EN 1748-1-2:2004

Glass in building - Special basic products - Borosilicate glasses - Part 1-2: Evaluation of conformity/Product standard

This document covers the evaluation of conformity and the factory production control of borosilicate glass products for use in buildings.
Note: For glass products with electrical wiring or connections for, e.g. alarm or heating purposes, other directives, e.g. Low Voltage Directive, may apply.

Glas im Bauwesen - Spezielle Basiserzeugnisse - Borosilicatgläser - Teil 1-2: Konformitätsbewertung/Produktnorm

Diese Europäische Norm umfasst die Konformitätsbewertung und die werkseigene Produktionskontrolle von Produkten aus Borosilicatglas zur Anwendung im Bauwesen.
ANMERKUNG   Für Glaserzeugnisse mit elektrischer Verkabelung oder Anschlüssen, wie z. B. Alarm- oder Heizungsanwendungen, können andere Richtlinien, z.B. die Niedrigspannungsrichtlinie, gelten.

Verre dans la construction - Produits de base spéciaux - Partie 1-2: Verres borosilicatés - Evaluation de la conformité/Norme de produit

Domaine d'application
La présente partie de la Norme européenne couvre l'évaluation de la conformité et les dispositions du contrôle de la production en usine pour les produits verriers borosilicatés de base.
Pour les produits verriers équipés d'un câblage ou de branchements électriques pour les besoins d'alarme ou de chauffage par exemple, la présente norme couvre uniquement les éléments de câblage prévus pour une différence de potentiel électrique à la terre inférieure à 50 V c.a. ou inférieure à 75 V c.c.

Steklo v stavbah - Posebni osnovni izdelki - Borosilikatno steklo - 1-2. del: Ovrednotenje skladnosti/standard za izdelek

General Information

• Status: Published
• Publication Date: 05-Oct-2004
• Withdrawal Date: 30-Jul-2006
• ICS: 81.040.20 - Glass in building
• Technical Committee: CEN/TC 129 - Glass in building
• Drafting Committee: CEN/TC 129/WG 1 - Basic glass products
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 06-Oct-2004
• Completion Date: 06-Oct-2004
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive: 89/106/EEC - Construction products
• Mandate: M/135 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on flat glass, profiled glass and glass block products
• Ref Project: SIST EN 1748-1-2:2005 - Glass in building - Special basic products - Borosilicate glasses - Part 1-2: Evaluation of conformity/Product standard

Relations

• Revised: prEN 1748-1-2 - Glass in building - Special basic products - Borosilicate float glass - Part 1-2: Product standard
• Effective Date: 18-Jan-2023

Overview

EN 1748-1-2:2004 - Glass in building: Special basic products - Borosilicate glasses - Part 1‑2: Evaluation of conformity/Product standard is a CEN product standard that defines the procedures for evaluation of conformity and factory production control (FPC) of borosilicate glass products intended for use in buildings. It complements EN 1748‑1‑1 (definition and physical/mechanical properties) and supports CE marking and compliance with EU construction product requirements (see Annex ZA).

Key topics and requirements

• Scope and purpose: Establishes how manufacturers demonstrate that borosilicate glass products meet the defined characteristics and durability expectations for building use.
• Initial type testing (ITT): Procedures for determining product performance and durability using tests, standard calculations, accepted values or test reports.
• Factory production control (FPC): Requirements for factory organization, process control, inspection, testing tables and record keeping to ensure ongoing conformity.
• Performance characteristics: Covers optical, thermal and mechanical properties, including:
  • Light and solar transmittance, reflectance (EN 410)
  • Thermal transmittance (U‑value) calculation (EN 673)
  • Mechanical resistance, temperature shock resistance and bending strength (reference to EN 1748‑1‑1)
  • Sound insulation (EN 12758)
  • Fire classification (reaction to fire EN 13501‑1; resistance to fire EN 13501‑2)
  • Safety glazing behaviours such as pendulum impact (EN 12600), burglar resistance (EN 356), bullet resistance (EN 1063) and explosion resistance (EN 13541)
• Durability and documentation: Performance must be maintained for an economically reasonable working life; manufacturers must supply installation and maintenance instructions and document product descriptions and test reports.
• Marking and CE: Specifies product marking, labelling and the content needed for declarations of conformity; Annex ZA links clauses to the EU Construction Products Directive and CE marking procedures.
• Other considerations: Notes that additional directives (e.g., Low Voltage Directive) may apply when products include electrical wiring or connections.

Applications and users

Who uses EN 1748‑1‑2:2004:

• Glass manufacturers producing borosilicate panes and units for building applications
• Quality and conformity assessment bodies performing ITT, FPC audits and certification
• Architects, façade engineers and specifiers requiring verified product performance (thermal, acoustic, safety, fire)
• Contractors and façade installers referencing durability and installation instructions
• Regulators and procurement teams assessing compliance for construction projects

Practical uses:

• Demonstrating compliance for CE marking and for tendering/approval
• Establishing factory control procedures and test schedules
• Verifying that borosilicate glazing meets thermal, acoustic, mechanical and safety requirements for building envelopes and special installations

Related standards (selected)

• EN 1748‑1‑1 (definition and properties)
• EN 410, EN 673, EN 12600, EN 12758
• EN 1063, EN 356, EN 13541
• EN 13501‑1 / EN 13501‑2 (fire classification)
• prEN 13474, prEN 13501‑5

Keywords: EN 1748-1-2:2004, borosilicate glass, conformity assessment, factory production control, CE marking, glass in building, thermal transmittance, safety glazing, fire classification.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Glass in building - Special basic products - Borosilicate glasses - Part 1-2: Evaluation of conformity/Product standardSteklo v stavbah - Posebni osnovni izdelki - Borosilikatno steklo - 1-2. del: Ovrednotenje skladnosti/standard za izdelekVerre dans la construction - Produits de base spéciaux - Partie 1-2: Verres borosilicatés - Evaluation de la conformité/Norme de produitGlas im Bauwesen - Spezielle Basiserzeugnisse -
Borosilicatgläser - Teil 1-2: Konformitätsbewertung/Produktnorm81.040.20Steklo v gradbeništvuGlass in buildingICS:SIST EN 1748-1-2:2005enTa slovenski standard je istoveten z:EN 1748-1-2:200401-marec-2005SIST EN 1748-1-2:2005SLOVENSKI
STANDARDSIST EN 1748-2:19991DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1748-1-2October 2004ICS 81.040.20 English versionGlass in building - Special basic products - Borosilicate glasses -Part 1-2: Evaluation of conformity/Product standardVerre dans la construction - Produits de base spéciaux - Verres borosilicatés - Partie 1-2: Evaluation de laconformité/Norme de produitGlas im Bauwesen - Spezielle Basiserzeugnisse - Borosilicatgläser - Teil 1-2:Konformitätsbewertung/ProduktnormThis European Standard was approved by CEN on 27 May 2004.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 1748-1-2:2004: E

Factory production control.15 A.1 Factory Production Control Requirements.15 A.1.1 General.15 A.1.2 Organisation.15 A.1.3 Control system.15 A.2 Marking.16 A.3 Inspection and testing tables of borosilicate glass products production.17 A.3.1 Information on Tables A.1 to A.3.17 A.3.2 Use of proxy testing.17 Annex°B (informative)
Provisions for voluntary involvement of third party(ies).21 B.1 General.21 B.2 Voluntary tasks for third parties.21 B.3 Marking and labelling.21

Clauses of this European Standard addressing the provisions of EU Construction Products Directive.22 ZA.1 Scope and relevant characteristics.22 ZA.2 Procedure(s) for the attestation of conformity of borosilicate glass products.24 ZA.2.1 System(s) of attestation of conformity.24 ZA.2.2 EC Certificate and Declaration of conformity.27 ZA.3 CE marking and labelling.29 Bibliography.32

Note: For glass products with electrical wiring or connections for, e.g. alarm or heating purposes, other directives, e.g. Low Voltage Directive, may apply.
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 356, Glass in building - Security glazing - Testing and classification of resistance against manual attack EN 410, 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 1063, Glass in building - Security glazing - Testing and classification of resistance against bullet attack ENV 1187, Test methods for external fire exposure to roofs EN 1748–1-1, Glass in building - Special basic products -Borosilicate glasses - Part 1-1: Definition and general physical and mechanical properties EN 12600, Glass in building - Pendulum test - Impact test method and classification for flat glass
EN 12758, Glass in building - Glazing and airborne sound insulation – Product descriptions and determination of properties
prEN 13474, Glass in building - Design of glass panes 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 resistance to fire tests, excluding ventilation services prEN 13501-5, Fire classification of construction products and building elements - Part 5: Classification using
data from fire exposure roof tests EN 13541, Glass in building - Security glazing - Testing and classification of resistance against explosion pressure

3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1748-1-1 and the following apply. 3.1 initial type testing determination of the performance of a product (characteristic, durability), on the basis of either actual tests or other procedures (such as conventional, standardised, tabulated or general accepted values, standardised or recognised calculation methods, test reports when made available,), in accordance with this document that demonstrates compliance with this document.
3.2 test report document that covers the results of tests undertaken on a representative sample of the product from production or on a prototype design of the product.
3.3 product description document that details the relevant parameters, e.g. process conditions, structure, etc., for defining a product that complies with the standard. It includes specific reference(s) to characteristics that are modified by the production process. 3.4 significant change variation in performance beyond the permitted tolerance for the characteristic. 4 Requirements 4.1 Conformity with the definition of borosilicate glass products Products shall conform to the definition and fulfil the requirements of borosilicate glass products as defined in EN 1748 1-1. 4.2 Determination of the characteristic’s performances 4.2.1 Characteristics of borosilicate glasses Borosilicate glass products are made in accordance with EN 1748-1-1. The characteristics listed in Table 1, concern generally accepted values, calculated values or measured values.

Characteristic
Symbol
Unit Generally accepted values: -
density - hardness - Young's modulus - Poisson's ratio - Characteristic bending strength - Resistance against sudden temperature changes and temperature
differentials
- Specific heat capacity - Coefficient of linear expansion - Thermal conductivity (for U-value) - Mean refractive index to visible radiation - Emissivity
ρ HK0,1/20 E µ fg,k
c α λ n ε
kg/m³ Gpa Pa Dimensionless Pa K
J/(kg.K) K-1 W/(m.K) Dimensionless Dimensionless
Measured values: - light transmittance - solar direct transmittance
τv τe
Dimensionless Dimensionless Calculated values: - total solar energy transmittance
G
Dimensionless
4.2.2 Characteristics of borosilicate glass products If the basic borosilicate glass manufacturer wishes to claim that any performance characteristic is independent of the production equipment used then the factory production control system shall be in accordance with this document including his specific process control conditions. 4.2.2.1 Safety in the case of fire - Resistance to fire Fire resistance shall be determined and classified in accordance with EN 13501-2. Note: EN 357 may be used as a classification reference specific to fire resistant glazed elements. 4.2.2.2 Safety in the case of fire - Reaction to fire Reaction to fire shall be determined and classified in accordance with EN 13501-1. Borosilicate glass products are products/materials that do not require to be tested for reaction to fire (e.g. Products/materials of Classes A1* according to Commission Decision 96/603/EC, as amended 2000/605/EC).

The manufactured or supplied thickness of borosilicate glass shall conform to the ordered thickness. 4.2.2.10 Protection against noise - Direct airborne sound reduction The sound reduction indexes shall be determined in accordance with EN 12758.
4.2.2.11 Energy conservation and heat retention - Thermal properties The thermal transmittance value (U-value) shall be determined by calculation in accordance with EN 673 with:  emissivity ε :using the value of the emissivity as given in EN 1748-1-1.  nominal thickness of the glass panes

The manufacturer shall supply specific installation instructions or make reference to appropriate technical specifications. Note 1: The durability of glass products depends on:
 building and construction movements due to various actions;  building and construction vibrations due to various actions;  deflection and racking of the glass support due to various actions;  glass support design (e.g. drainage of infiltrated water in the rebate, prevention of direct contact between glass support members and glass);  accuracy of glass support and glass support member dimensions;  quality of the assembling of glass support members up to a glass support;  quality of installation of the glass support into or onto the buildings or constructions;  glass support expansion due to adsorbed moisture from the air or other sources;  the quality of installation of the glass product into or onto its support. 4.4 Characteristics other than those listed in 4.2 Optical and visual characteristics shall comply with EN 1748-1-1 Dimensional tolerances: shall comply with EN 1748-1-1 4.5 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.

5 Evaluation of conformity 5.1 General Evaluation of conformity in accordance with this document shall be as a result of Factory Production Control and Initial Type Testing in accordance with this document. 1) Factory production control;
This shall include the following:
a) Inspection of samples taken at the factory in accordance with a prescribed test plan;
b) Initial inspection of the factory and of factory production control;
c) Continuous surveillance and assessment of the factory production control. 2) Initial type testing of the product; Note: There may be a need to involve a third party, with 1b, 1c, and/or 2, for the purpose of regulatory marking (see Annex ZA). 5.2 Initial type testing of the product (see 5.1, 2) 5.2.1 General All the product’s characteristics shall be initial type tested to verify they are in conformity with the requirements of this document. In addition, instead of performing any actual testing, initial type testing may make use of: – generally accepted and/or conventional and/or standardised values, in the Clause 2 referenced standards, or in publications that are referred to in these standards; – standardised calculation methods and recognised calculation methods in the Clause 2 referenced standards, or in publications that are referred to in these standards; – test report(s) on the basis of 5.2.1.2 when made available except for the characteristics listed in 5.2.2. – where components are used whose characteristics have already been determined, by the component manufacturer, on the basis of conformity with other product standards, these characteristics need not be reassessed providing they remain unchanged by the manufacturing process; – release of dangerous substances may be assessed indirectly by controlling the content of the substance concerned; – durability may be assessed indirectly by controlling the production processes according to this document; Note 1: Products CE marked in accordance with appropriate harmonised European specifications may be presumed to have the performances stated with the CE marking.
Note 2: There may be a need to involve a third party for the purpose of regulatory marking (see Annex ZA).

1 The terms ‘manufacturer’ and ‘producer’ are understood as being synonyms (see CPD working document NB-CPD/02/019-issued 24 April 2002 – page1)

Table 2: Product aspects to be checked if product belongs to group borosilicate glass
Nr
Product aspect 1 Chemical composition 2 Thickness 3 Light transmittance (distinction clear glass from tinted glass)
5.2.3 Initial type testing of characteristic’s performances
All characteristics in 4.2.2 shall be subject to initial type tests in accordance with Clause 5.2.1. 5.3 Factory production control and inspection of samples in accordance with a prescribed test plan (see 5.1, 1a and b) Factory production control means the permanent internal control of production exercised by the manufacturer
All elements, requirements and provisions adopted by the manufacturer shall be documented in a systematic manner in the form of written policies and procedures. This production control system documentation shall ensure a common understanding of quality assurance and enable the achievement of the required product characteristics and the effective operation of the production control system to be checked.
Factory production control shall be according to Annex A of this document. Note 1: A factory production control system similar to EN ISO 9001 made product specific to this document should also be deemed to satisfy the requirements of this Clause. Note 2: There may be a need to involve a third party for the purpose of regulatory marking (see Annex ZA). Annex A of this document also summarises the tests that shall be carried out by the manufacturer as part of the production control in the factory, and as further testing of samples taken at the factory in accordance with a prescribed test plan. 5.4 Initial inspection of factory and of factory production control (see 5.1, 1c) The initial inspection of the factory and of the factory production control shall cover the parameters listed in Table 3 in conjunction with Annex A.
Note: There may be a need to involve a third party for the purpose of regulatory marking (see Annex ZA).

Table 3: Characteristics of interest for the Factory Production Control
Nr
Characteristic
Interested parameter related to the characteristic
For details, refer to
A
Resistance to fire Reaction to fire External fire behaviour
- checking incoming materials - chemical composition - product control after manufacture - labelling outgoing product
Annex A
B
Release of dangerous substances
- checking incoming materials
Annex A
C
Bullet resistance Explosion resistance Burglar resistance Pendulum body impact resistance Resistance against sudden temperature changes and temperature differentials Wind, snow, permanent and imposed load resistance of the glass unit
- checking incoming materials - chemical composition - product control after manufacture - labelling outgoing product
Annex A
D
Direct airborne sound reduction Thermal properties Radiation properties: – light transmittance and reflection – solar energy characteristic
- checking incoming materials - chemical composition - product control after manufacture - labelling outgoing product
Annex A
5.5 Continuous surveillance and assessment of the factory production control (see 5.1, 1c) The continuous surveillance and assessment of the factory production control shall cover the parameters listed in Table 3 in conjunction with Annex A.
Note: There may be a need to involve a third party for the purpose of regulatory marking (see Annex ZA). The frequency of production surveillance shall be twice per year for new production facilities or for facilities that do not already have a factory production control system in accordance with this document.

When a major non-conformance is recorded, the inspection shall be repeated within two month. The frequency of production surveillance shall return to, or remain at twice a year. When the repeated inspection also results in a major non-conformance, then the production shall be subject within two months to a repeated initial inspection of the factory and of the factory production control together with a surveillance inspection. When this repeated initial inspection and surveillance inspection also results in a major non-conformance then the products are considered as no longer conforming to this document. 6 Marking and/or labelling 6.1 General All voluntary marking and/or labelling shall comply
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