SIST EN 15283-1:2008
Gypsum boards with fibrous reinforcement - Definitions, requirements and test methods - Part 1: Gypsum boards with mat reinforcement
Gypsum boards with fibrous reinforcement - Definitions, requirements and test methods - Part 1: Gypsum boards with mat reinforcement
This European Standard specifies the characteristics and performance of gypsum boards with mat reinforcement 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 boards with mat reinforcement 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, ventilation and smoke extraction ducts, cable trays 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 boards with mat reinforcement: 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 boards with mat reinforcement 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 1: Gipsplatten mit Vliesarmierung
Diese Europäische Norm legt Eigenschaften und Leistungsmerkmale für Gipsplatten mit Vliesarmierung 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 Gipsplatten mit Vliesarmierung 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, Lüftungs- und Rauchabzugskanäle, Kabeltragschienen 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 Gipsplatten mit Vliesarmierung hergestellt wurden: 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 Europäische Norm 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 Gipsplatten mit Vliesarmierung, 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 1: Plaque de plâtre armée d'un tissu
La présente Norme européenne spécifie les caractéristiques et performances des plaques de plâtre armées de tissu conçues pour être utilisées dans des ouvrages de construction, y compris dans des opérations de fabrication secondaires. Il inclut les plaques destinées à recevoir directement une finition sur leur face ou un enduit au plâtre. Les plaques de plâtre sont sélectionnées pour leur utilisation conformément à leur type, taille, épaisseur et 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 par ailleurs être utilisées pour les sols, la ventilation et les conduits de désenfumage, les chemins de câble et la pose sous bardage. La présente Norme européenne couvre les caractéristiques de performance suivantes : réaction au feu, perméabilité à la vapeur d’eau, résistance à la flexion et résistance thermique. Les caractéristiques de performance suivantes sont liées aux systèmes assemblés à l’aide de plaques de plâtre armées de tissu : résistance au cisaillement, au choc, isolation acoustique aux bruits aériens, absorption acoustique. Au besoin, il convient d’effectuer des essais selon les méthodes d'essai européennes correspondantes sur des systèmes assemblés qui simulent les conditions d'utilisation finale. Elle couvre également les caractéristiques techniques supplémentaires qui sont importantes en vue de l’utilisation et de l’acceptation du produit ainsi que les essais de référence de ces caractéristiques. Elle traite de l’évaluation de la conformité des produits à la présente Norme. La présente Norme européenne ne couvre pas les plaques de plâtre armées de tissu qui ont subi des opérations de transformation secondaires (par exemple les complexes d'isolation, les plaques avec revêtements minces, etc.). Les produits traités par l’EN 520 ou l’EN 13815 sont exclus.
Mavčne plošče, ojačene z vlakni - Definicije, zahteve in preskusne metode - 1. del: Mavčne plošče, ojačene z mrežo iz vlaken
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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 1: Gypsum boards with mat reinforcementPlaques de plâtre armées de fibres - Définitions, spécifications et méthodes d'essai - Partie 1: Plaque de plâtre armée d'un tissuFaserverstärkte Gipsplatten - Definitionen, Anforderungen und Prüfverfahren - Teil 1: Gipsplatten mit VliesarmierungTa slovenski standard je istoveten z:EN 15283-1:2008SIST EN 15283-1:2008en,fr,de91.100.10ICS:SLOVENSKI
STANDARDSIST EN 15283-1:200801-april-2008
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15283-1February 2008ICS 91.100.10 English VersionGypsum boards with fibrous reinforcement - Definitions,requirements and test methods - Part 1: Gypsum boards withmat reinforcementPlaques de plâtre armées de fibres - Définitions,spécifications et méthodes d'essai - Partie 1: Plaques deplâtre armées d'un tissuFaserverstärkte Gipsplatten - Begriffe, Anforderungen undPrüfverfahren - Teil 1: Gipsplatten mit VliesarmierungThis 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 15283-1:2008: E
EN 15283-1:2008 (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 (expressed as water vapour resistance factor).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 boards with mat reinforcement with reduced water absorption rate Type H1 and H2.13 4.9 Additional requirements for gypsum boards with mat reinforcement with enhanced surface hardness Type I.13 4.10 Additional requirements for gypsum boards with mat reinforcement with improved core cohesion at high temperature Type F.13 4.11 Impact resistance.14 5 Test methods.14 5.1 Sampling.14 5.2 Determination of width.14 5.3 Determination of length.15 5.4 Determination of thickness.15 5.5 Determination of squareness.16 5.6 Determination of flexural breaking load.18 5.7 Determination of deflection under load.19 5.8 Determination of total water absorption.20 5.9 Determination of surface hardness of the board.20 6 Evaluation of conformity.23 6.1 General.23 6.2 Initial type testing.23 6.3 Factory production control.23 7 Designation of gypsum boards with mat reinforcement.24 8 Marking, labelling and packaging.25 Annex A (informative)
Sampling procedure for testing.26 A.1 General.26 A.2 Sampling procedure.26 Annex B (normative)
Mounting and fixing for testing according to EN 13823 (SBI test).28 B.1 General applications.28 B.2 Limited applications regarding joint filling.30 B.3 Limited applications regarding wood based substrates.31
EN 15283-1:2008 (E) 3 Annex ZA (informative)
Clauses of this European Standard addressing the provisions of EU Construction Products Directive.32 ZA.1 Scope and relevant characteristics.32 ZA.2 Procedure of attestation of conformity of gypsum boards with mat reinforcement.34 ZA.3 CE marking and labelling.37
EN 15283-1:2008 (E) 4 Foreword This document (EN 15283-1:2008) 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 15283-1:2008 (E) 5
Diagram 1 — Families of gypsum products
EN 15283-1:2008 (E) 6
Diagram 2 — Family of ancillary products
EN 15283-1:2008 (E) 7 Introduction Gypsum boards with mat reinforcement are composed of set gypsum plaster core reinforced with fibres which may be inorganic and/or organic, and are arranged in a woven or non-woven mat to form flat rectangular boards. Admixtures, fillers and fibres dispersed in the core may also be present. They are usually continuously produced on an industrial scale. The properties of gypsum boards with mat reinforcement make them particularly suitable for use in situation where there are requirements for fire protection, sound, thermal insulation or racking strength. Gypsum boards with mat reinforcement can be fixed by various methods e.g. nailing, screwing, stapling or sticking with gypsum based or other adhesives. They can also be inserted in a suspended ceiling system or laid in floor constructions. Gypsum boards with mat reinforcement can be finished with direct surface decoration or gypsum plaster. They can be further processed into a range of other products.
EN 15283-1:2008 (E) 8 1 Scope This European Standard specifies the characteristics and performance of gypsum boards with mat reinforcement 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 boards with mat reinforcement are selected for use according to their type, size, thickness and edge profile. The boards can 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 can be for floors, ventilation and smoke extraction ducts, cable trays 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 boards with mat reinforcement: shear strength, fire resistance, impact resistance, direct airborne sound insulation, acoustic absorption. If required, tests should 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 the evaluation of conformity of the product to this EN. This European Standard does not cover gypsum boards with mat reinforcement 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. 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 520:2004, Gypsum plasterboards — Definitions, requirements and test methods EN 12524, Building materials 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 15283-1:2008 (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 354:2003) 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 boards with mat reinforcement board composed of a gypsum core firmly bonded to a woven or non-woven sheet of inorganic or organic fibres located on or just below the surfaces. The sheet may consist of single or multiple layers and may be reinforced by filaments or webs of fibre strands. The surfaces may vary according to the use and the core can also contain fibres, additives and/or fillers to impart additional properties. Gypsum boards with fibrous mat reinforcement are usually continuously produced on an industrial scale. The surfaces and edge profiles vary according to the use of the particular type of board. For the purposes of identification these boards receive the designation GM 3.2 Additional features of gypsum fibre boards 3.2.1 additional features of gypsum boards with mat reinforcement performance of the types of gypsum boards with mat reinforcement defined below can be combined in one board in which case the letter identifying each type of performance satisfied is given in the designation 3.2.2 gypsum boards with mat reinforcement with reduced water absorption rate gypsum boards with mat reinforcement can 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 purpose of identification these boards are designated GM-H1, GM-H2 with different water absorption performance 3.2.3 gypsum boards with mat reinforcement with enhanced surface hardness boards can have enhanced surface hardness for special applications. For the purpose of identification these boards receive the designation GM-I 3.2.4 gypsum boards with mat reinforcement with enhanced strength boards can have enhanced strength for special applications. For the purpose of identification these boards receive the designation GM-R
EN 15283-1:2008 (E) 10 3.2.5 gypsum boards with mat reinforcement with improved core adhesion at high temperature these boards can have mineral fibres and/or other additives in the gypsum core to improve core cohesion at high temperatures. For the purpose of identification these boards receive the designation GM-F 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 boards with mat reinforcement The edges may be square, tapered, bevelled, half-rounded, rounded, skewed or tongue and grooved, or a combination of each. Sketches of some common edge profiles are given in EN 520. The ends of gypsum boards with mat reinforcement are usually square. Other types of profile may be produced for special applications
EN 15283-1:2008 (E) 11 4 Requirements 4.1 Mechanical characteristics 4.1.1 Flexural strength The flexural strength shall be expressed as the breaking load in Newtons. The flexural breaking load of gypsum boards with mat reinforcement determined in accordance with the test method described in 5.6 shall not be less than the values given below, where t is the thickness of the board in mm. Table 1 — Flexural breaking load in Newtons Nominal board thickness Flexural breaking load mm N Type
Transverse direction Longitudinal direction GM, GM-H1, GM-H2, GM-I, GM-F
t 16,8 ⋅ t 43 ⋅ t GM-R t 24 ⋅ t 58 ⋅ t Additionally, no individual result shall be more than 10 % below these values. 4.1.2 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. 4.1.3 Shear strength (strength of bond/substructure connection) When the intended use of gypsum boards with mat reinforcement 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 given in EN 520. NOTE 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. 4.2 Fire behaviour 4.2.1 Reaction to fire When the intended use of gypsum boards with mat reinforcement is for exposed situations in building construction works, gypsum boards with mat reinforcement shall be classified in accordance with EN 13501-1. When testing the gypsum boards with mat reinforcement in the EN 13823 test according to the provisions of EN 13501-1 is required, the product shall be mounted in a manner which is representative of end use applications. The method for mounting shall be as Annex B. 4.2.2 Resistance to fire Resistance to fire is a property of an assembled system and not of a product in isolation. When required and subject to regulatory requirement, the fire resistance of a system including gypsum boards with mat reinforcement shall be classified in accordance with EN 13501-2.
EN 15283-1:2008 (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 requirement, the direct airborne sound insulation of a system including gypsum boards with mat reinforcement 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 (expressed as water vapour resistance factor) When the intended use of gypsum boards with mat 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 NOTE Common nominal widths are: 900 mm, 1 200 mm and 1 250 mm. Other widths are also possible. The width shall be measured as described in 5.2 and compared to the nominal width. The tolerance shall be +0/ - 4 mm. 4.7.2 Length The length shall be measured as described in 5.3 and compared to the nominal length.
EN 15283-1:2008 (E) 13 The tolerance shall be +0/- 5 mm for each individual measurement. 4.7.3 Thickness NOTE The common nominal thicknesses are 12,5 mm, 15 mm, 20 mm and 25 mm. Other nominal thicknesses are also possible and shall be at least 6,0 mm nominal.
The thickness shall be measured as described in 5.4 and compared to the nominal thickness. Tolerances for thickness below 18 mm shall be ± 0,7 mm. For boards of thickness equal to or greater than 18 mm, the tolerance shall be ± (0,04 x thickness) (in mm). The difference between individual thickness measurements on any individual board shall not exceed 0,8 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. 4.7.5 Edge and end profiles The edge and end profiles may vary widely depending upon the jointing system and decorative and aesthetic considerations. The exception is the tapered edge and the half-rounded tapered edge profile. When measured as described in 5.6 of EN 520:2004, each individual reading shall be between the following limits: depth of taper: between 0,6 mm and 2,5 mm; width of taper: between 40 mm and 80 mm. 4.8 Additional requirements for gypsum boards with mat reinforcement with reduced water absorption rate Type H1 and H2 The total water absorption of boards, determined by the method described in 5.8, shall not be greater than 5 %. for type H1 and 10 % for type H2. 4.9 Additional requirements for gypsum boards with mat reinforcement with enhanced surface hardness Type 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 5.9. The diameter of the depression shall not be more than 15 mm. 4.10 Additional requirements for gypsum boards with mat reinforcement with improved core cohesion at high temperature Type F When a type F board (or combined) is subjected to the test described in 5.10 of EN 520:2004, none of the six specimens shall break.
EN 15283-1:2008 (E) 14 4.11 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 boards with mat reinforcement shall be determined in accordance with ISO 7892. 5 Test methods 5.1 Sampling Testing shall require three boards of each type and thickness on which tests 5.2 to 5.5 shall be carried out. Tests 5.6 to 5.9 shall be carried out on specimens cut out from the same three boards. The Annex A gives an example of 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 millimetre, one near each end and one near the middle of the board.
Figure 1 — Determination of width
EN 15283-1:2008 (E) 15 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.
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 is 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 15283-1:2008 (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 measured. Method b: The two diagonals of a board are measured. 5.5.2 Apparatus A metal rule or tape with 1 mm divisions. 5.5.3 Procedure 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.
EN 15283-1:2008 (E) 17
Figure 4 — Determination of squareness of ends Method b: Measure the length (l) and the width (w) of the board and the lengths of the two diagonals d1 and d2 to the nearest mm. 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. Method b: The squareness S is expressed by the result of the expression: wlddddS.4)21(.)21(−+= (1) For the calculations, the width (w) shall be expressed in metres, all other parameters in millimetres.
EN 15283-1:2008 (E) 18 5.6 Determination of flexural breaking load
5.6.1 Principle The flexural strength of boards is characterised by the flexural breaking load. Specimens 400 mm x 300 mm cut off the boards are subjected to a known load which is increased at a controlled rate until failure occurs. 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 two specimens from each board with all edges square (as shown in Figure 5). One specimen is taken in the longitudinal direction (designated L) and the other in the transverse direction (designated T) (see Figure 5). Cut the specimens at least 100 mm from the ends and edges of the b
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