Sandwich boards for furniture (SWB-F) - Factory made products - Definition, classification and test methods for determination of performance characteristics

This European Technical Specification defines terms, establishes a classification and specifies test methods for flat, factory made, non-structural, faced and unfaced sandwich boards for use in furniture manufacturing (SWB-F) for dry (service class 1) and humid conditions (service class 2). This European Technical Specification does not specify requirements.
Guidance is provided for the selection of board properties which are relevant for specific board applications.
This European Technical Specification is not applicable to products which are already covered by existing standards.

Sandwichplatten für Möbel (SWB-F) - Werkmäßig hergestellte Produkte - Definition, Klassifizierung und Prüfverfahren zur Bestimmung der Leitstungseigenschaften

Diese Europäische Technische Spezifikation definiert Benennungen, stellt ein Klassifizierungssystem auf und legt Prüfverfahren für ebene, werksmäßig hergestellte, nicht tragende, unbeschichtete und beschichtete Sandwichplatten für die Möbelherstellung (SWB-F) zur Verwendung im Trockenbereich (Nutzungsklasse 1) und Feuchtbereich (Nutzungsklasse 2) fest. Diese Europäische Technische Spezifikation legt keine Anforderungen fest.
Zur Auswahl der für bestimmte Plattenanwendungen erforderlichen Platteneigenschaften wird eine Anleitung gegeben.
Diese Europäische Technische Spezifikation gilt nicht für Erzeugnisse, die durch bestehende Normen bereits erfasst sind.

Panneaux sandwiches pour meubles (SWB-F) - Produits manufacturés - Définition, classification et méthodes d'essai pour la détermination des propriétés fonctionelles

La présente Spécification technique européenne définit les termes, dresse une classification et précise les méthodes d'essai associés aux panneaux sandwiches plats, non structurels, revêtus ou bruts, fabriqués en usine, utilisés dans la fabrication de meubles (SWB-F), en milieu sec (classe de service 1) et humide (classe de service 2). Cette Spécification technique européenne ne précise aucune exigence.
Elle donne des conseils pour faciliter la sélection de propriétés de panneau adaptées aux emplois spécifiques des panneaux.
La présente Spécification technique européenne ne s'applique pas aux produits qui sont déjà traités dans des normes existantes.

Lesne plošče - Lastnosti in zahteve za specifikacijo sendvič plošč za pohištvo

Ta evropska tehnična specifikacija določa pojme, vzpostavlja sistem klasifikacije in navaja preskusne metode za tovarniške ploske negradbene sendvič plošče, odporne ali neodporne proti vlagi, za uporabo pri izdelavi pohištva (SWB-F) za suhe (storitveni razred 1) ali vlažne razmere (storitveni razred 2). Ta evropska tehnična specifikacija ne določa zahtev. Podaja smernice za izbrane lastnosti plošč, ki se nanašajo na določene načine uporabe plošč. Ta evropska tehnična specifikacija ne velja za izdelke, ki jih zajemajo že obstoječi standardi.

General Information

Status
Published
Publication Date
12-Nov-2013
Current Stage
9093 - Decision to confirm - Review Enquiry
Due Date
02-Dec-2019
Completion Date
14-May-2020

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SLOVENSKI STANDARD
SIST-TS CEN/TS 16526:2014
01-julij-2014
/HVQHSORãþH/DVWQRVWLLQ]DKWHYH]DVSHFLILNDFLMRVHQGYLþSORãþ]DSRKLãWYR

Wood-based panels - Determination of performance characteristics for specification of

sandwich boards for furniture
Holzwerkstoffe - Bestimmung der Leistungseigenschaften von Sandwich-Platten für
Möbel
Panneaux sandwiches pour meubles (SWB-F) - Produits manufacturés - Définition,

classification et méthodes d'essai pour la détermination des propriétés fonctionelles

Ta slovenski standard je istoveten z: CEN/TS 16526:2013
ICS:
79.060.01 /HVQHSORãþHQDVSORãQR Wood-based panels in
general
97.140 Pohištvo Furniture
SIST-TS CEN/TS 16526:2014 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TS CEN/TS 16526:2014
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SIST-TS CEN/TS 16526:2014
TECHNICAL SPECIFICATION
CEN/TS 16526
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
November 2013
ICS 79.060.01
English Version
Sandwich boards for furniture (SWB-F) - Factory made products
- Definition, classification and test methods for determination of
performance characteristics

Panneaux sandwiches pour meubles (SWB-F) - Produits Sandwichplatten für Möbel (SWB-F) - Werkmäßig

manufacturés - Définition, classification et méthodes d'essai hergestellte Produkte - Definition, Klassifizierung und

pour la détermination des propriétés fonctionelles Prüfverfahren zur Bestimmung der Leitstungseigenschaften

This Technical Specification (CEN/TS) was approved by CEN on 15 June 2013 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their

comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available

promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)

until the final decision about the possible conversion of the CEN/TS into an EN is reached.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United

Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 16526:2013 E

worldwide for CEN national Members.
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CEN/TS 16526:2013 (E)
Contents Page

Foreword ..............................................................................................................................................................4

1 Scope ......................................................................................................................................................5

2 Normative references ............................................................................................................................5

3 Terms and definitions ...........................................................................................................................6

4 Classification ..........................................................................................................................................9

4.1 General ....................................................................................................................................................9

4.2 Classification according to board lay-up ............................................................................................9

4.3 Classification according to surface appearance ................................................................................9

4.4 Classification according to conditions of use ....................................................................................9

4.5 Classification according to application purposes .............................................................................9

5 Symbols ............................................................................................................................................... 10

5.1 General ................................................................................................................................................. 10

5.2 Symbols related to conditions of use ............................................................................................... 10

5.3 Symbols related to specific applications ......................................................................................... 10

5.4 Combination of symbols for identification of sandwich boards ................................................... 10

6 Conditioning and test conditions ...................................................................................................... 10

7 Sampling, preparation and handling of test pieces and expression of test results .................... 11

7.1 General requirements ......................................................................................................................... 11

7.2 Testing of SWB-F in combination with auxiliary material(s) or after execution of additional

processing steps ................................................................................................................................ 12

7.3 Test piece size ..................................................................................................................................... 12

7.4 Determination of dimensions of test pieces .................................................................................... 12

7.5 Expression of test results .................................................................................................................. 13

8 Test methods ....................................................................................................................................... 13

8.1 General guideline on the description and use of test methods ..................................................... 13

8.2 Physical properties ............................................................................................................................. 13

8.2.1 Determination of board dimensions ................................................................................................. 13

8.2.2 Moisture content ................................................................................................................................. 13

8.2.3 Apparent density and mass per unit area ........................................................................................ 14

8.2.4 Linear expansion due to changes in relative humidity ................................................................... 14

8.2.5 Behaviour under humidity variations in successive uniform climates ......................................... 14

8.2.6 Moisture resistance ............................................................................................................................ 14

8.3 Mechanical properties ........................................................................................................................ 16

8.3.1 Flexural properties.............................................................................................................................. 16

8.3.2 Surface soundness ............................................................................................................................. 18

8.3.3 Compressive properties perpendicular to the plane of the board ................................................ 18

8.3.4 Impact resistance................................................................................................................................ 21

8.3.5 Shear strength ..................................................................................................................................... 22

8.4 Properties relevant to processing and to performance in use ...................................................... 23

8.4.1 General ................................................................................................................................................. 23

8.4.2 Integrity of board edges ..................................................................................................................... 24

8.4.3 Quality of edge banding ..................................................................................................................... 24

8.4.4 Load bearing capacity of fasteners .................................................................................................. 30

8.4.5 Shear resistance of a grooved board ............................................................................................... 33

8.5 Formaldehyde emission ..................................................................................................................... 34

9 Marking ................................................................................................................................................ 34

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10 Test report ............................................................................................................................................ 34

Annex A (normative) Test methods ................................................................................................................ 36

Annex B (informative) Characterization of sandwich boards for different applications in furniture

manufacturing ...................................................................................................................................... 48

Bibliography ...................................................................................................................................................... 51

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Foreword

This document (CEN/TS 16526:2013) has been prepared by Technical Committee CEN/TC 112 “Wood-based

panels”, the secretariat of which is held by DIN.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria, Croatia, Cyprus,

Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,

Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,

Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

SAFETY STATEMENT — Persons using this document should be familiar with the normal laboratory practice,

if applicable. This document does not purport to address all of the safety problems, if any, associated with its

use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure

compliance with any regulatory conditions.

ENVIRONMENTAL SAFETY— It is understood that some of the material permitted in this standard may have

negative environmental impact. As technological advantages lead to better alternatives for these materials,

they will be eliminated from this standard to the extent possible. At the end of the test, it is recommended that

the user of the standard takes care to carry out an appropriate disposal of the wastes, according to local

regulation.
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1 Scope

This European Technical Specification defines terms, establishes a classification and specifies test methods

for flat, factory made, non-structural, faced and unfaced sandwich boards for use in furniture manufacturing

(SWB-F) for dry (service class 1) and humid conditions (service class 2). This European Technical

Specification does not specify requirements.

Guidance is provided for the selection of board properties which are relevant for specific board applications.

This European Technical Specification is not applicable to products which are already covered by existing

standards.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) applies.

EN 311, Wood-based panels - Surface soundness - Test method

EN 318, Wood based panels - Determination of dimensional changes associated with changes in relative

humidity

EN 320, Particleboards and fibreboards - Determination of resistance to axial withdrawal of screws

EN 322, Wood-based panels - Determination of moisture content

EN 324-1, Wood-based panels - Determination of dimensions of boards - Part 1: Determination of thickness,

width and length

EN 324-2, Wood-based panels - Determination of dimensions of boards - Part 2: Determination of squareness

and edge straightness
EN 325, Wood-based panels - Determination of dimensions of test pieces

EN 326-1, Wood-based panels - Sampling, cutting and inspection - Part 1: Sampling and cutting of test pieces

and expression of test results

EN 326-2, Wood-based panels - Sampling, cutting and inspection - Part 2: Initial type testing and factory

production control

EN 326-3, Wood-based panels - Sampling, cutting and inspection - Part 3: Inspection of an isolated lot of

panels

EN 438-2, High-pressure decorative laminates (HPL) - Sheets based on thermosetting resins (usually called

Laminates) - Part 2: Determination of properties

EN 717-1, Wood-based panels - Determination of formaldehyde release - Part 1: Formaldehyde emission by

the chamber method

EN 717-2, Wood-based panels - Determination of formaldehyde release - Part 2: Formaldehyde release by

the gas analysis method

EN 789, Timber structures - Test methods - Determination of mechanical properties of wood based panels

EN 826, Thermal insulating products for building applications - Determination of compression behaviour

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EN 950, Door leaves - Determination of the resistance to hard body impact

EN 1294, Door leaves - Determination of the behaviour under humidity variations in successive uniform

climates

EN 1383, Timber structures - Test methods - Pull through resistance of timber fasteners

EN 1464, Adhesives - Determination of peel resistance of adhesive bonds - Floating roller method

EN 1995-1-1, Eurocode 5: Design of timber structures - Part 1-1: General - Common rules and rules for

buildings

EN 14323:2004, Wood-based panels - Melamine faced boards for interior uses - Test methods

EN 14727:2005, Laboratory furniture - Storage units for laboratories - Requirements and test methods

DIN 53293, Testing of sandwiches - Bending test
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
sandwich board
SWB

laminar composite product consisting of at least two skins positioned on either side of a core, which is firmly

connected to the skins (e.g. by bonding, by core-generated adhesion) so that the three (or more) components

act compositely when under load

Note 1 to entry: Wood or other lignocellulosic materials constitute at least one of the components.

3.2
skin

flat sheet firmly connected to the core and designed to support in-plane tensile or compressive loads in a

sandwich board
Note 1 to entry: Sheets used as skins can consist of composite materials.

Note 2 to entry: Skins in sandwich boards for furniture commonly consist of particleboard (EN 309), fibreboard

(EN 316), plywood (EN 636) etc.

Note 3 to entry: If skins consist of or contain veneers (excluding decorative veneer applied to skins in faced SWB-F) or

plywood, this SWB can be considered as a core or composite plywood as defined in EN 313–2. The corresponding

standards can apply in particular, the requirements and test methods pertaining to the bonding quality.

3.3
core

centrally positioned layer of material, generally low in density, which is bonded between two skins and is

designed to support normal compressive and tensile loads and to transfer shear loads in a sandwich board

3.4
core material
homogeneous or inhomogeneous material used in manufacturing the core

Note 1 to entry: Homogeneous and inhomogeneous core materials provide continuous and discontinuous supports of

the skins, respectively. Homogeneous (e.g. balsa wood, foams) or inhomogeneous (e.g. honeycomb cores) core materials

can be isotropic or anisotropic.
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Note 2 to entry: Core materials in sandwich boards for furniture are commonly lightweight materials such as paper,

metal or composite honeycomb, open and closed cell foam, corrugated material, bonded composite tubes, or naturally

occurring materials such as balsa wood or lightweight (wood) fibre-based boards.
3.5
homogenous material

material in which on a macroscopic scale relevant properties are not a function of the position within the

material itself but may be a function of such parameters as time, direction, temperature, etc.

3.6
inhomogeneous material

material, also often referred to as non-homogeneous or structured in which on a macroscopic scale relevant

properties are a function of the position within the material itself and relevant properties may be a function of

such parameters as time, direction, temperature, etc.
3.7
isotropic
exhibiting the same physical and mechanical properties along different axes
3.8
anisotropic
not isotropic
exhibiting different physical and mechanical properties along different axes
3.9
x-axis

in sandwich boards, an axis in the plane of the skins which is used as the 0 degree reference or major axis

Note 1 to entry: The board dimension in the direction of the x-axis is referred to as the length of the board.

3.10
x-y plane
in sandwich boards, the reference plane parallel to the plane of the skins
3.11
y-axis

in sandwich boards, the axis in the plane of the skins which is perpendicular to the x-axis and which is referred

to as the minor axis

Note 1 to entry: The board dimension in the direction of the y-axis is referred to as the width of the board.

3.12
z-axis
in sandwich boards, the reference axis normal to the plane of the skins

Note 1 to entry: The board dimension in the direction of the z-axis is referred to as the thickness of the board.

3.13
structural unit

entity which is repeated periodically in an inhomogeneous core material whose properties vary along the x- or

y-axis of the sandwich board

Note 1 to entry: An example of a structural unit is a honeycomb cell in a honeycomb core or a single profile in a

corrugated core.
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3.14
factory made

mass manufactured commodity product supplied on the open market for the purpose of fabrication of furniture

components or furniture

Note 1 to entry: Factory made SWB-F can be subjected by the board manufacturer to additional value-adding

processes (e.g. application of decorative surfaces to skins, cutting of boards to customer-specific dimensions, installation

of edge-banding).

Note 2 to entry: Purpose built or custom sandwich board manufactured by a furniture producer for a specific furniture

product is not considered SWB-F as covered by this European Technical Specification.

3.15
dry conditions

conditions corresponding to service class 1 of EN 1995-1-1 which is characterized by a moisture content in

the material corresponding to a temperature of 20 °C and a relative humidity of the surrounding air only

exceeding 65 % for a few weeks per year
3.16
humid conditions

conditions corresponding to service class 2 of EN 1995-1-1 which is characterized by a moisture content in

the material corresponding to a temperature of 20 °C and a relative humidity of the surrounding air only

exceeding 85 % for a few weeks per year
3.17
furniture

moveable or permanently installed articles for lying, sitting, working and storing of goods in areas intended for

living, working, dwelling etc.
3.18
non-structural use

all general applications, e.g. furniture and fitments under conditions other than load-bearing conditions as part

of a building or other construction or such conditions under which the board constitutes a construction product

as defined by the Council Directive 89/106/EEC
3.19
faced sandwich board

sandwich board with overlaid, coated, printed or veneered decorative surfaces applied to skins

3.20
unfaced sandwich board

sandwich board without overlaid, coated, printed or veneered decorative surfaces applied to skins

3.21
overlaid sandwich board

sandwich board surfaced with one or more overlay sheets or films, for example impregnated paper, plastics,

resin film, metal
3.22
coated sandwich board

sandwich board surfaced with a coating, normally applied in liquid form, for functional or decorative purposes

3.23
veneered sandwich board
sandwich board overlaid with a (decorative) veneer
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3.24
mass per unit area

quotient of mass and area (i.e. length multiplied by width) of a piece of sandwich board expressed in

kilograms per square metres [kg/m ]
3.25
apparent density

mass per unit volume, expressed in kilograms per cubic metre [kg/m ], and based on the external dimensions

of the test piece to calculate the volume which is an average density of material and any hollow spaces

(pores, cells, channels etc.)
3.26
peel resistance

average force measured along the bond line, required to separate progressively the two members of a bonded

test piece under specified conditions of test
4 Classification
4.1 General

Sandwich boards can be classified according to different criteria. It is not possible to present an exhaustive

classification system.

In this European Technical Specification, a combined system of criteria is presented for the classification of

sandwich boards for furniture.
4.2 Classification according to board lay-up
— honeycomb sandwich board;
— solid core sandwich board;
— foam core sandwich board.
4.3 Classification according to surface appearance
— unfaced sandwich board;
— faced sandwich board.
4.4 Classification according to conditions of use
— dry conditions;
— humid conditions.
4.5 Classification according to application purposes
— sandwich boards for vertical elements in furniture;
— sandwich boards for horizontal elements in furniture;
— sandwich boards for front elements in furniture;

NOTE Front elements in furniture most commonly act as doors; thus the ability to install hardware in front elements is

often of vital importance.
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5 Symbols
5.1 General

Different symbols are used for addressing different types of sandwich boards for furniture.

5.2 Symbols related to conditions of use

Table 1 specifies the symbols which shall be used to indicate the conditions of use.

Table 1 — Symbols related to conditions of use
Conditions of use Symbol
Dry conditions no symbol
Humid conditions H
5.3 Symbols related to specific applications

Table 2 specifies the symbols which shall be used to indicate the board application in furniture manufacturing.

Table 2 — Symbols related to board application in furniture manufacturing
Board application in furniture Symbol
manufacturing
general purpose no symbol
vertical elements VE
horizontal elements HE
front elements FE
5.4 Combination of symbols for identification of sandwich boards

The symbols indicating conditions of use and application purposes are added to the symbol “SWB-F” for

sandwich board for furniture after a full stop, in this sequence:
“SWB-F” condition of use application purpose
EXAMPLE 1 SWB-F.H.FE

sandwich board for furniture to be used in humid conditions as front elements (e.g. for doors in bathroom furniture)

EXAMPLE 2 SWB-F
sandwich board for furniture to be used in dry conditions for general purposes
6 Conditioning and test conditions

Unless otherwise stated in this European Technical Specification the test pieces shall be conditioned to

constant mass in an atmosphere with a relative humidity of (65 ± 5) % and a temperature of (20 ± 2) °C.

Constant mass is considered to be reached when the results of two successive weighing operations, carried

out at an interval of 24 h, do not differ by more than 0,1 % of the mass of the test piece.

Unless otherwise stated in this European Technical Specification tests should be carried out at ambient room

temperature and no requirements pertaining to the relative humidity during testing apply. However, if the

ambient conditions of testing are not the same as those in the conditioning chamber, tests shall be undertaken

immediately after the test pieces have been removed from the conditioning chamber.

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7 Sampling, preparation and handling of test pieces and expression of test results

7.1 General requirements

Sampling, cutting of test pieces (also referred to as test pieces) and expression of test results shall be carried

out according to EN 326-1.

Unless otherwise stated in this European Technical Specification the minimum number of test pieces m to be

tested for determination of the respective property shall be taken from Table 3.

Table 3 — Minimum number of test pieces m which have to be tested to determine properties of

sandwich boards
Property Reference to test method Minimum number of test pieces m
Moisture content 8.2.2 4
Apparent density and mass per 8.2.3 6
unit area
Linear expansion due to changes 8.2.4 4
in relative humidity
Behaviour under humidity 8.2.5 2
variations in successive uniform
climates
Moisture resistance 8.2.6 see respective test method
Bending test 8.3.1.2 6
Bending properties of sandwich 8.3.1.3 5
board for shelving and similar
applications
Surface soundness 8.3.2 8
Flatwise compressive behaviour 8.3.3.1 10
Resistance to a concentrated 8.3.3.2 10
static point load
Resistance to a concentrated 8.3.3.3 10
static load applied in close
proximity to the board edge
Impact resistance 8.3.4 see respective test method
Shear strength 8.3.5 6
Resistance of the board edge with 8.4.3.2 6
edgebanding against a static
concentrated load
Peel resistance of edge-banding 8.4.3.3 6
Determination of axial withdrawal 8.4.4.2 10
resistance of fastener
Pull through resistance of 8.4.4.3 10
fasteners
Load bearing capacity of shelf 8.4.4.4 10
supports
Shear resistance of a grooved 8.4.5 10
board
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In order to determine properties, which differ with respect to the x-axis and the y-axis of the board, two groups

of m test pieces shall be tested. For the purpose of ensuring and demonstrating compliance with specific

requirements in factory production control, testing can be limited to test pieces with the known weakest

orientation in the plane of the board.

7.2 Testing of SWB-F in combination with auxiliary material(s) or after execution of

additional processing steps

For certain purposes (e.g. evaluation of properties of SWB-F for a very specific application or furniture design)

it may be desirable to evaluate properties of SWB-F in combination with auxiliary materials or after the

execution of further processing steps which are to be applied to the respective SWB-F in the manufacturing of

furniture or furniture components.

Examples of such auxiliary materials and/or processing steps are the installation of edge reinforcements

and/or edge banding, the application of decorative surface finishes etc. The respective auxiliary materials

and/or processing steps etc. have to be specified and described in the test report. Test results are only

applicable to the tested SWB-F in combination with the specified auxiliary material and/or processing steps.

7.3 Test piece size

Unless other specifications are provided in this European Technical Specification for the respective test

method the test piece size shall be as follows:

The test piece shall be square. The side length of the test piece shall measure 100 mm. The thickness of the

test pieces shall be equal to the thickness of the sandwich board. For a sandwich board with

...

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