SIST EN 1279-1:2004
(Main)Glass in Building - Insulating glass units - Part 1: Generalities, dimensional tolerances and rules for the system description
Glass in Building - Insulating glass units - Part 1: Generalities, dimensional tolerances and rules for the system description
This European Standard is the product standard for insulating glass units, which defines insulating glass units, and ensures by means of the evaluation of conformity to this standard that over time:
- energy savings are made because the U-value and solar factor do not change significantly;
- health is preserved because sound reduction and vision do not change significantly;
- safety is provided because mechanical resistance does not change significantly.
It covers characteristics that are of importance for trade. Marking conditions are included.
NOTE 1: For glass products with electrical wiring or connections for, e.g. alarm or heating purposes, other directives, e.g. Low Voltage Directive, may apply.
The main intended uses of the insulating glass units are installations in windows, doors, curtain walling, roofs and partitions where there exists protection against direct ultraviolet radiation at the edges.
NOTE 2: In cases where there is no protection against direct ultraviolet radiation at the edges, such as structural sealant glazing systems, additional European technical specifications should be followed.
Units that are intended for artistic purposes are excluded from this standard.
This Part of this European standard, which is inextricably bound up with the other Parts of the standard, covers the materials, the rules for the system description, the optical and visual quality and the dimensional tolerances for insulating glass units.
Glas im Bauwesen - Mehrscheiben-Isolierglas - Teil 1: Allgemeines, Maßtoleranzen und Vorschriften für die Systembeschreibung
Diese Europäische Norm ist die Produktnorm für Mehrscheiben-Isoliergläser, die Mehrscheiben-Isoliergläser definiert und mit Hilfe der Beurteilung der Übereinstimmung mit dieser Norm sicherstellt, dass:
3 Energieeinsparungen erzielt werden, weil der U-Wert und der Gesamtenergiedurchlassgrad sich nicht wesentlich verändern;
3 die Gesundheitsvorsorge gefördert wird, weil Schalldämmung und Durchsicht sich nicht wesentlich verändern;
3 der Sicherheit gedient wird, weil sich die mechanische Festigkeit nicht wesentlich verändert.
Diese Norm deckt Merkmale ab, die für den Handel von Bedeutung sind. Die Bedingungen für die Kennzeichnung sind inbegriffen.
ANMERKUNG 1 Für Glaserzeugnisse mit elektrischer Verdrahtung oder elektrischen Anschlüssen, für z. B. Alarm- oder Heizfunktionen können weitere Richtlinien, z. B. die Niederspannungsrichtlinie gelten.
Die Haupteinsatzbereiche der Mehrscheiben-Isoliergläser sind Fenster, Türen, Vorhangfassaden, Dachkonstruktionen und Trennwände, wobei die Ränder gegen die direkte Einwirkung von UV-Strahlung geschützt sind.
ANMERKUNG 2 Falls die Ränder nicht gegen direkte UV-Strahlung geschützt sind, wie z. B. bei "Structural Glazing"-Systemen, müssen zusätzliche Europäische technische Spezifikationen eingehalten werden.
Einheiten, die für künstlerische Zwecke vorgesehen sind, sind nicht Gegenstand dieser Norm.
Dieser Teil der Norm, der ausschließlich mit den anderen Teilen der Norm anzuwenden ist, umfasst die Materialien, die Regeln zur Systembeschreibung, die optische und die visuelle Qualität und die Maßtoleranzen für Mehrscheiben-Isoliergläser.
Verre dans la construction - Vitrage isolant préfabriqué scellé - Partie 1 : Généralités, tolérances dimensionnelles et regles de description du systeme
La présente norme européenne constitue la norme de produit applicable aux vitrages isolants préfabriqués scellés, définissant les vitrages isolants préfabriqués scellés, et assurant dans le temps au moyen de l'évaluation de la conformité a la présente norme :
des économies d'énergie car la valeur U et le coefficient solaire ne changent pas de maniere significative ;
une protection de la santé car l'affaiblissement acoustique et l'aspect visuel ne changent pas de maniere significative ;
la sécurité car la résistance mécanique ne change pas de maniere significative.
Elle couvre des caractéristiques d'importance pour le commerce. Les conditions de marquage sont incluses.
NOTE 1 Pour les produits verriers équipés d'un câblage ou de branchements électriques pour des besoins d'alarme ou de chauffage par exemple, d'autres directives, par exemple la directive basse tension, peuvent s'appliquer.
Les usages prévus des vitrages isolants préfabriqués scellés sont principalement les installations sur des fenetres, des portes, des facades-rideaux, des plafonds et des cloisons lorsque les bords sont protégés contre les rayonnements ultraviolets directs.
NOTE 2 En l'absence de protection contre les rayonnements ultraviolets directs sur les bords, comme pour des matériaux verriers de scellement structurel, il convient de se conformer a des spécifications techniques européennes supplémentaires.
Les vitrages destinés a une utilisation artistique sont exclus de la présente norme.
La présente partie de la norme, qui est liée de maniere indissociable aux autres parties de la norme, couvre les matériaux, les regles de description du systeme, la qualité optique et visuelle, les tolérances dimensionnelles et, dans une annexe informative, les recommandations d'installation.
Steklo v gradbeništvu – Izolacijsko steklo – 1. del: Splošno, dimenzijska odstopanja in pravila za opis sistema
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steklo v gradbeništvu – Izolacijsko steklo – 1. del: Splošno, dimenzijska odstopanja in pravila za opis sistemaGlas im Bauwesen - Mehrscheiben-Isolierglas - Teil 1: Allgemeines, Maßtoleranzen und Vorschriften für die SystembeschreibungVerre dans la construction - Vitrage isolant préfabriqué scellé - Partie 1 : Généralités, tolérances dimensionnelles et regles de description du systemeGlass in Building - Insulating glass units - Part 1: Generalities, dimensional tolerances and rules for the system description81.040.20Steklo v gradbeništvuGlass in buildingICS:Ta slovenski standard je istoveten z:EN 1279-1:2004SIST EN 1279-1:2004en01-september-2004SIST EN 1279-1:2004SLOVENSKI
STANDARD
SIST EN 1279-1:2004
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1279-1June 2004ICS 81.040.20English versionGlass in Building - Insulating glass units - Part 1: Generalities,dimensional tolerances and rules for the system descriptionVerre dans la construction - Vitrage isolant préfabriqué etscellé - Partie 1 : Généralités, tolérances dimensionnelleset règles de description du systèmeGlas im Bauwesen - Mehrscheiben-Isolierglas - Teil 1:Allgemeines, Maßtoleranzen und Vorschriften für dieSystembeschreibungThis European Standard was approved by CEN on 2 January 2003.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 Central Secretariat 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 Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1279-1:2004: ESIST EN 1279-1:2004
EN 1279-1:2004 (E) 2 Contents Foreword.3 1 Scope.4 2 Normative references.4 3 Definitions.5 4 Insulating glass unit systems.8 4.1 General.8 4.2 The glass panes/components.8 4.3 Cavity fillings.9 4.4 Cavity inserts.9 4.5 Shapes.9 4.6 Curved insulating glass units.9 5 Requirements.9 5.1 Conformity with the definition of insulating glass units.9 5.2 Optical and visual quality of the glazed unit.11 5.3 Dimensions and dimensional tolerances.12 5.3.1 General.12 5.3.2 Height and width of the unit.12 5.3.3 Thickness tolerances along the periphery of the unit.13 Annex A (normative)
System description of insulating glass units.15 A.1 General content of the system description.15 A.2 The normative part of the system description.15 A.2.1 Normative sub parts of the system description.15 A.2.2 The component descriptions.15 A.2.3 The processed edge seal description.16 A.3 The informative part of the system description.16 A.4 Test samples representative of the system description.16 Annex B (normative)
Tables of possibilities to substitute materials and components, and of possible changes within components.17 Annex C (informative)
Optical and visual quality of the glazed unit.23 C.1 Interference colouration (Brewster's fringes, Newton rings).23 C.1.1 Brewster’s fringes.23 C.1.2 Newton rings.23 C.1.3 Others.23 C.2 Glass deflection due to variations in temperature and barometric pressure.23 C.3 External condensation.23 C.4 Natural colour of clear glass.23
SIST EN 1279-1:2004
EN 1279-1:2004 (E) 3 Foreword
This document (EN 1279-1: 2004) has been prepared by Technical Committee CEN /TC 129, "Glass in building", the secretariat of which is held by IBN. 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 December 2004, and conflicting national standards shall be withdrawn at the latest by December 2004. 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(s). For relationship with EU Directive(s), see informative annex Z, which is an integral part of this document. This European Standard “Glass in Building - Insulating glass units” consists of the following Parts – Part 1: Generalities, dimensional tolerances and rules for the system description. – Part 2: Long term test method and requirements for moisture penetration. – Part 3: Long term test method and requirements for gas leakage rate and for gas concentration tolerances. – Part 4: Methods of test for the physical attributes of edge seals. – Part 5: Evaluation of Conformity. – Part 6: Factory production control and periodic tests. The annexes A and B are normative, and annex C is informative. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SIST EN 1279-1:2004
EN 1279-1:2004 (E) 4
1 Scope This European Standard is the product standard for insulating glass units, which defines insulating glass units, and ensures by means of the evaluation of conformity to this standard that over time: – energy savings are made because the U-value and solar factor do not change significantly; – health is preserved because sound reduction and vision do not change significantly; – safety is provided because mechanical resistance does not change significantly. It covers characteristics that are of importance for trade. Marking conditions are included. NOTE 1: For glass products with electrical wiring or connections for, e.g. alarm or heating purposes, other directives, e.g. Low Voltage Directive, may apply.
The main intended uses of the insulating glass units are installations in windows, doors, curtain walling, roofs and partitions where there exists protection against direct ultraviolet radiation at the edges. NOTE 2: In cases where there is no protection against direct ultraviolet radiation at the edges, such as structural sealant glazing systems, additional European technical specifications should be followed. Units that are intended for artistic purposes are excluded from this standard. This Part of this European standard, which is inextricably bound up with the other Parts of the standard, covers the materials, the rules for the system description, the optical and visual quality and the dimensional tolerances for insulating glass units. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated by amendment or revision. For undated references, the latest edition of the publication referred to applies. EN 572 Glass in Building - Basic soda lime silicate glass products -
Parts 1: Definitions and general physical and mechanical properties Part 2: Float glass Part 3: Polished wired glass Part 4: Drawn sheet glass Part 5: Patterned glass Part 6: Wired patterned glass l Part 8: Supplied and final cut sizes EN 1096-1 Glass in Building - Coated glass - Part 1: Definitions and classification SIST EN 1279-1:2004
EN 1279-1:2004 (E) 5 EN 1279-2 Glass in Building - Insulating glass units - Part 2: Long term test method and requirements for moisture penetration EN 1279-3 Glass in Building - Insulating glass units - Part 3: Long term test method and requirements for gas leakage rate and for gas concentration tolerances EN 1279-4 Glass in Building - Insulating glass units - Part 4: Methods of test for the physical attributes of edge seals EN 1279-6 Glass in Building - Insulating glass units - Part 6 Factory production control and periodic tests EN 1748-1-1 Glass in Building - Special Basic products - Part 1-1: Borosilicate glasses EN 1748-2-1 Glass in Building - Special Basic products - Part 2-1: Glass ceramics - Definition and description EN 1863-1 Glass in Building - Heat strengthened soda lime silicate glass - Part 1: Definition and description EN 12150-1 Glass in Building - Thermally toughened soda lime silicate safety glass - Part 1: Definition and description EN 12337-1 Glass in Building - Chemically strengthened soda lime silicate glass - Part 1: Definition and description EN ISO 12543 Glass in Building - Laminated glass and laminated safety glass
Part 1: Definition and description of component parts (ISO 12543-1:1998)
Part 2: Laminated safety glass (ISO 12543-2:1998)
Part 3: Laminated glass (ISO 12543-3:1998)
Part 6: Appearance (ISO 12543-6:1998) EN 13024-1 Glass in Building - Thermally toughened borosilicate safety glass - Part 1: Definition and description prEN 14178-1 Glass in Building - Basic alkaline earth silicate glass products - Part 1: Float glass prEN 14179-1 Glass in Building - Heat soaked thermally toughened soda lime silicate safety glass - Part 1: Definition and description prEN 14321-1 Glass in Building - Thermally toughened alkaline earth silicate safety glass - Part 1: Definition and description 3 Definitions For the purpose of this standard, the following definitions apply. 3.1 insulating glass unit (IGU) an assembly consisting of at least two panes of glass, separated by one or more spacers, hermetically sealed along the periphery, mechanically stable and durable (see 5.1). NOTE: systems are available where the spacer and hermetic seal are included within a single edge sealing system. SIST EN 1279-1:2004
EN 1279-1:2004 (E) 6 3.2 system a range of insulating glass units with a common edge seal profile, edge seal materials and edge seal components as described in the system description. The range having a similar edge seal performance, e.g. moisture penetration index, gas loss rate. 3.3 system description description of components and the edge seal of the insulating glass unit in terms relevant to identification, and in terms relevant to edge seal performance, e.g. moisture penetration index, gas loss rate. 3.4 permeation geometry the geometry of that part of the edge seal of the insulating glass unit through which the vapour and gas transmission takes place. For an example, see figure 1. NOTE: For TPS-type systems the permeation is through the body of the system rather than around the spacer and through the sealant.
Moisture penetration
Gas loss Figure 1 — Example of a permeation geometry 3.5 cavity (cavities) the gap(s) between the panes of an insulating glass unit. 3.6 channel a profile covering and protecting the edges and/or making it possible to install the unit in frames originally designed for single glass. 3.7 corner piece a joint piece that acts as a corner of the spacer frame. SIST EN 1279-1:2004
EN 1279-1:2004 (E) 7 3.8 dehydrated air or gas air or other gas with a low water vapour partial pressure which, when introduced into the cavity, eliminates the risk of condensation. 3.9 desiccant a product designed to lower the water vapour partial pressure inside the insulating glass unit. 3.10 desiccant cartridge a metal or plastic section, containing a desiccant, placed somewhere in the cavity. 3.11 edge seal the processed edge of an insulating glass unit, designed to ensure that moisture and gas transmissions between the inside and outside of the unit are limited, designed with a certain mechanical strength, and designed with a certain physical and chemical stability. 3.12 glass pane (also referred to as glass component) one sheet of glass. 3.13 inner sealant a sealant which, when applied, is in contact with the cavity of the insulating glass units.1 3.14 joint piece a piece that connects parts of a spacer. 3.15 outer sealant a sealant which, when applied, is in contact with the environment outside the insulating glass units2. 3.16 sealant organic material that, after application, has sufficient mechanical properties of cohesion and of adhesion to glass and/or spacer for use in edge seals. For the purpose of this standard, silicone sealant is considered to be organic. 3.17 spacer a component used to separate the panes and control the width of the gap at the edge of the unit. 3.18 external condensation condensation appearing on the glass panes of an insulating glass unit either on the room side surface or on the external surface. 3.19 internal condensation condensation appearing on the glass panes within the cavity of an insulating glass unit.
1 In the case of single seal insulating glass units, the inner sealant is the same as the outer sealant. 2 In the case of single seal insulating glass units, the outer sealant is the same as the inner sealant SIST EN 1279-1:2004
EN 1279-1:2004 (E) 8 3.20 absolute limit a value of a parameter, defined in the system description (annex A), which when exceeded requires: – remedial action in manufacturing, and – removal of products from production for repair or destruction. 3.21 action limit a value of a parameter, defined in the system description (annex A), which when exceeded requires: – remedial action in manufacturing. 4 Insulating glass unit systems 4.1 General The great number of possible different insulating glass units allows a distinction to be made between systems, based on common edge seal profiles, edge seal materials and other edge components. The possibility of substitution of different edge seal materials and other edge components are given in annex B table B.1and B2 and in EN 1279-4, and change of desiccant is given in annex B, table B.3. For conformity control purposes, the manufacturer shall describe his system in a system description, which will be a part of the factory production control documentation, or of the quality assurance system, whichever is applied. See also EN 1279-6. Disclosure of the system description is entirely at the discretion of the insulating glass unit manufacturer or his agent. The rules for the system description are given in annex A. It contains mainly a list of the applied edge seal materials and components, the nominal edge seal dimensions of the finished product, the action limits (see 3.21) and the absolute limits (see 3.20). Insulating glass unit systems can vary in the materials listed below, the limits in height, width, cavity width, glass thickness and number of cavities. These lists are not exhaustive. 4.2 The glass panes/components The glass pane(s)/component(s) shall be one of the following: a) basic glass products according to EN 572-1: float glass according to EN 572-2 polished wired glass according to EN 572-3 drawn sheet glass according to EN 572-4 patterned glass according to EN 572-5 wired patterned glass according to EN 572-6 b) special basic glass products: borosilicate glass according to EN 1748-1-1 glass ceramics according to EN 1748-2-1 alkaline earth silicate glass according to prEN 14178-1 SIST EN 1279-1:2004
EN 1279-1:2004 (E) 9 c) processed glasses: heat strengthened soda lime silicate glass according to EN 1863-1 thermally toughened soda lime silicate safety glass according to EN 12150-1 heat soaked thermally toughened soda lime silicate safety glass according to prEN 14179-1 chemically strengthened soda lime silicate glass according to EN 12337-1 thermally toughened borosilicate safety glass according to EN 13024-1 thermally toughened alkaline earth silicate safety glass according to prEN 14321-1 laminated glass and laminated safety glass according to EN ISO 12543 Parts 1, 2, 3 coated glass according to EN 1096-1 surface worked glass (e.g. sand blasted, acid etched) d) or other processed glasses, e.g. glass/plastic composites, consisting of one or more of the above basic or processed glasses and one or more layers of sheet plastics glazing material, e) or other glasses covered, or not, by European specifications. The glass panes, processed or unprocessed, may be: transparent, translucent or opaque clear or coloured 4.3 Cavity fillings The cavity between two panes may be filled with air and/or other gases. 4.4 Cavity inserts The cavity may contain inserts, such as a grid for aesthetic purposes, which shall meet the volatile content or the fogging test in EN 1279-6. 4.5 Shapes The panes may have any shape, e.g. rectangular, trapezium, triangular, circular, etc. 4.6 Curved insulating glass units Units with a bending radius greater than 1 metre comply with this standard without having to undergo the additional tests on curved test pieces. Units with a bending radius equal to or less than 1 metre comply with this standard if in addition curved test pieces with the same or smaller bending radius meet the moisture penetration requirements of EN 1279-2. The test specimens should be curved with the curving axis parallel with the longest side. 5 Requirements 5.1 Conformity with the definition of insulating glass units Products intended to belong to the insulating glass system shall conform to the definition of insulating glass units. Durability being ensured by the following: SIST EN 1279-1:2004
EN 1279-1:2004 (E) 10 the moisture penetration index, the I-value, being satisfied in accordance with EN 1279-2; the edge seal strength complying with EN 1279-4; the manufacturing process respecting
EN 1279-6; the recommendations of clause 4.4 and Annex B of prEN 1279-5 being followed; and in the case of gas-filled insulating glass units, the requirement of the gas leakage rate according to EN 1279-3 being satisfied Seal properties, validation methods and requirements are summarised in table 1 and table 2. Substitution of materials and of components shall maintain the conformity of the system with the definition of insulating glass units. The relevant seal properties and the related derived requirements are summarised in annex B, tables B1 and B2, together with the validation methods. When meeting the requirements, the substituting materials and components shall be added to the system description. Changes within components shall also comply with the above requirements. The requirements for the changes in the quantity of desiccant are given in annex B, table B3. When meeting the requirements, the change within the component shall be added to the system description. If glass panes are used which are not covered by European specifications, it shall be demonstrated that those glasses have a chemical and mechanical stability over time comparable with: soda lime silicate glass according to EN 572-1, or borosilicate glass according to EN 1748-1-1, or glass ceramics according to EN 1748-2-1, or alkaline earth silicate glass according to prEN 14178-1 Table 1 — Seal performance, validation method and requirements for IGUs
Applicable to:
Seal performance: Validation method: (Demonstration by means of available test report or by testing) Requirement:
All systems of IGU Moisture vapour penetration EN 1279-2 refer to EN 1279-2
Adhesion sealant-glassEN 1279-4 refer to EN 1279-4 NOTE: Tests can be carried out by different test laboratories
SIST EN 1279-1:2004
EN 1279-1:2004 (E) 11 Table 2 — Seal performance, supplementary validation methods and supplementary requirements for gas-filled insulating glass units and units with coated glass
Applicable to:
Seal performance: Validation method: (Demonstration by means of available test report or by testing)
Requirement: Gas-filled IGU: Type of gas Gas leakage rate EN 1279-3 refer to EN 1279-3 Gas filled units: Gas concentration
Subject of factory production control in accordance with EN 1279-6 refer to EN 1279-6, annex A.3 IGU incorporating
coated glass: Bonding to the coating Adhesion: - sealant/coating - interlayers of coating EN 1279-4, annex D refer to EN 1279-4 NOTE: Tests can be performed by different test laboratories
5.2 Optical and visual quality of the glazed unit Optical and visual quality requirements for single glazing are described in the appropriate European Standards: – EN 572 Parts 2 to 6 and 8 Glass in Building - Basic soda lime silicate glass products – EN 1096 -1 Glass in Building - Coated glass – EN 1748-1-1 Glass in Building - Special basic products - Borosilicate glass – EN 1748-2-1 Glass in Building - Special basic products - Glass ceramics – EN 1863 -1 Glass in Building - Heat strengthened soda lime silicate glass – EN 12150-1 Glass in Building - Thermally toughened soda lime silicate safety glass – EN 12337-1 Glass in Building - Chemically strengthened soda lime silicate glass – EN 12543-6 Glass in Building - Laminated glass and laminated safety glass – EN 13024-1 Glass in Building - Thermally toughened borosilicate safety glass – prEN 14178-1 Glass in Building - Basic alkaline earth silicate glass – prEN 14179-1 Glass in Building - Heat soaked thermally toughened soda lime silicate safety glass – prEN 14321-1 Glass in Building - Thermally toughened earth alkaline silicate safety glass NOTE 1: Visual and quality aspects of single panes are at such a level that the probability of exceeding the maximum allowable faults in the insulating glass unit may be considered as nil, so that no additional provisions have to be considered. Nevertheless a higher level of acceptance could be a subject of a quality contract between purchaser and insulating glass manufacturer, or could be according to the quality policy of the manufacturer. NOTE 2: In course of time, and due to unintended causes, the surfaces outside the insulating glass units can be weathered so that vision can be influenced. SIST EN 1279-1:2004
EN 1279-1:2004 (E) 12 For information on a number of optical and visual phenomena inherent in the product insulating glass unit and/or are due to physical behaviour, see annex C.
5.3 Dimensions and dimensional tolerances 5.3.1 General The following tolerances are based on the tolerances for single panes of glass given in the European standards listed in 4.2, and offer the worst-case situations. Narrowing these tolerances can be a subject of contractual agreement between the insulating glass unit manufacturer and his glass supplier and/or his customer, or be in common usage in a local market. Where narrower tolerances are adopted, they shall be quoted in the insulating glass unit system description and/or in the manufacturer's quality manual, or in specific cases, cross-referenced to the particular contract details. 5.3.2 Height and width of the unit When insulating glass unit dimensions are quoted for rectangular panes, the first dimension shall be the width, B, and the second dimension the height, H, as shown in figure 2. It shall be made clear which dimension is the width, B, and which is the height, H, when related to its installed position. For maximum and minimum sizes, the manufacturer should be consulted. NOTE 1: For insulating glass units containing patterned glass panes, the direction of the pattern should be specified relative to one of the dimensions. The insulating glass unit shall not be larger than a prescribed rectangle resulting from the given nominal dimensions, expressed in whole millimetres, increased by the permissible plus tolerance, or not smaller than a prescribed rectangle reduced by the permissible minus tolerance. The sides of the prescribed rectangles shall be parallel to one another and these rectangles shall have a common centre (see figure 3). The limits of the squareness shall also be prescribed by these rectangles. The dimensional tolerances will be subject to agreement between the insulating glass unit manufacturer and purchaser. The working tolerances shall be part of the system description and subject to the relevant clauses of EN 1279-6. NOTE 2: Limits on the exceeding of tolerances during manufacture are laid down in EN 1279-6.
Figure 2 — Examples of width and height relative to the pane shape SIST EN 1279-1:2004
EN 1279-1:2004 (E) 13
Figure 3 — Nominal height and width and tolerances. 5.3.3 Thickness tolerances along the periphery of the unit The actual thickness shall be measured between the outside glass surfaces of the unit, at each corner and at the approximate centre points of the edges. The values shall be measured to the nearest 0,1mm. The measured thicknesses shall not vary from the nominal thickness given by the manufacturer of the insulating glass units by more than the tolerances shown in table 3. The thickness tolerances of multi-cavity insulating glass units are obtained by using the following rules: a) determine the tolerance of each composition glass/cavity/glass in accordance with table 3; b) calculate the squares of those values; c) sum all those square values; d) calculate the square root of that sum. NOTE 1 Limits on the exceeding of tolerances during manufacture are laid down in EN 1279-6. NOTE 2 Narrowing the tolerances can be a subject for a quality contract between purchaser and insulating glass unit manufacturer, or can be a part of the quality policy of the insulating glass manufacturer, or can be in common usage in the local market.
SIST EN 1279-1:2004
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