prEN 14509-3

SLOVENSKI STANDARD
01-november-2021
Tovarniško izdelane izolacijske sendvič plošče z obojestranskim kovinskim
oplaščenjem - 3. del: Preskusne metode za ugotavljanje mehanske trdnosti,
fizičnega obnašanja stavb in vzdržljivosti
Factory-made double skin metal faced insulating sandwich panels - Part 3: Test methods
for determining mechanical strength, building physical behaviour and durability
Werkmäßig hergestellte Sandwich-Elemente mit beidseitigen Metalldeckschichten - Teil
3: Prüfverfahren zur Bestimmung der mechanischen Festigkeit, des bauphysikalischen
Verhaltens und der Dauerhaftigkeit
Panneaux sandwiches isolants à deux parements métalliques manufacturés - Partie 3:
Méthodes d'essai pour déterminer la résistance mécanique, le comportement lié à la
physique des bâtiments et leur durabilité
Ta slovenski standard je istoveten z: prEN 14509-3
ICS:
91.100.60 Materiali za toplotno in Thermal and sound insulating
zvočno izolacijo materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2021
ICS 91.100.60
English Version
Factory-made double skin metal faced insulating sandwich
panels - Part 3: Test methods for determining mechanical
strength, building physical behaviour and durability
Panneaux sandwiches isolants à deux parements Werkmäßig hergestellte Sandwich-Elemente mit
métalliques manufacturés - Partie 3: Méthodes d'essai beidseitigen Metalldeckschichten - Teil 3:
pour déterminer la résistance mécanique, le Prüfverfahren zur Bestimmung der mechanischen
comportement lié à la physique des bâtiments et leur Festigkeit, des bauphysikalischen Verhaltens und der
durabilité Dauerhaftigkeit
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 128.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Turkey and
United Kingdom.
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 supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14509-3:2021 E
worldwide for CEN national Members.

Contents Page
European foreword .4
Introduction.5
1 Scope .6
2 Normative references .6
3 Terms, definitions, symbols, subscripts and abbreviations .8
3.1 Terms and definitions.8
3.2 Symbols, subscripts and abbreviations . 10
4 Test methods for determination of mechanical resistance . 14
4.1 Cross panel tensile test . 14
4.2 Compressive strength test. 17
4.3 Shear strength and shear modulus - shear beam – short term loading . 18
4.4 Shear strength and shear modulus - complete panel – short term loading . 23
4.5 Test procedures, calculations and results of shear tests– long term loading . 27
4.6 Test to determine wrinkling strength of a simply supported panel (σ ) . 28
w
4.7 Test method for determination of the creep coefficient (φ ) . 38
t
4.8 Test method for determination of wrinkling strength over central support (σ ) . 41
ws
4.9 Wrinkling strength over a central support in elevated temperature (σ ) . 45
wsT
4.10 Test for resistance to point loads and access loads . 45
4.11 Test method for determination of support reaction capacity at the end of a panel . 47
4.12 Recording and interpretation of test results . 50
4.13 Shortened test program . 54
5 Test method for determination of apparent core density and mass of panel . 55
5.1 Determination of core density . 55
5.2 Determination of mass of a panel . 56
6 Determination of the thermal transmittance of a panel (U) . 56
6.1 General . 56
6.2 Determination of the thermal conductivity of component materials . 57
6.3 Calculation of the thermal transmittance of a panel (U ) . 57
d,S
) on the basis of
6.4 Method for the calculation of the thermal transmittance of a panel (Ud,S
tabled values . 60
7 Test method for determination of water permeability of a joint – resistance to driving
rain under pulsating pressure. . 62
7.1 Principle . 62
7.2 Apparatus . 62
7.3 Test specimens . 62
7.4 Procedure . 62
7.5 Calculations and results . 63
8 Test method for determination of air permeability of a joint . 63
8.1 Principle . 63
8.2 Apparatus . 63
8.3 Test specimens . 63
8.4 Procedure . 63
8.5 Calculations and results . 63
9 Test method for determination of water vapour permeability of a joint . 63
9.1 Principle . 63
9.2 Apparatus . 63
9.3 Test specimens . 64
9.4 Procedure . 64
9.5 Calculations and results . 64
10 Test method for determination of airborne sound insulation . 64
10.1 Principle . 64
10.2 Apparatus . 64
10.3 Test specimens . 64
10.4 Procedure . 64
10.5 Calculations and results . 64
11 Test method for determination of sound absorption . 64
11.1 Principle . 64
11.2 Apparatus . 64
11.3 Test specimens . 65
11.4 Procedure . 65
11.5 Calculations and results . 65
12 Determination of durability related characteristics . 65
12.1 General . 65
12.2 Test DUR1 . 65
12.3 Test DUR2 . 67
12.4 Test report on durability tests DUR1 and DUR2 . 70
12.5 Adhesive bond between faces and prefabricated core material (wedge test) . 71
12.6 Repeated loading test . 73
12.7 Thermal shock test . 73
12.8 Corrosion protection . 75
13 Determination of fire related characteristics . 77
13.1 Reaction to fire . 77
13.2 Resistance to fire . 84
13.3 Additional instructions for external fire performance for roofs . 91
13.4 Determination of the amount and thickness of the adhesive layer . 93
13.5 Test- and classification reports concerning Reaction to fire and Resistance to fire
properties . 94
14 Determination of dimensional tolerances . 97
14.1 General . 97
14.2 Dimensional tolerances . 98
15 Sampling . 107
16 Testing rules for verification of constancy of performance (FPC). 108
16.1 General . 108
16.2 Raw material and components . 109
16.3 Non-complying products . 110
16.4 Procedure for modifications . 110
Bibliography . 112

European foreword
This document (prEN 14509-3:2021) has been prepared by Technical Committee CEN/TC 128 “Roof
covering products for discontinuous laying and products for wall cladding”, the secretariat of which is
held by NBN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 14509-3:2013.
Introduction
This document replaces Annexes A, B, C and D in EN 14509:2013. The principles for values of
characteristics to be determined are given in prEN 14509-1 for self-supporting applications and in
FprEN 14509-2 for structural applications. The testing procedures for determination of assessment of
performance are given in Clauses 4 to 14. The testing procedures for the verification of constancy of
performance (FPC) are given in Clause 16.

1 Scope
This document specifies test methods needed for determination of mechanical strength, building
physical behaviour and durability of factory-made double skin metal faced insulating sandwich panels
(hereafter sandwich panels) for use in elements for both self-supporting and structural applications in
roofs, in external and internal walls (including partitions) and in ceilings in buildings as well as those in
cold store applications.
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 508-1:2014, Roofing and cladding products from metal sheet - Specification for self-supporting of steel,
aluminium or stainless steel sheet - Part 1: Steel
EN 826:2013, Thermal insulating products for building applications - Determination of compression
behaviour
EN 1363-1:2020, Fire resistance tests - Part 1: General Requirements
EN 1364-1:2015, Fire resistance tests for non-loadbearing elements - Part 1: Walls
EN 1365-2:2014, Fire resistance tests for loadbearing elements - Part 2: Floors and roofs
EN 1602:2013, Thermal insulating products for building applications - Determination of the apparent
density
EN 1607:2013, Thermal insulating products for building applications - Determination of tensile strength
perpendicular to faces
EN 1990:2002 , Eurocode - Basis of structural design
, Eurocode 3 - Design of steel structures - Part 1-4: General rules - Supplementary rules
EN 1993-1-4:2006
for stainless steels
EN 10169:2010+A1:2012, Continuously organic coated (coil coated) steel flat products - Technical
delivery conditions
EN 10204, Metallic products - Types of inspection documents
EN 10346:2015, Continuously hot-dip coated steel flat products for cold forming - Technical delivery
conditions
EN 12085:2013, Thermal insulating products for building applications - Determination of linear
dimensions of test specimens
As impacted by EN 1990:2002/A1:2005.
As impacted by EN 1993-1-4:2006/A1:2015 and EN 1993-1-4:2006/A2:2020.
EN 12114:2000, Thermal performance of buildings - Air permeability of building components and building
elements - Laboratory test method
EN 12865:2001, Hygrothermal performance of building components and building elements -
Determination of the resistance of external wall systems to driving rain under pulsating air pressure
EN 13162:2012+A1:2015, Thermal insulation products for buildings - Factory made mineral wool (MW)
products - Specification
EN 13163:2012+A2:2016, Thermal insulation products for buildings - Factory made expanded
polystyrene (EPS) products - Specification
EN 13164:2012+A1:2015, Thermal insulation products for buildings - Factory made extruded polystyrene
foam (XPS) products - Specification
EN 13165:2013+A2:2016, Thermal insulation products for buildings - Factory made rigid polyurethane
foam (PU) products - Specification
EN 13166:2012+A2:2016, Thermal insulation products for buildings - Factory made phenolic foam (PF)
products – Specification
EN 13501-1:2018, Fire classification of construction products and building elements – Part 1:
Classification using data from reaction to fire tests
EN 13823:2020, Reaction to fire tests for building products - Building products excluding floorings exposed
to the thermal attack by a single burning item
prEN 14509-1:2021, Factory made double skin metal faced insulating sandwich panels – Part1: Self-
supporting applications
prEN 14509-2:2021, Factory made double skin metal faced insulating sandwich panels - Part2: Structural
applications
prEN 14509-5:2021, Factory made double skin metal faced insulating sandwich panels - Part 5: Design
methods. Determination criteria for combing actions and spans
EN 15254-5, Extended application of results from fire resistance tests - Non-loadbearing walls - Part 5:
Metal sandwich panel construction
EN ISO 354:2003, Acoustics - Measurement of sound absorption in a reverberation room (ISO 354:2003)
EN ISO 717-1:2020, Acoustics - Rating of sound insulation in buildings and of building elements - Part 1:
Airborne sound insulation (ISO 717-1:2020)
EN ISO 6892-1, Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO 6892-
1)
EN ISO 6946:2017, Building components and building elements - Thermal resistance and thermal
transmittance- Calculation methods (ISO 6946:2017)
EN ISO 10140-1:2021, Acoustics - Laboratory measurement of sound insulation of building elements - Part
1: Application rules for specific products (ISO 10140-1:2021)
EN ISO 10140-2:2021, Acoustics - Laboratory measurement of sound insulation of building elements - Part
2: Measurement of airborne sound insulation (ISO 10140-2:2021)
EN ISO 10211:2017, Thermal bridges in building construction - Heat flows and surface temperatures -
Detailed calculations (ISO 10211:2017)

EN ISO 10456:2007, Building materials and products - Hygrothermal properties -Tabulated design values
and procedures for determining declared and design thermal values (ISO 10456:2007)
EN ISO 11654:1997, Acoustics - Sound absorbers for use in buildings - Rating of sound absorption (ISO
11654:1997)
EN ISO 11925-2:2020, Reaction to fire tests - Ignitability of products subjected to direct impingement of
flame - Part 2: Single-flame source test (ISO 11925-2:2020)
EN ISO 12572:2016, Hygrothermal performance of building materials and products - Determination of
water vapour transmission properties - Cup method (ISO 12572:2016)
ISO 12491, Statistical methods for quality control of building materials and components
CEN/TS 1187, Test methods for external fire exposure to roofs
3 Terms, definitions, symbols, subscripts and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
assembly
connected panels with joints as their intrinsic parts as delivered to the plant
3.1.2
auto-adhesion
self-adhesion of the core to the face(s) occurring automatically without the use of an adhesive
3.1.3
bending moment capacity
maximum bending moment recorded during a test on an individual panel
3.1.4
bending resistance
characteristic value of bending moment capacity determined on the basis of a test series
3.1.5
bond, bonding
adhesion between the face(s) and the core normally provided by an adhesive
3.1.6
ceiling
covering over an internal area
3.1.7
core
layer of material, having thermal insulating properties, which is bonded between two metal faces
Note 1 to entry Panels with special edge details in the longitudinal joints may utilize different core materials from
the main insulating core (e.g. for improved fire performance) if these edge details have no influence on the
mechanical performance of the panel.
3.1.8
durability
ability of the panel to withstand the environmental effects and accommodate the consequent decrease
in mechanical strength with time caused by factors such as temperature, humidity, freeze-thaw cycles
and their various combinations
3.1.9
edge, longitudinal edge
side of the panel where adjacent panels join together in the same plane
3.1.10
face
flat, lightly profiled or profiled thin metal sheet firmly bonded to the core.
3.1.11
flat face
face without any rolled or pressed profile, or raised strengthening rib
3.1.12
incompletely bonded face
metal face whose bond to the core is adequate for sandwich action but does not include the entire
surface of the core
Note 1 to entry An example is a trapezoidally profiled face that has voids between the raised profiles and the core.
3.1.13
incompletely bonded panel
panel in which one or both faces is incompletely bonded
3.14
joint
interface between two panels where the meeting edges have been designed to allow the panels to join
together in the same plane
Note 1 to entry The joint may incorporate interlocking parts that enhance the mechanical properties of the
system as well as improving the thermal, acoustic and fire performance and restricting air movement.
Note 2 to entry The term 'joint' does not refer to a junction between cut panels or a junction where the panels are
not installed in the same plane.
3.1.15
lamella
core material consisting of mineral wool that has been cut and orientated with the fibres perpendicular
to the faces prior to bonding
3.1.16
lightly profiled face
face with a rolled or pressed profile not exceeding 5 mm in depth
3.1.17
pre-manufactured, pre-formed
component or material that is supplied for panel production ready for direct incorporation into the
sandwich panel
3.1.18
sandwich panel
building product consisting of two metal faces positioned on either side of a core that is a thermally
insulating material, which is firmly bonded to both faces so that the three components act compositely
when under load
3.1.19
shift
period of production during a working day, normally 6 h to 8 h but can be less
3.1.20
side lap
folded area of one or both of the face materials along the longitudinal edge of the panel which engages
with the adjacent panel to form an interlocking or overlapping joint
3.1.21
wrinkling strength
strength representing the characteristic value of wrinkling stress
3.1.22
wrinkling stress
stress in the compressed face of a panel undergoing loading in bending at the moment of failure load
3.2 Symbols, subscripts and abbreviations
For the purposes of this document, the following symbols, subscripts and abbreviations apply.
3.2.1 Symbols
A cross-sectional area (may be full width of panel or per unit width)
B flexural rigidity (may be full width of panel or per unit width),
overall width of the panel/specimen,
C ratio
D overall thickness of the panel
E modulus of elasticity
F force,
load,
support reaction
G shear modulus,
permanent action
I moment of inertia
L span,
distance,
width of support (L )
s
M bending moment
N axial compressive force
Q variable action
R resistance,
sound reduction index (R ),
w
reflectivity (R ),
G
tensile strength (R , R )
DUR 24
S shear rigidity,
value of a load effect,
effect of an action
T temperature
U thermal transmittance,
thermal transmittance including the influence of the joints U
d,s
V shear force
a distance apart of clips (6.4)
b width of test specimen,
width of plate,
width of ribs/valleys,
bowing
d depth of face profile or stiffeners,
depth of core (d )
c
e distance between centroids of faces,
base of natural logarithms (e = 2,718 282)
f strength,
yield stress,
thermal transmittance contribution factor (f )
joint
h height of profile,
thickness (e.g. glue)
k parameter (4.11.5.2 support reaction capacity),
correction factor
l length,
deviation
m mass
n number of tests,
number of screws,
number of webs
p pitch of profile
q live load
r radius
s length of web (s )
w1
t thickness of face sheet
v variance factor
w deflection,
displacement,
compression,
cover width
x, y, z coordinates
α parameter (4.6.5.4),
coefficient of thermal expansion, sound absorption (α ),
w
ratio (4.4.5.3)
β parameter (4.6.5.4)
δ deviation
ϕ angle
γ shear strain, partial safety factor
λ thermal conductivity, λ (design value), ratio (4.4.5.3)
design
φ creep coefficient
σ wrinkling strength, standard deviation
τ shear stress
ρ coefficient,
density
3.2.2 Subscripts
C core
D expressed value (R , λ )
D D
F face,
action (γ )
F
G self-weight, degree
M material (γ )
M
Q variable action
S sandwich part of the cross-section
adj adjusted
b bending, elastic extension
c compression,
carrier (13.4.2.3),
clip (f )
joint,c
d design
e external,
additional thickness of main profiles (Δe)
eff effective
f load, face (λ )
fi
i internal (λ )
fi
i, j index
k characteristic value
lin linear
m material
nom nominal
nc without clip (f )
joint,nc
obs observed (e.g. result)
q uniform load
s support (L = support width),
s
stiffeners,
surface (R )
s1
t tension,
time,
thickness relevant for measuring the tolerances
tol tolerance (normal or special)
tr traffic (C )
tr
u ultimate (F )
u
v shear, variance
w wind,
web,
wrinkling (σ ),
w
weighted (R )
w
y yield
0 basic value,
unit width,
time (e.g. t = 0)
1 outer face,
top face
2 inner face,
bottom face
3.2.3 Abbreviations
CWT classified without testing
EPS expanded polystyrene
FPC factory production control
MW mineral wool
PCS gross calorific potential
PU rigid polyurethane foam (PU includes polyisocyanurate foam (PIR))
PF phenolic foam
XPS extruded polystyrene foam
4 Test methods for determination of mechanical resistance
4.1 Cross panel tensile test
4.1.1 Principle
This test measures the cross panel tensile strength and the E-modulus of the core material.
The characteristic value of the cross panel tensile strength shall be determined in accordance with
EN 1607:2013, Clause 4 and the following sub clauses.
4.1.2 Apparatus
The tensile test apparatus shall be in accordance with EN 1607:2013, Clause 5.
4.1.3 Test specimens
Conditioning of the test specimens shall comply with EN 1607:2013, 6.4. The test shall be performed
with the faces of the panel intact (in place) in order to include the tensile bond strength between the
faces and the core or to demonstrate adequate bond.
For panels with profiled faces the specimens shall be cut from the predominant thickness (see examples
in Figure 1).
Figure 1 — Cutting of specimens
Test specimens shall be of square cross-section having side dimensions between 100 mm and 300 mm.
Where applicable the test specimen shall include the full width of lamellas.
For incompletely bonded panels, the specimens shall be cut from the fully bonded part of the cross-
section (see the right-hand example in Figure 1).
The dimensions of the specimen shall be measured in accordance with EN 12085:2013, Clause 7. The
tolerance on side dimension shall be ± 3 mm.
NOTE 1 Test specimens are very sensitive to the process of cutting and the accuracy of testing in particular for
tensile test measurements. Considerable care is needed in the cutting process, especially if the core material is
relatively weak or has brittle tendencies. The cutting can be carried out with a band saw with a fine-toothed blade.
It can be advantageous to sandwich the specimen between two pieces of plywood or similar material in order to
reduce vibration during the cutting process. It is suggested that specimens be carefully inspected after cutting.
Those that show evidence of delamination caused by the cutting process are rejected (up to a maximum of 30 %
of those cut for any family of tests).
Where it is not possible to cut a specimen with two plain faces, due to the profile of the faces, the
specimen shall be prepared with an appropriately shaped filling piece, which is glued to the profiled face
(see examples in Figure 2).
Additional thin layers may be adhered to the faces in order to ensure that the loading platens of the
testing machine are parallel at the commencement of the tensile test.
NOTE 2 As an alternative to the use of shaped filling pieces and if the shape of the profiled face is suitable, it can
be possible to glue two specimens together in such a way that the profiled faces mate.

Figure 2 — Examples of specimens with shaped filling pieces
4.1.4 Procedure
The test shall be carried out by loading the specimen continuously, or in at least 10 increments, using a
tensile testing machine. The deflection rate shall have a minimum value of 1 % of d per minute and shall
c
not exceed 3 % of dc per minute. The results have to be assessed with an accuracy of 1% of the mean
value.
The test shall be continued until the ultimate load (F ) is reached (Figure 3). If the specimen does not
u
exhibit a clearly defined ultimate load the test shall be discontinued when the relative deformation
exceeds 20 %.
The tests shall be performed under normal laboratory conditions of temperature and humidity except
when carrying out the test at elevated temperature (4.1.6).
4.1.5 Calculations and results
4.1.5.1 General
Recording and interpretation of test results shall comply with 4.12.
The test report shall give the characteristic value (4.12.2) for tensile strength and shall state the failure
mode, i.e. whether failure was in the adhesion layer or in the core.
4.1.5.2 Cross panel tensile strength (f )
Ct
A load-deflection curve shall be drawn (see Figure 3) and the tensile strength shall be calculated as
follows.
The tensile strength f is given by Formula (1):
Ct
F
u
f =
Ct
A
(1)
where
F is the ultimate load;
u
A is the cross-sectional area of the specimen determined from the measured dimensions.
NOTE For specimens that do not exhibit a well-defined ultimate load, Fu may alternatively be defined as the
load at a specified relative deformation. For polyurethane foams, 10 % relative deformation (0,1 dc) may be an
appropriate limit. For materials with a more rigid cell structure or of non-cellular structure, a lower value may be
used.
Figure — Load against deflection curve (F against displacement ‘w’)
3 U
NOTE Special attention should be given in cases where the failure is close to the adhesion layer to determine
the location of the failure.
4.1.5.3 Cross panel tensile modulus (E )
Ct
The test report shall also give the characteristic and mean value of cross panel tensile modulus. The
tensile modulus E is given by Formula (2) and calculated from the linear part of the load-tension curve,
Ct
preferable between the load points 20% and 50% of the ultimate load:
Fh
uC
E =
Ct
wA
u
(2)
where
F is the ultimate load;
u
h is the thickness of the test specimen;
c
w is the ideal displacement at ultimate load based on the linear part of the curve as shown
u
in Figure 3. The linear part is the section of the curve between appr. 20 % to 40 % of the
maximum load;
A is the cross-sectional area of the specimen determined from the measured dimensions.
4.1.5.4 Cross panel tensile strength and modulus at elevated temperature
For determination of cross panel strength and modulus, the test described in 4.1.1 to 4.1.5 shall also be
carried out on specimens which have been heated for 20 h to 24 h in a heating chamber at a temperature
+3
of °C. The tensile test shall be carried out immediately, before the specimen has cooled. If the
−1
application requires different temperatures the preconditioning and testing can also be performed at
this temperature if specimens have been heated for 20 h to 24 h in a heating chamber.
The test is recommended to be carried out by heating the specimens together with the load distributing
platens to a temperature a little above 80 °C and then carrying out the tensile test before the specimen
+3
has cooled below 80 °C (limits 80 °C).
−1
The characteristic value for the cross panel tensile strength and -modulus at elevated temperature shall
be added to the test report.
4.2 Compressive strength test
4.2.1 Principle
This test measures the compressive strength and E-modulus in compression.
The characteristic value of the compressive strength shall be determined in accordance with
EN 826:2013, Clause 4 and the following sub clauses.
4.2.2 Apparatus
The apparatus shall be in accordance with EN 826:2013, Clause 5.
4.2.3 Test specimens
Conditioning of the test specimens shall comply with EN 826:2013, 6.4. Test specimens shall be
prepared as described in 4.1.3. If filling pieces are needed because of the profile of face(s) then these
shall not be glued to the loading platen.
4.2.4 Procedure
The specimen shall be placed between the two parallel stiff loading plates of a compression testing
machine. The deflection rate shall have a minimum value of 1 % of d per minute and shall not exceed 3
c
% of d per minute. The results have to be assessed with an accuracy of 1% of the mean value and a load-
c
deflection curve drawn (see Figure 3).
The tests shall be performed under normal laboratory conditions of temperature and humidity.
4.2.5 Calculations and results
4.2.5.1 General
Recording and interpretation of test results shall comply with 4.12.
The test report shall give the characteristic value (4.12.2) for compression strength.
4.2.5.2 Compressive strength (f )
Cc
The compressive strength f shall be calculated using Formula (3):
Cc
F
u
f =
Cc
A
(3)
where
F is the ultimate load;
u
A is the cross-sectional area of the specimen determined from the measured dimensions.

For specimens, which do not exhibit a well-defined ultimate load, Fu may alternatively be defined as the
load at a specified relative deformation. For polyurethane foams, 10 % relative deformation (0,1 dc) may
be an appropriate limit (see Figure 3). For materials with a more rigid cell structure or of non-cellular
structure, a lower value may be used.
4.2.5.3 Compressive E-modulus (E )
Cc
The test report shall give the characteristic and mean E-modulus. The compressive module is calculated
from the linear part of the load-compression curve, preferable between the load points 20 % and 50 %
of the ultimate load.
The compressive modulus E shall be calculated using Formula (4):
Cc
Fh
uC
E =
Cc
wA
u
(4)
where
F is the ultimate load;
u
h is the thickness of the test specimen;
c-
w is the ideal displacement at ultimate load based on the linear part of the curve as shown in
u
Figure 3. The linear part is the section of the curve between appr. 20 % to 40 % of the
maximum load;
A is the cross-sectional area of the specimen determined from the measured dimensions.
Recording and interpretation of test results shall comply with 4.12.
4.3 Shear strength and shear modulus - shear beam – short term loading
4.3.1 Principle
This test determines the shear strength and shear modulus and is considered as a reference method.
The ultimate load carried by the specimen failing in shear is measured and the shear modulus is
calculated from the load deflection curve.
4.3.2 Apparatus
The test apparatus for two-point loading is illustrated as example in Figure 4 a If shear failure is not
achieved a four-point loading test setup may be used see Figure 4 b.
Steel load spreading plates (p) are to be used below the load points and over the supports. The thickness
of the load spreading plates shall be between 8 mm and 12 mm.
The width L of the load spreading plates at the support and load points shall be a minimum of 60 mm.
s
This value shall be increased as necessary, in order to avoid local crushing of the core and to achieve the
maximum possible shear stress at failure. The clear distance between the load plate and support plate
shall not be less than 1,2 dc.
a) Test setup for 2-point load

b) Test setup for 4-point loading
Key
F applied load
r rollers, radius 15 mm
w measured deflection
p metal load spreading plates of width Ls
o overhang not exceeding 50 mm
Figure 4 — Example on test on shear beam with two or four load points
4.3.3 Test specimens
The samples shall be stored at least 6 h at (23 + 2) C.
The specimens shall be cut in the lengthwise direction of the panel. The position shall be chosen so that
the faces of the specimen are flat and parallel.
Faces may incorporate light profiling.
For all core materials except MW lamellas, the width of the specimen shall be 100 mm ± 2 mm. For MW
lamellas the width to be used shall be ≥ 100 mm and shall be chosen to incorporate at least one full
width of lamellas. There shall be no cut ends of lamellas or pre-formed core material within the length
of the test specimen.
NOTE 1 With thicker panels and panels with lamella cores, it can be preferable to use the test described in 4.4
to determine the shear strength and modulus of panels.
Span L shall be chosen so that a shear failure is obtained. If the span chosen to be used in the test, does
not result in a shear failure similar to that illustrated in Figure 5, the span shall be reduced in increments
of 100 mm until a shear failure is obtained. Subsequent tests shall then be carried out at the reduced
span.
NOTE 2 With thicker panels it can be advantageous to use spans greater than 1 000 mm.
If the test does not result in shear failure, the results may be used for assessment of performance and
FPC as the outcome will be safe.

Figure 5 — Typical shear failure
4.3.4 Procedure
The specimen shall be loaded with point loads. The test setup can be as shown in Figure 4. The loading
rate shall be uniform and such as to result in failure between 1 min and 5 min after the commencement
of the test. The results have to be assessed with an accuracy of 1% of the mean value. The loading shall
be continued until failure and a load-deflection curve shall be drawn.
In the case this test setup does not give shear failure, test procedures using four-point loads may be used
to achieve shear failure. The tests shall be performed under normal laboratory conditions of
temperature and humidity.
The metal thickness, excluding all protective coatings, of both faces of each test specimen shall be
measured and recorded.
4.3.5 Calculations and results
4.3.5.1 General
Recording and interpretation of test results shall comply with 4.12.
The test report shall give the characteristic value (4.12.2) for shear strength and shall state the failure
mode, i.e. whether failure was in the face layer or in the core.
4.3.5.2 Shear strength f )
Cv
The ultimate shear strength f of the core material shall be calculated from the maximum load attained
Cv
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