SIST EN 15283-2:2008
Gypsum boards with fibrous reinforcement - Definitions, requirements and test methods - Part 2: Gypsum fibre boards
Gypsum boards with fibrous reinforcement - Definitions, requirements and test methods - Part 2: Gypsum fibre boards
Part 2 of this European Standard specifies the characteristics and performance of gypsum fibre boards intended to be used in building construction works including those intended for secondary manufacturing operations. It includes boards designed to receive either direct surface decoration or gypsum plaster.
Gypsum fibre boards are selected for use according to their type, size, thickness and edge profile. The boards may be used for example to provide dry lining finishes to walls, to fixed and suspended ceilings, to partitions, or as cladding to structural columns and beams. Other uses may be for floors and sheathing applications.
This standard covers the following product performance characteristics: reaction to fire, water vapour permeability, flexural strength, and thermal resistance.
The following performance characteristics are linked to systems assembled with gypsum fibre boards: shear strength, fire resistance, impact resistance, direct airborne sound insulation, acoustic absorption. If required, tests have to be done according to the corresponding European test methods on assembled systems simulating the end use conditions.
This EN covers also additional technical characteristics that are of importance for the use and acceptance of the product by the Construction Industry and the reference tests for these characteristics.
It provides for the evaluation of conformity of the product to this EN.
This standard does not cover gypsum fibre boards which have been subject to any secondary manufacturing operations (e.g. insulating composite panels, boards with thin lamination, etc.)
Products covered by EN 520 or EN 13815 are excluded.
Faserverstärkte Gipsplatten - Definitionen, Anforderungen und Prüfverfahren - Teil 2: Gipsfaserplatten
Teil 2 dieser Europäische Norm legt Eigenschaften und Leistungsmerkmale für Gipsfaserplatten fest, die für die Verwendung im Hochbau vorgesehen sind, einschließlich derer, die zur Weiterverarbeitung bestimmt sind. Es gilt auch für Platten, die zur direkten Aufnahme einer dekorativen Beschichtung oder eines Gipsputzes vorgesehen sind.
Hinsichtlich ihrer Anwendung werden Gipsfaserplatten nach ihrer Art, Größe, Dicke und Kantenausbildung ausgewählt. Die Platten können z. B. als Trockenputz für Wände, für direkt befestigte Deckenbekleidungen oder abgehängte Decken, für Trennwände oder als Bekleidung von Stützen und Trägern verwendet werden. Sie können auch für Böden und Beplankungen eingesetzt werden.
Diese Norm erfasst folgende Leistungsmerkmale des Produktes: Brandverhalten, Wasserdampfdurchlässigkeit, Biegezugfestigkeit und Wärmedurchlasswiderstand.
Die folgenden Leistungsmerkmale beziehen sich auf Systeme, die unter Verwendung von Gipsfaserplatten hergestellt wurden: Scherfestigkeit, Feuerwiderstand, Stoßfestigkeit, direkte Luftschalldämmung und Schallabsorption. Falls gefordert, sind die Prüfungen nach den entsprechenden europäischen Prüfverfahren an zusammengebauten Systemen, die die praktischen Anwendungsbedingungen simulieren, durchzuführen.
Diese EN behandelt auch zusätzliche technische Eigenschaften, die für die Anwendung und Akzeptanz des Produktes durch die Bauindustrie wichtig sind; es enthält auch die Referenzprüfverfahren für diese Eigenschaften.
Ferner legt es die Bewertung der Konformität des Produktes mit dieser EN fest.
Diese Norm gilt nicht für Gipsfaserplatten, die weiterverarbeitet wurden (z. B. zu Verbundplatten zur Schall- und Wärmedämmung, Gipsplatten mit dünner Beschichtung usw.).
Produkte, die in EN 520 oder EN 13815 behandelt werden, sind ausgeschlossen.
Plaques de plâtre armées de fibres - Définitions, spécifications et méthodes d'essai - Partie 2: Plaques de plâtre fibrées
La présente Norme européenne spécifie les caractéristiques et les performances des plaques de plâtre fibrées conçues pour être utilisées dans des ouvrages de construction y compris celles conçues pour des opérations de fabrication secondaires. Elle inclut les plaques destinées à recevoir directement une finition sur leur surface ou un enduit au plâtre. Les plaques de plâtre fibrées sont sélectionnées pour leur utilisation conformément à leur type, à leur taille et à leur épaisseur, ainsi qu’au profil des bords. Les plaques peuvent être utilisées par exemple pour créer une finition par habillage des murs, des plafonds fixes et suspendus, des cloisons, ou pour la protection et l’habillage des poteaux et des poutres. Elles peuvent également être utilisées pour la pose en sous bardage. La présente Norme européenne couvre les caractéristiques de performance suivantes du produit : réaction au feu, perméabilité à la vapeur d’eau, résistance à la flexion et résistance thermique. Les caractéristiques de performance suivantes sont liées à des systèmes assemblés avec des plaques de plâtre fibrées : résistance au cisaillement, résistance au feu, résistance aux chocs, isolation acoustique aux bruits aériens, absorption acoustique. Au besoin, des essais doivent être effectués conformément aux méthodes d'essai européennes correspondantes sur des systèmes assemblés qui simulent les conditions d'utilisation finale. La présente norme européenne couvre également les caractéristiques techniques supplémentaires qui ont une incidence sur l’utilisation et la réception du produit, ainsi que les essais de référence de ces caractéristiques. Elle permet l’évaluation de la conformité du produit à la présente EN. La présente Norme européenne ne couvre pas les plaques de plâtre fibrées qui ont subi des opérations de transformation secondaires diverses (par exemple les complexes d’isolation, les plaques avec revêtements minces etc.).
Mavčne plošče, ojačene z vlakni - Definicije, zahteve in preskusne metode - 2. del: Mavčne plošče z vlakni
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Gypsum boards with fibrous reinforcement - Definitions, requirements and test methods - Part 2: Gypsum fibre boardsPlaques de plâtre armées de fibres - Définitions, spécifications et méthodes d'essai - Partie 2: Plaques de plâtre fibréesFaserverstärkte Gipsplatten - Definitionen, Anforderungen und Prüfverfahren - Teil 2: GipsfaserplattenTa slovenski standard je istoveten z:EN 15283-2:2008SIST EN 15283-2:2008en,fr,de91.100.10ICS:SLOVENSKI
STANDARDSIST EN 15283-2:200801-april-2008
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15283-2February 2008ICS 91.100.10 English VersionGypsum boards with fibrous reinforcement - Definitions,requirements and test methods - Part 2: Gypsum fibre boardsPlaques de plâtre armées de fibres - Définitions,spécifications et méthodes d'essai - Partie 2: Plaques deplâtre fibréesFaserverstärkte Gipsplatten - Begriffe, Anforderungen undPrüfverfahren - Teil 2: GipsfaserplattenThis European Standard was approved by CEN on 28 December 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15283-2:2008: E
EN 15283-2:2008 (E) 2 Contents Page Foreword.4 Introduction.7 1 Scope.8 2 Normative references.8 3 Terms and definitions.9 4 Requirements.11 4.1 Mechanical characteristics.11 4.2 Fire behaviour.11 4.3 Acoustic properties.12 4.4 Water vapour permeability / water vapour resistance (expressed as water vapour resistance factor) question for the mandate.12 4.5 Thermal resistance (expressed as thermal conductivity).12 4.6 Dangerous substances.12 4.7 Dimensions and tolerances.12 4.8 Additional requirements for gypsum fibre boards with reduced surface water absorption types GF-W1 and GF-W2.13 4.9 Additional requirements for gypsum fibre boards with reduced water absorption rate.13 4.10 Additional requirements for gypsum fibre boards with enhanced density type GF-D.13 4.11 Additional requirements for gypsum fibre boards with enhanced surface hardness type GF-I.13 4.12 Impact resistance.13 5 Test methods.13 5.1 Sampling.13 5.2 Determination of width.14 5.3 Determination of length.14 5.4 Determination of thickness.15 5.5 Determination of squareness.16 5.6 Determination of flexural strength (bending strength).18 5.7 Determination of deflection under load.20 5.8 Determination of surface water absorption.21 5.9 Determination of total water absorption.22 5.10 Determination of density.22 5.11 Determination of surface hardness of the board.23 5.12 Determination of shear strength (strength of board/substructure connection).25 6 Evaluation of conformity.27 6.1 General.27 6.2 Initial type testing.27 6.3 Factory production control.27 7 Designation of gypsum fibre boards.28 8 Marking, labelling and packaging.29 Annex A (informative)
Sampling procedure for testing.30 A.1 General.30 A.2 Sampling procedure.30 Annex B (normative)
Mounting and fixing for testing according to EN 13823 (SBI).31
EN 15283-2:2008 (E) 3 Annex ZA (informative)
Clauses of this European Standard addressing the provisions of EU Construction Products Directive.33 ZA.1 Scope and relevant characteristics.33 ZA.2 Procedure of attestation of conformity of gypsum fibre boards.34 ZA.3 CE marking and labelling.37 Bibliography.40
EN 15283-2:2008 (E) 4 Foreword This document (EN 15283-2:2008) has been prepared by Technical Committee CEN/TC 241 “Gypsum and gypsum based products”, the secretariat of which is held by AFNOR. 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 August 2008, and conflicting national standards shall be withdrawn at the latest by November 2009. 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. This standard includes two parts: Part 1: Gypsum boards with mat reinforcement Part 2: Gypsum fibre boards This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association and supports essential requirements of EU Directive 89/106. For relationship with EU Directive(s) see informative Annex ZA which is an integral part of this document. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
EN 15283-2:2008 (E) 5
Diagram 1 — Families of gypsum products
EN 15283-2:2008 (E) 6
Diagram 2 — Family of ancillary products
EN 15283-2:2008 (E) 7 Introduction Gypsum fibre boards are composed of set gypsum plaster core reinforced with fibres which may be inorganic and/or organic, dispersed in the core to form flat rectangular boards. Admixtures and fillers may also be present. They are usually continuously produced on an industrial scale. The properties of gypsum fibre boards make them particularly suitable for use in situations where there are requirements for fire protection, sound, thermal insulation or shear strength. Gypsum fibre boards may be fixed by various methods e.g. nailing, screwing, stapling or sticking with gypsum based or other adhesives. They may also be inserted in a suspended ceiling system or laid in floor constructions. Gypsum fibre boards may be finished with direct surface decoration or gypsum plaster. They may be further processed into a range of other products.
EN 15283-2:2008 (E) 8 1 Scope This European Standard specifies the characteristics and performance of gypsum fibre boards intended to be used in building construction works including those intended for secondary manufacturing operations. It includes boards designed to receive either direct surface decoration or gypsum plaster. Gypsum fibre boards are selected for use according to their type, size, thickness and edge profile. The boards may be used for example, to provide dry lining finishes to walls, to fixed and suspended ceilings, to partitions, or as cladding to structural columns and beams. Other uses may be for floors and sheathing applications. This European Standard covers the following product performance characteristics: reaction to fire, water vapour permeability, flexural strength, and thermal resistance. The following performance characteristics are linked to systems assembled with gypsum fibre boards: shear strength, fire resistance, impact resistance, direct airborne sound insulation, acoustic absorption. If required, tests have to be done according to the corresponding European test methods on assembled systems simulating the end use conditions. This European Standard also covers additional technical characteristics that are of importance for the use and acceptance of the product and the reference tests for these characteristics. It provides for evaluation of conformity of the product to this EN. This European Standard does not cover gypsum fibre boards that have been subject to any secondary manufacturing operations (e.g. insulating composite panels, boards with thin lamination etc.). Products covered by EN 520 or EN 13815 are excluded. 2 Normative references The following referenced documents are indispensable for the application 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 338:2003, Structural timber – Strength classes EN 12524, Building material and products — Hygrothermal properties — Tabulated design values EN 12664, Thermal performance of building materials and products — Determination of thermal resistance by means of guarded hot plate and heat flow meter methods — Dry and moist products of medium and low thermal resistance EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification using data from reaction to fire tests EN 13501-2, Fire classification of construction products and building elements — Part 2: Classification using data from fire resistance tests, excluding ventilation services EN 13823, Reaction to fire tests for building products — Building products excluding floorings exposed to the thermal attack by a single burning item EN 13963, Jointing materials for gypsum plasterboards — Definitions, requirements and test methods
EN 14195, Metal framing components for gypsum plasterboard systems — Definitions, requirements and test methods EN 20535, Paper and board — Determination of water absorptiveness — Cobb method (ISO 535:1991)
EN 15283-2:2008 (E) 9 EN ISO 140-3, Acoustics — Measurement of sound insulation in buildings and of building elements — Part 3: Laboratory measurements of airborne sound insulation of building elements (ISO 140-3:1995) EN ISO 354, Acoustics — Measurement of sound absorption in a reverberation room (ISO 354:1985) EN ISO 717-1, Acoustics — Rating of sound insulation in buildings and of building elements — Part 1: Airborne sound insulation (ISO 717-1:1996) EN ISO 9001, Quality management systems — Requirements (ISO 9001:2000) EN ISO 12572, Hygrothermal performance of building materials and products — Determination of water vapour transmission properties (ISO 12572:2001) ISO 7892, Vertical building elements — Impact resistance tests — Impact bodies and general test procedures 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 gypsum fibre boards gypsum fibre boards are composed of set gypsum plaster reinforced with dispersed fibres, which may be inorganic and/or organic, to form flat rectangular boards. They may contain additives and/or fillers to impart additional properties. The surfaces may vary according to the use. The edges and the ends may be profiled to suit the application. Gypsum fibre boards are usually continuously produced on an industrial scale. For the purposes of identification these boards receive the designation GF 3.2 Additional features of gypsum fibre boards 3.2.1 gypsum fibre boards with reduced water absorption rate gypsum fibre boards may have additives to reduce the water absorption rate which make them suitable for special applications in which reduced water absorption properties are required to improve the performance of the board. For the purposes of identification these boards receive the additional designation GF-H 3.2.2 gypsum fibre boards with reduced surface water absorption gypsum fibre boards may have additives to reduce the surface water absorption which make them suitable for special applications in which reduced water absorption properties are required to improve the performance of the board. For the purposes of identification, these boards receive the additional designation GF-W1, GF-W2 with different surface water absorption performance 3.2.3 gypsum fibre boards with enhanced density boards may have enhanced density for special applications. For the purposes of identification these boards receive the additional designation GF-D, in accordance with their density 3.2.4 gypsum fibre boards with enhanced surface hardness boards may have enhanced surface hardness for special applications. For the purposes of identification these boards receive the additional designation GF-I
EN 15283-2:2008 (E) 10 3.2.5 gypsum fibre boards with enhanced strength boards for special applications where increased strength are required have increased bending strengths. For the purposes of identification these boards receive the additional designation GF-R1, GF-R2 with different strength performance 3.3 General terms 3.3.1 edge longitudinal side of the board 3.3.2 end side transverse to the edges 3.3.3 face surface intended to be exposed in use 3.3.4 back surface opposite to the face 3.3.5 width shortest distance between the edges of the board 3.3.6 nominal width (w) width stated by the manufacturer 3.3.7 length shortest distance between the ends of the board 3.3.8 nominal length (l) length stated by the manufacturer 3.3.9 thickness distance between the face and the back, excluding edge profiles 3.3.10 nominal thickness (t) thickness stated by the manufacturer 3.3.11 squareness (s) rectangularity of the board 3.4 Edge and end profiles of gypsum fibre boards The edges or ends of gypsum fibre boards are square, tapered, bevelled, half-rounded, rounded, skewed, or tongue and grooved, or a combination of each. Other types of profile may be produced for special applications
EN 15283-2:2008 (E) 11 4 Requirements 4.1 Mechanical characteristics 4.1.1 Shear strength (strength of bond/substructure connection) When the intended use of gypsum fibre boards is stiffening building assemblies (i.e. walls, partitions, roof truss structures) the conventional shear strength of the boards shall be determined in accordance with the test method described in 5.12. (It should be noted that this test does not measure the actual shear strength of the board but rather the strength of the board/substructure connection that is the relevant property for this application) 4.1.2 Flexural strength 4.1.2.1 The flexural strength is expressed as bending strength in Newtons per square millmetre. 4.1.2.2 The bending strength of gypsum fibre boards determined as described in 5.6, shall not be less than the values given below. The bending strength shall be 5,5 N/mm2 for all thicknesses below 18 mm. For boards of 18 mm and above it shall be 5,0 N/mm2. In addition, no individual result shall be more than 10 % below these values. 4.1.2.3 Bending strength of gypsum fibre boards with enhanced strength (types GF-R1 and GF-R2). The bending strength shall be at least 8,0 N/mm2 for all thicknesses for type GF-R2. The bending strength shall be at least 10,0 N/mm2 for all thicknesses for type GF-R1. In addition, no individual result shall be more than 10 % below these values. 4.1.3 Deflection under load
When required and subject to regulatory requirements, the deflection under load shall be determined in accordance to the test method described in 5.7. The calculation of the modulus of elasticity is given in 5.7. 4.2 Fire behaviour 4.2.1 Reaction to fire When the intended use of gypsum fibre boards is for exposed situations in building construction works, the reaction to fire of gypsum fibre boards shall be classified in accordance with EN 13501-1. Testing of the gypsum fibre boards in the EN 13823 test requires the product to be mounted in a manner which is representative of end use applications. The method for mounting and fixing is given in Annex B. 4.2.2 Resistance to fire Resistance to fire is a property of an assembled system and not of the product in isolation. When required and subject to regulatory requirements, the fire resistance of a system including gypsum fibre boards shall be classified in accordance with EN 13501-2.
EN 15283-2:2008 (E) 12 4.3 Acoustic properties 4.3.1 Direct airborne sound insulation Direct airborne sound insulation is a property of an assembled system and not of the product in isolation. When required and subject to regulatory requirements, the direct airborne sound insulation of a system including gypsum fibre boards shall be determined in accordance with EN ISO 140-3 and EN ISO 717-1. 4.3.2 Acoustic absorption Acoustic absorption is a property of an assembled system and not of the product in isolation. When boards are intended to be used for acoustic conditioning, acoustic absorption shall be measured according to EN ISO 354. 4.4 Water vapour permeability / water vapour resistance (expressed as water vapour resistance factor) question for the mandate When the intended use of gypsum boards with fibrous reinforcement is for moisture diffusion control, tabulated values of water vapour resistance factor for gypsum products given in EN 12524 shall be used. When required and subject to regulatory requirement, the boards shall be tested in accordance with the method for water vapour resistance given in EN ISO 12572. 4.5 Thermal resistance (expressed as thermal conductivity) When the intended use of boards is to contribute to thermal resistance in building construction works (walls, partitions, ceilings), the tabulated values of thermal conductivity for gypsum products given in EN 12524 shall be used. When required and subject to regulatory requirement, thermal resistance shall be determined in accordance with the test method given in EN 12664. 4.6 Dangerous substances Materials used in products shall not release any dangerous substances in excess of the maximum permitted levels specified in a relevant European Standard for the material or permitted in the national regulations of the member state of destination. 4.7 Dimensions and tolerances 4.7.1 Width The width shall be measured as described in 5.2 and compared to the nominal width. The tolerance shall be + 0/- 4 mm for each individual measurement. 4.7.2 Length The length shall be measured as described in 5.3 and compared to the nominal length. The tolerance shall be 0/- 5 mm for each individual measurement. 4.7.3 Thickness Nominal thicknesses shall be greater than 4,0 mm. Two classes of tolerances exist (C1 and C2).
EN 15283-2:2008 (E) 13 The thickness shall be measured as described in 5.4 and compared to the nominal thickness. For C1 boards: The tolerance is ± 0,2 mm.
The difference between individual thickness measurements on any individual board shall not exceed 0,4 mm. For C2 boards: Tolerances for boards of nominal thickness below 15 mm are ± 0,5 mm. For boards of nominal thickness equal or greater than 15 mm, the tolerance is ± (0,05 × thickness) in mm. The difference between individual thickness measurements on any individual board shall not exceed 1,0 mm for a nominal thickness below 15 mm and shall not exceed (0,1 × thickness) for boards of nominal thickness equal or greater than 15 mm, 4.7.4 Squareness The deviation from squareness measured as described in 5.5 shall not exceed 2,5 mm per metre of width. 4.8 Additional requirements for gypsum fibre boards with reduced surface water absorption types GF-W1 and GF-W2 The surface water absorption of the water exposed sides of boards, determined by the method described in 5.8 shall not be greater than 300 g/m2 for Type GF-W1 and not greater than 1 500 g/m2 for Type GF-W2. 4.9 Additional requirements for gypsum fibre boards with reduced water absorption rate type GF-H The total water absorption of boards, determined by the method described in 5.9, shall not be greater than 5 %. 4.10 Additional requirements for gypsum fibre boards with enhanced density type GF-D The density of boards, determined by the method described in 5.10, shall be at least 1,4 × 103 kg/m3. 4.11 Additional requirements for gypsum fibre boards with enhanced surface hardness type GF-I The surface hardness of board is characterised by the diameter of the depression produced in the surface according to the test method described in 5.11. The diameter of the depression shall not be more than 15 mm. 4.12 Impact resistance NOTE Impact resistance is a characteristic dependent on an assembled system and not of the product in isolation. When required and subject to regulatory requirements, the impact resistance of a system including gypsum fibre board shall be determined in accordance with ISO 7892. 5 Test methods These methods shall be followed completely. Where they cannot be followed for practical reasons, deviation from the standard method shall be recorded with the results. 5.1 Sampling Testing requires three boards of each type and thickness on which tests 5.2 to 5.5 are carried out.
EN 15283-2:2008 (E) 14 Tests 5.6 to 5.12 are carried out on specimens cut out from the same three boards. Annex A gives an example of the sampling procedure. 5.2 Determination of width 5.2.1 Principle The width is measured at three points. 5.2.2 Apparatus A metal rule or tape graduated in millimetres and permitting a reading to 1 mm. 5.2.3 Procedure Take three measurements between the extremities of the boards (see Figure
1) to the nearest mm, one near each end and one near the middle of the board.
Figure 1 — Determination of width 5.2.4 Expression of results Each measured value expressed in millimetres is recorded. 5.3 Determination of length 5.3.1 Principle The length is measured at three points. 5.3.2 Apparatus A metal rule or tape with reading to 1 mm divisions.
EN 15283-2:2008 (E) 15
Figure 2 — Determination of length 5.3.3 Procedure Take three measurements between the extremities of the board (see Figure 2) to the nearest millimetre, one near each edge and one near the middle. 5.3.4 Expression of results Each measured value expressed in millimetres in recorded and compared to the nominal length of the board. 5.4 Determination of thickness 5.4.1 Principle The thickness of the board is measured at six points near to one end of the board. 5.4.2 Apparatus A micrometer, dial gauge, or callipers with an anvil diameter not less than 10 mm and permitting a reading to 0,05 mm. 5.4.3 Procedure Take six measurements (see Figure 3) to the nearest 0,05 mm across one end at approximately equal intervals across the width and at least 25 mm from the end and 100 mm from the edges. For boards of nominal width not greater than 600 mm, three measurements are sufficient.
EN 15283-2:2008 (E) 16 Dimensions in millimetres
Figure 3 — Determination of thickness 5.4.4 Expression of results Record each individual measurement. Record to the nearest 0,1 mm the thickness as the average of the values obtained for each board. 5.5 Determination of squareness 5.5.1 Principle Method a: Two boards are compared with each other and the squareness is measured. Method b: The two diagonals of a board are measured. 5.5.2 Apparatus A metal rule or tape with 1 mm divisions.
EN 15283-2:2008 (E) 17 5.5.3 Procedure
Figure 4 — Determination of squareness Method a: Place one board on top of another so that they coincide along one edge and at one corner (circled in Figure 4). Measure to the nearest 1 mm the distance ∆1 (see Figure 4) between the ends of the opposite edges. Turn the top board over so that the same ends coincide as for the first measurement and ensure that the corner of the top board coincides with that corner of the lower board used in the first measurement (circled in Figure 4). Measure the new distance ∆2 between the ends of the opposite edges. Method b: Measure the length (l) of the board and the lengths of the two diagonals d1 and d2 to the nearest millimetre. 5.5.4 Expression of results Method a: The squareness is characterised for one of the boards by the half sum w221∆∆+ and for other by the half difference w212∆∆+ expressed in millimetres per metre.
EN 15283-2:2008 (E) 18 Method b: The squareness S is expressed by the result of the expression: wlddddS⋅⋅−⋅+=4)21()21( (1) The width (w) is expressed in metres, all other parameters in millimetres. 5.6 Determination of flexural strength (bending strength) 5.6.1 Principle The flexural strength of boards is characterised by the bending strength. Boards are subjected to a known load which is increased at a controlled rate until failure occurs. Specimens for boards less or equal to 20 mm thickness: 400 mm × 300 mm Specimens for boards greater than 20 mm thickness: 550 mm × 300 mm 5.6.2 Apparatus A loading machine capable of being read to 2 % and capable of applying the necessary load with a rate of 250 N/min ± 125 N/min. 5.6.3 Procedure 5.6.3.1 Preparation of specimens Cut four specimens from each board where possible with all edges square (as shown in Figure 5). If the dimensions of th
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