SIST EN 16153:2013+A1:2015
(Main)Light transmitting flat multiwall polycarbonate (PC) sheets for internal and external use in roofs, walls and ceilings - Requirements and test methods
Light transmitting flat multiwall polycarbonate (PC) sheets for internal and external use in roofs, walls and ceilings - Requirements and test methods
This European Standard specifies the requirements for light transmitting flat multiwall polycarbonate (PC) sheets for internal and external use in walls, roofs and ceilings.
This European Standard applies to light transmitting flat extruded multiwall PC sheets with or without functional layers (e.g. coating, co-extruded layer) made from PC-based or other materials, without filling materials.
It also specifies the test methods needed for the evaluation of conformity and marking of the sheets.
Lichtdurchlässige, flache Stegmehrfachplatten aus Polycarbonat (PC) für Innen- und Außenanwendungen an Dächern, Wänden und Decken - Anforderungen und Prüfverfahren
Diese Europäische Norm legt die Anforderungen an lichtdurchlässige Stegmehrfachplatten aus PC für Innen- und Außenanwendungen an Dächern, Wänden und Decken fest.
Diese Europäische Norm gilt für lichtdurchlässige extrudierte Stegmehrfachplatten aus PC mit oder ohne Funk¬tionsschicht(en) (z. B. Beschichtung, koextrudierte Schicht) aus PC-basierten oder anderen Materialien ohne Füllmaterialien.
Außerdem legt sie die für die Konformitätsbewertung und die Kennzeichnung der Platten erforderlichen Prüf-verfahren fest.
Plaques d’éclairement multiparois et planes en polycarbonate (PC) pour usage intérieur ou extérieur dans les toitures, bardages et plafonds - Exigences et méthodes d’essai
La présente Norme européenne spécifie les exigences relatives aux plaques d'éclairement planes multi-parois en polycarbonate (PC) destinées à un usage intérieur ou extérieur dans les bardages, toitures et plafonds.
La présente Norme européenne s'applique aux plaques d'éclairement planes multi-parois extrudées en PC, avec ou sans couches fonctionnelles (par exemple, revêtement, couche co-extrudée) en matériaux à base de PC ou autres matériaux, sans matériaux de remplissage.
Elle spécifie également les méthodes d'essai nécessaires pour l'évaluation de la conformité ainsi que le marquage des plaques.
Prosojne ploščate večslojne polikarbonatne (PC) plošče za notranje in zunanje strehe, stene in strope - Zahteve in preskusne metode
Ta evropski standard določa zahteve za prosojne ploščate večslojne polikarbonatne (PC) plošče za notranje ter zunanje stene, strehe in strope.
Ta evropski standard se uporablja za prosojne ploščate ekstrudirane večslojne polikarbonatne plošče s funkcijskimi sloji ali brez njih (npr. premaz, koekstrudirani sloj) iz polikarbonatnih ali drugih materialov, brez polnil.
Določa tudi preskusne metode, potrebne za vrednotenje skladnosti, in označevanje plošč.
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Lichtdurchlässige, flache Stegmehrfachplatten aus Polycarbonat (PC) für Innen- und Außenanwendungen an Dächern, Wänden und Decken - Anforderungen und PrüfverfahrenPlaques d’éclairement multiparois et planes en polycarbonate (PC) pour usage intérieur ou extérieur dans les toitures, bardages et plafonds - Exigences et méthodes d’essaiLight transmitting flat multiwall polycarbonate (PC) sheets for internal and external use in roofs, walls and ceilings - Requirements and test methods91.060.01Stavbni elementi na splošnoElements of buildings in general83.140.10Filmi in folijeFilms and sheetsICS:Ta slovenski standard je istoveten z:EN 16153:2013+A1:2015SIST EN 16153:2013+A1:2015en,fr,de01-maj-2015SIST EN 16153:2013+A1:2015SLOVENSKI
STANDARDSIST EN 16153:20131DGRPHãþD
SIST EN 16153:2013+A1:2015
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16153:2013+A1
March 2015 ICS 83.140.10; 91.060.01 Supersedes EN 16153:2013English Version
Light transmitting flat multiwall polycarbonate (PC) sheets for internal and external use in roofs, walls and ceilings - Requirements and test methods
Plaques d'éclairement multiparois et planes en polycarbonate (PC) pour usage intérieur ou extérieur dans les toitures, bardages et plafonds - Exigences et méthodes d'essai
Lichtdurchlässige, flache Stegmehrfachplatten aus Polycarbonat (PC) für Innen- und Außenanwendungen an Dächern, Wänden und Decken - Anforderungen und Prüfverfahren This European Standard was approved by CEN on 5 February 2013 and includes Amendment 1 approved by CEN on 24 November 2014.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, 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 © 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 16153:2013+A1:2015 ESIST EN 16153:2013+A1:2015
EN 16153:2013+A1:2015 (E) 2 Contents Page Foreword .4 Introduction .5 1 Scope .6 2 Normative references .6 3 Terms, definitions and symbols .7 3.1 Terms and definitions .7 3.2 Symbols . 11 4 Requirements . 12 4.1 Visual appearance . 12 4.2 Dimensions and mass per unit area and their tolerances . 13 4.3 Spectral characteristics . 14 4.4 Total solar energy transmittance . 15 4.5 Impact resistance. 15 4.6 Durability . 16 4.7 Deformation behaviour . 17 4.8 Airborne sound insulation . 17 4.9 Thermal transmittance . 18 4.10 Water vapour permeability . 18 4.11 Water/air tightness. 18 4.12 Linear thermal expansion . 18 4.13 Reaction to fire . 18 4.14 External fire performance . 18 4.15 Resistance to fire . 19 4.16 Net heat of combustion . 19 4.17 Presence of functional layers . 19 4.18 Dangerous substances . 19 4.19 Resistance to fixings . 19 4.20 Temporary protective coverings . 19 5 Test and calculation methods . 20 5.1 Dimensional tolerances and mass per unit area . 20 5.2 Total solar energy transmittance . 25 5.3 Test method of exposure to artificial ageing . 29 5.4 Yellowness index . 29 5.5 Small hard body impact resistance . 30 5.6 Deformation behaviour . 31 5.7 Airborne sound insulation . 42 5.8 Reaction to fire . 43 6 Assessment and verification of constancy of performance – AVCP . 48 6.1 General . 48 6.2 Product type determination . 48 6.3 Factory production control (FPC) . 50 6.4 Initial inspection of factory and of FPC . 52 6.5 Continuous surveillance of FPC . 53 7 Marking and labelling . 53 Annex A (normative)
Magnification and reduction factors . 55 A.1 General . 55 SIST EN 16153:2013+A1:2015
EN 16153:2013+A1:2015 (E) 3 A.2 Load duration . 55 A.3 Ageing and environmental influences . 55 A.4 Influence of temperature . 55 A.5 Conversion factors . 56 A.6 Marginal deformation . 56 !Annex ZA (informative)
Clauses of this European Standard addressing the provisions of the EU Construction Products Regulation . 57 ZA.1 Scope and relevant characteristics . 57 ZA.2 Procedure for AVCP of light transmitting flat multiwall polycarbonate sheets . 59 ZA.2.1 Systems of AVCP . 59 ZA.2.2 Declaration of performance (DoP) . 62 ZA.2.2.1 General . 62 ZA.2.2.2 Content. 63 ZA.2.2.3 Example of DoP . 64 ZA.3 CE marking and labelling. 66" Bibliography . 69
SIST EN 16153:2013+A1:2015
EN 16153:2013+A1:2015 (E) 4 Foreword This document (EN 16153:2013+A1:2015) has been prepared by Technical Committee CEN/TC 128 “Roof covering products for discontinous laying and products for wall cladding”, the secretariat of which is held by NBN. 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 September 2015, and conflicting national standards shall be withdrawn at the latest by December 2016. 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 document includes Amendment 1, approved by CEN on 2014-11-24. This document supersedes EN 16153:2013. The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ". !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 the EU Construction Products Regulation 305/2011. For relationship with the EU Regulation 305/2011, see informative Annex ZA, which is an integral part of this document." According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, 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. SIST EN 16153:2013+A1:2015
EN 16153:2013+A1:2015 (E) 5 Introduction This document describes the requirements for light transmitting flat multiwall PC sheets for internal and external use in walls, roofs and ceilings. It is applicable to the sheets for the delivery only. Reference should be made to national regulations and manufacturer's literature for requirements concerning the design, storage and fundamental guidance for installation of sheets, including all safety aspects. The standards and guideline addressing light transmitting flat multiwall PC sheets for building applications are the following: — EN 1873, Prefabricated accessories for roofing — Individual roof lights of plastics — Product specification and test methods (harmonised standard) — EN 14963, Roof coverings — Continuous rooflights of plastics with or without upstands — Classification, requirements and test methods (harmonised standard) — EOTA ETA-Guideline 010, Self supporting translucent roof kits The multiwall PC sheets that satisfy the requirements of this document are suitable for use as components in accordance with EN 1873, EN 14963 or EOTA ETA-Guideline 010. SIST EN 16153:2013+A1:2015
EN 16153:2013+A1:2015 (E) 6 1 Scope This European Standard specifies the requirements for light transmitting flat multiwall polycarbonate (PC) sheets for internal and external use in walls, roofs and ceilings. This European Standard applies to light transmitting flat extruded multiwall PC sheets with or without functional layers (e.g. coating, co-extruded layer) made from PC-based or other materials, without filling materials. It also specifies the test methods needed for the evaluation of conformity and marking of the sheets. 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 410:2011, Glass in building — Determination of luminous and solar characteristics of glazing EN 673, Glass in building — Determination of thermal transmittance (U value) — Calculation method EN 674, Glass in building — Determination of thermal transmittance (U value) — Guarded hot plate method EN 1990:2002, Eurocode — Basis of structural design EN 1873:2005, Prefabricated accessories for roofing — Individual roof lights of plastics — Product specification and test methods EN 1995-1-1, Eurocode 5: Design of timber structures — Part 1-1: General — Common rules and rules for buildings 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 13501-5, Fire classification of construction products and building elements — Part 5: Classification using data from external fire exposure to roofs tests EN 13823, Reaction to fire tests for building products — Building products excluding floorings exposed to the thermal attack by a single burning item EN 14500:2008, Blinds and shutters — Thermal and visual comfort — Test and calculation methods EN 14963:2006, Roof coverings — Continuous rooflights of plastics with or without upstands — Classification, requirements and test methods EN ISO 178, Plastics — Determination of flexural properties (ISO 178) EN ISO 291, Plastics — Standard atmospheres for conditioning and testing (ISO 291) EN ISO 472:2013, Plastics — Vocabulary (ISO 472:2013) EN ISO 717-1, Acoustics — Rating of sound insulation in buildings and of building elements — Part 1: Airborne sound insulation (ISO 717-1) SIST EN 16153:2013+A1:2015
EN 16153:2013+A1:2015 (E) 7 EN ISO 899-2, Plastics — Determination of creep behaviour — Part 2: Flexural creep by three-point loading (ISO 899-2) EN ISO 1043-1:2011, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special characteristics (ISO 1043-1:2011) EN ISO 1716, Reaction to fire tests for products — Determination of the gross heat of combustion (calorific value) (ISO 1716) EN ISO 4892-2:2006, Plastics — Methods of exposure to laboratory light sources — Part 2: Xenon-arc lamps (ISO 4892-2:2006) EN ISO 6603-1, Plastics — Determination of puncture impact behaviour of rigid plastics — Part 1: Non-instrumented impact testing (ISO 6603-1) EN ISO 10077-2, Thermal performance of windows, doors and shutters — Calculation of thermal transmittance — Part 2: Numerical method for frames (ISO 10077-2) EN ISO 10140-1:2010, Acoustics — Laboratory measurement of sound insulation of building elements — Part 1: Application rules for specific products (ISO 10140-1:2010) EN ISO 10140-2, Acoustics — Laboratory measurement of sound insulation of building elements — Part 2: Measurement of airborne sound insulation (ISO 10140-2) EN ISO 10140-4, Acoustics — Laboratory measurement of sound insulation of building elements — Part 4: Measurement procedures and requirements (ISO 10140-4) EN ISO 10140-5, Acoustics — Laboratory measurement of sound insulation of building elements — Part 5: Requirements for test facilities and equipment (ISO 10140-5) EN ISO 11664-1, Colorimetry — Part 1: CIE standard colorimetric observers (ISO 11664-1) EN ISO 11664-2, Colorimetry — Part 2: CIE standard illuminants (ISO 11664-2) EN ISO 11925-2, Reaction to fire tests — Ignitability of products subjected to direct impingement of flame — Part 2: Single-flame source test (ISO 11925-2) EN ISO 12572, Hygrothermal performance of building materials and products — Determination of water vapour transmission properties (ISO 12572) ISO 11359-2, Plastics — Thermomechanical analysis (TMA) — Part 2: Determination of coefficient of linear thermal expansion and glass transition temperature EOTA ETA-Guideline 010, Self Supporting Translucent roof Kits 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 472:2013, EN ISO 1043-1:2011 and the following apply. 3.1.1 PC sheet extruded sheet substantially made of polycarbonate polymer to which are added those additives to facilitate the manufacture of sheet conforming to the requirements of this standard and customer requirements SIST EN 16153:2013+A1:2015
EN 16153:2013+A1:2015 (E) 8 Note 1 to entry: Additives can be e.g. lubricants, processing aids, UV absorbers, colorants, functional layers or flame retardants. Note 2 to entry: There is a distinction between a coloured sheet containing colorants and an uncoloured sheet having a coloured functional layer or paint on the external surfaces. 3.1.2 multiwall PC sheet flat PC sheet with two parallel outside walls, internal parallel or non-parallel walls generally connected by vertical or non-vertical ribs or other internal features 3.1.3 multiwall PC sheet with symmetrical in-plane cross-section multiwall PC sheet having, perpendicularly to the extrusion direction, symmetrical geometrical shape and material distribution relatively to a median plane Note 1 to entry: Examples of typical sheets with symmetrical in-plane cross-section are given in Figure 1.
a) b)
c) Figure 1 — Typical sheets with symmetrical in-plane cross-section 3.1.4 multiwall PC sheet with symmetrical in-plane mirror multiwall PC sheet having perpendicularly to the extrusion direction, symmetrical geometrical shape and material distribution relatively to a plane-mirror located parallel to one of both outer surfaces and lateral movement Note 1 to entry: An example of typical sheets with symmetrical in-plane mirror is given in Figure 2. SIST EN 16153:2013+A1:2015
EN 16153:2013+A1:2015 (E) 9
Figure 2 — Typical sheet with symmetrical in-plane mirror 3.1.5 multiwall PC sheet with unsymmetrical geometry multiwall PC sheet which does not comply with the definitions given in 3.1.3 and 3.1.4 Note 1 to entry: Examples of typical sheets with unsymmetrical geometry are given in Figure 3.
a)
b) Figure 3 — Typical sheets with unsymmetrical geometry 3.1.6 indirect test IT test performed by the manufacturer, different from that specified for that particular characteristic, having verified its correlation with the specified test 3.1.7 sheet length dimension of a sheet in the extrusion direction, parallel to the cells Note 1 to entry: It is expressed in millimetres (mm). SIST EN 16153:2013+A1:2015
EN 16153:2013+A1:2015 (E) 10 3.1.8 sheet width Ws dimension of a sheet perpendicular to the extrusion direction Note 1 to entry: It is expressed in millimetres (mm). 3.1.9 x-direction extrusion direction corresponding to the length of a sheet 3.1.10 y-direction direction perpendicular to the x-direction of a sheet in the sheet plane 3.1.11 overall sheet thickness h total thickness of a sheet Note 1 to entry: It is expressed in millimetres (mm). 3.1.12 width b width of a test specimen in x-direction testing or length of a test specimen in y-direction testing Note 1 to entry: It is expressed in millimetres (mm). Note 2 to entry: For the purposes of bending tests in 5.6. 3.1.13 span L initial distance between lines of contact between the test specimen and the test specimen supports Note 1 to entry: It is expressed in millimetres (mm). Note 2 to entry: For the purposes of bending tests in 5.6.3 and 5.6.4. 3.1.14 cross-head span Lc distance between the cross-head loading points Note 1 to entry: It is expressed in millimetres (mm). Note 2 to entry: For the purposes of the four-point bending test in 5.6.4.2. 3.1.15 cell size wc dimension of the smallest geometric unit of a sheet, perpendicular to the extrusion direction, which is repeated across the sheet structure Note 1 to entry: It is expressed in millimetres (mm). Note 2 to entry: Examples of typical cells geometry are given in Figure 4. SIST EN 16153:2013+A1:2015
EN 16153:2013+A1:2015 (E) 11
Figure 4 — Typical cell geometry 3.2 Symbols For the purposes of this document, the symbols and the relevant subclauses are given in Table 1. Table 1 — Symbols Symbols Term/definition Relevant subclause a1 Out of squareness of a sheet 5.1.11 a2 Out of squareness of a sheet 5.1.11 b Either width of a test specimen in x-direction testing or length of a test specimen in y-direction testing 5.6.3 and 5.6.4 c Lateral curvature of a sheet 5.1.12 Bx Bending stiffness in x-direction 5.6.3 By Bending stiffness in y-direction 5.6.3 d1 Flatness across the sheet width 5.1.10 d2 Flatness across the sheet width 5.1.10 F Applied force 5.6.4 Fb Maximum applied force corresponding to buckling 5.6.4 Fx Applied force for test in x-direction 5.6.3 Fy Applied force for test in y-direction 5.6.3 g Total solar energy transmittance 4.4; 5.2 h Overall sheet thickness Whole document he External heat transfer coefficient 5.2.1 hi Internal heat transfer coefficient 5.2.1 L Span 5.6 Lc Cross-head span 5.6.4.2 Lsp Length of a test specimen 5.1 Lx Span for test in x-direction 5.6.3.3 Ly Span for test in y-direction 5.6.3.3 Mb Buckling moment 5.6.4 m Mass of a test specimen 5.1.5; 5.1.6 os Overhang 5.6.4.2; 5.6.4.3 SIST EN 16153:2013+A1:2015
EN 16153:2013+A1:2015 (E) 12 Symbols Term/definition Relevant subclause !Rw(C;Ctr)" Sound reduction index 4.8; 5.7 R1 Radius of the supports 5.6.4.2; 5.6.4.3 r Flexural strain rate 5.6.3; 5.6.4.2; 5.6.4.3 Sy Shear stiffness in y-direction 5.6.3.3 !sx" Deflection at mid-span 5.6.3.3 s Deflection 5.6.4.2 sy1 Deflection at mid-span Ly1 5.6.3.3 sy2 Deflection at mid-span Ly2 5.6.3.3 U Thermal transmittance 4.9 Ws Sheet width 5.1 Wsp Width of a test specimen 5.1 wc cell size 5.6.4.2; 5.6.4.3 YI Yellowness index 4.6, 5.4 . Linear thermal expansion 4.12 .e1 Solar direct absorptance of the outer face 5.2.1.3 .e2 Solar direct absorptance of the inner face 5.2.1.3 .pe Solar direct absorptance of one of both outside walls 5.2.1.3 / Water vapour permeability 4.10 ûY Variation of yellowness index 4.6, 5.4
Thermal conductance between two virtual walls 5.2.1 a Mass per unit area 5.1.5 d Mass per unit area of a test specimen 5.1.6 e Solar direct reflectance 5.2.1 pe Solar direct reflectance of one of both outside walls 5.2.1 2e Solar direct transmittance 4.3; 5.2.1 2e,n-h Normal-hemispherical solar transmittance (see 4.3, NOTE 1). 4.3 2pe Solar direct transmittance of one of both outside walls 4.3; 5.2.1 2v Light transmittance 4.3 2v,n-h Normal-hemispherical light transmittance (see 4.3, NOTE 1). 4.3 4 Requirements 4.1 Visual appearance The sheets shall have regular and smooth surfaces. There shall be no scratches, marks or other defects larger than 4 mm2 each anywhere on the sheet surface. SIST EN 16153:2013+A1:2015
EN 16153:2013+A1:2015 (E) 13 There shall be no obvious bubbles, inclusions, cracks, depressions or other defects anywhere in the sheet that could adversely affect the performance of the sheet in its intended application. The edges of the sheet shall be straight and cut cleanly. The colour distribution shall be visually uniform, unless otherwise specified. For specific uses, further requirements concerning the visual aspects of the sheets might be considered. 4.2 Dimensions and mass per unit area and their tolerances The dimensional tolerances and mass per unit area shall be assessed when subject to regulatory requirement. When tested in accordance with the test methods specified in 5.1.1 to 5.1.12, the dimensional tolerances and mass per unit area of the sheets shall conform to the requirements given in Table 2. The test methods given in Table 2 are used for initial type testing, and are the reference test methods. Any other indirect test method may be chosen provided that it is sufficiently accurate to ensure that the dimensions of the products meet the requirements of Table 2 and as far as a correlation is demonstrated with the concerned reference test method. SIST EN 16153:2013+A1:2015
EN 16153:2013+A1:2015 (E) 14 Table 2 — Requirements for dimensions and mass per unit area and their tolerances Characteristic Test method Requirement Overall sheet thickness 5.1.4 The nominal overall sheet thickness of the sheet shall be declared in millimetres. The overall sheet thickness at any point shall not vary by more than ± 0,5 mm of this value. Mass per unit area 5.1.5 The nominal mass per unit area of the sheet shall be declared in grams per square metre. The mass per unit area of a sheet shall be not less than 95 % of the declared nominal mass per unit area. Variation of mass per unit area 5.1.6 The mass per unit area of each cut section across the width of the sheet shall not vary by more than ± 6 % from the calculated mean mass per unit area of the cut sections. Sheet length 5.1.7 The sheet length shall be within the interval from: - 0 mm to +12 mm of the declared sheet length for sheet length up to 3 000 mm; - 0 % to +0,40 % of the declared sheet length for sheet length greater than 3 000 mm. Sheet width 5.1.7 The sheet width shall be within the interval from – 2 mm to + 6 mm of the declared sheet width. Deviation from rectangular shape (only for rectangular sheets) 5.1.8 The difference between the lengths of the two diagonals of the sheet shall be less than 0,5 % of the width of the sheet. Wall and internal feature thickness 5.1.9 When required, the nominal wall and internal feature thicknesses and the tolerances shall be declared. Sheet flatness 5.1.10 The deviation from flat across the width of the sheet shall be ≤ 5 mm per meter of width. The deviation from flat along the length of the sheet shall be ≤ 5 mm/linear metre. Out of square 5.1.11 The deviation of squareness of the sheet shall be < 5 mm per meter of width. Lateral curvature 5.1.12 The maximum distance between the straight edge and the side(s) of the sheet shall be < 5 mm/m. 4.3 Spectral character
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