal sheets will not affect the fire resistance results significantly
and changes can therefore be allowed. On the other hand, even small changes in the core material
can result in big variations in the fire resistance test results. These facts are considered in the
following rules.
5.2.2 Variations in the metal sheets
5.2.2.1 Variations in the coatings
Organic surface coating on fire exposed side has no influence on fire resistance.
Organic surface coating on unexposed side has influence to fire resistance:
— Test results for very light colours are also valid for sandwich panels with light colours and
dark colours (colour definition acc. to EN 14509:2013, Annex E).
— Test results for light metallic colours are also valid for sandwich panels with very light
colours, light colours and dark colours (colour definition acc. to EN 14509:2013, Annex E).
— Test results for light colours are also valid for sandwich panels with dark colours (colour
definition acc. to EN 14509:2013, Annex E).
— Test results achieved with panels with organic coated metal sheet are not valid for panels
without organic coating.
— Test results achieved with panels without organic coating are valid for panels with organic
coating.
If modifications in the coatings on the unexposed side are made compared to the tested one, the
reaction to fire classification and / or the PCS value of the coating shall be the same or better than
the tested one.
5.2.2.2 Variations in the metal material
The following rules are valid for extended applications:
a) When steel is tested, the test results are valid for all grades of steel.
NOTE For more information regarding metal faces, see EN 14509.
b) When stainless steel is tested, the test results are valid for all grades of stainless steel.
c) For other types of metals, the test result is valid for tested type only.
5.2.2.3 Changes in profile geometry of facing
The following rules are valid for extended applications:
a) Panels with different metal thicknesses on both sides are regarded as symmetrical if
difference in thickness is max. 0,2 mm.
b) For panels with flat or small profiling (between 0 mm and 5 mm) on one or both sides test
results are valid for any change in the range 0 mm to 5 mm profiling and panels are regarded
as symmetrical. This is allowable only if the declared cross panel tensile strength value is
equal or higher than for the tested panel.
c) For profiles greater than 5 mm test results are valid for variations ± 50 % of the depth of the
profile as long as d is not reduced. See Figure 1.
c
Figure 1 — Depth of the core and definition of d dependent on face geometry
c
(according to EN 14509)
5.2.3 Variations in the adhesive
This paragraph is valid only for panels with adhesively bonded cores. The following rules apply
for an adhesive with no strength at high temperatures (>500 °C) which means that the metal
sheet on the exposed side will disconnect from the core in the very beginning of a fire and the
construction will lose its sandwich capability. For this reason, an organic adhesive cannot be
changed to a non-organic one or vice versa.
Normally the energy content of the adhesive is small and will not affect the fire resistance
properties of the sandwich panel. The following rules are valid for extended applications:
a) For panels tested with PCS values of the adhesive ≤ 4 MJ/m , the results are valid for all
adhesives when PCS value stays below 4 MJ/m .
b) For panels tested with PCS value of the adhesive > 4 MJ/m , the results are valid for all PCS
values of the adhesive up to 1,15 × PCS of the tested one.
5.2.4 Variations in the core material
5.2.4.1 Gener
...