Glass in building - Environmental product declaration - Product category rules for flat glass products

This document covers all life cycle stages, from cradle to grave, namely product stage, construction process stage, use stage and end-of-life stage of glass products (see Clause 4), used in buildings.
While covering all life cycle stages, this PCR primarily focuses on the product stage, in particular the manufacturing of flat glass and the consequent processing into flat glass products (as listed in point 4.), from cradle to gate. It covers raw materials and energy supply, transport, flat glass manufacturing, flat glass processing, packaging and storage.
All requirements and recommendations in this PCR for the elaboration of the Life Cycle Inventory may be applicable to flat glass used in other applications.
This PCR includes the rules to produce EPD that contains more than one thickness or configuration of the same product.

Glas im Bauwesen - Umweltproduktdeklaration - Produktkategorieregeln für Flachglasprodukte

Dieses Dokument deckt alle Lebenszyklusphasen, von der Wiege bis zur Bahre, ab, das heißt die Herstellungsphase, die Errichtungsphase, die Nutzungsphase und die Entsorgungsphase von Glaserzeugnissen (siehe Abschnitt 4), die in Gebäuden verwendet werden.
Obwohl sie alle Lebenszyklusphasen abdecken, konzentrieren sich die Produktkategorieregeln hauptsächlich auf die Herstellungsphase, insbesondere die Herstellung von Flachglas und die nachfolgende Verarbeitung zu Flachglaserzeugnissen (wie in Punkt 4 aufgeführt), von der Wiege bis zum Fabriktor. Es werden Ausgangsstoffe und Energiezufuhr, Transport, Flachglasherstellung, Flachglasverarbeitung, Verpackung und Lagerung abgedeckt.
Alle in diesen PCR festgelegten Anforderungen und Empfehlungen zur Ausarbeitung einer Sachbilanz dürfen auf Flachglas angewendet werden, das in anderen Anwendungen genutzt wird.
Diese PCR beinhalten die Regeln zur Erstellung einer EPD, die mehr als eine Stärke oder Konfiguration desselben Produkts enthält.

Verre dans la construction - Déclaration environnementale des produits - Règles régissant les catégories de produits en verre plat

Le présent document couvre l'ensemble des étapes du cycle de vie, depuis la production jusqu'à l'élimination finale, c'est-à-dire les étapes de production, de construction, d'utilisation et de fin de vie des produits verriers (voir Article 4) utilisés dans les bâtiments.
Bien que couvrant l'ensemble des étapes du cycle de vie, les présentes PCR portent essentiellement sur l'étape de production, et plus particulièrement la fabrication du verre plat et son traitement ultérieur au sein de produits en verre plat (voir Article 4), depuis la production jusqu'à l'élimination finale. Elles couvrent l'utilisation de matières premières et d'énergie, le transport, la fabrication du verre plat, le traitement du verre plat, ainsi que le conditionnement et le stockage.
Toutes les exigences et recommandations spécifiées dans les présentes PCR pour l'élaboration de l'inventaire du cycle de vie (ICV) peuvent s'appliquer au verre plat utilisé dans d'autres applications.
Les présentes PCR fournissent également les règles relatives à la production de EPD contenant plus d'une épaisseur ou configuration d'un même produit.

Steklo v gradbeništvu - Okoljske deklaracije za proizvode - Pravila za kategorije proizvodov iz ravnega stekla

Ta evropski standard zajema vse faze življenjskega cikla proizvodov iz stekla, in sicer od faze proizvoda, faze vgradnje, faze uporabe do faze odlaganja proizvodov iz stekla (glej točko 4), ki se uporabljajo v stavbah. Čeprav ta pravila za kategorije proizvodov zajemajo vse faze življenjskega cikla, se osredotočajo predvsem na fazo proizvoda, zlasti na proizvodnjo ravnega stekla in posledično predelavo v proizvode iz ravnega stekla (kot je navedeno v točki 4) »od zibelke do vrat«. Zajema oskrbo s surovinami in energijo, transport, proizvodnjo ravnega stekla, obdelavo ravnega stekla, pakiranje in skladiščenje. Vse zahteve in priporočila v teh pravilih za kategorije proizvodov za izdelavo seznama življenjskega cikla se lahko uporabljajo za ravno steklo pri drugih načinih uporabe, na primer za ravno steklo v avtomobilski industriji. Ta pravila za kategorije proizvodov vključujejo pravila za izdelavo okoljskih deklaracij na proizvodih z več kot eno debelino ali konfiguracijo istega izdelka.
Ta evropski standard se ne uporablja za steklene bloke, steklene tlakovce (EN 1051-1) in steklo v obliki kanala (EN 572-7, EN 15683-1).

General Information

Status
Published
Publication Date
22-Oct-2019
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
23-Oct-2019
Completion Date
23-Oct-2019

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SLOVENSKI STANDARD
SIST EN 17074:2020
01-februar-2020

Steklo v gradbeništvu - Okoljske deklaracije za proizvode - Pravila za kategorije

proizvodov iz ravnega stekla

Glass in building - Environmental product declaration - Product category rules for flat

glass products
Glas im Bauwesen - Umweltproduktdeklaration - Produktkategorieregeln für
Flachglaserzeugnisse
Verre dans la construction - Déclaration environnementale des produits - Règles
régissant les catégories de produits en verre plat
Ta slovenski standard je istoveten z: EN 17074:2019
ICS:
13.020.20 Okoljska ekonomija. Environmental economics.
Trajnostnost Sustainability
81.040.20 Steklo v gradbeništvu Glass in building
SIST EN 17074:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 17074:2020
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SIST EN 17074:2020
EN 17074
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 81.040.20
English Version
Glass in building - Environmental product declaration -
Product category rules for flat glass products

Verre dans la construction - Déclaration Glas im Bauwesen - Umweltproduktdeklaration -

environnementale des produits - Règles régissant les Produktkategorieregeln für Flachglasprodukte

catégories de produits en verre plat
This European Standard was approved by CEN on 2 September 2019.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17074:2019 E

worldwide for CEN national Members.
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EN 17074:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 3

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 7

4 Products covered/ Products category ..................................................................................................... 8

5 Comparability of EPDs ................................................................................................................................ 10

6 Date of publication ...................................................................................................................................... 10

7 PCR review ...................................................................................................................................................... 10

8 Expiration date .............................................................................................................................................. 10

9 Product category rules for LCA ............................................................................................................... 10

10 Content of the EPD ....................................................................................................................................... 19

Annex A (informative) Reference Service Life justification ....................................................................... 26

Annex B (informative) Glass manufacturing process................................................................................... 27

Annex C (informative) Method to calculate the potential environmental benefits of the use

of glass. ............................................................................................................................................................. 28

Annex D (informative) Recycling glass into new flat glass products (closed-loop recycling) ....... 29

Bibliography ................................................................................................................................................................. 31

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SIST EN 17074:2020
EN 17074:2019 (E)
European foreword

This document (EN 17074:2019) has been prepared by Technical Committee CEN/TC 129 “Glass in

building”, 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 April 2020, and conflicting national standards shall be

withdrawn at the latest by April 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

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, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
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Introduction

This document provides Product Specific Category Rules for flat glass products (Flat Glass PCR) used in

buildings and other construction works to support the assessment of the environmental performance

and the development of Environment Product Declarations.

This Flat Glass PCR aims at complementing the general rules established in EN 15804:2012+A1:2013,

by providing additional detailed rules on technical and environmental aspects of the manufacture of flat

glass products, as well as information on relevant aspects linked to use and end-of-life stages, on a

harmonized and scientific basis.

It specifies the requirements for the Life Cycle Assessment (LCA) study and the format and content of

the EPD itself.

In the Environment Product Declarations, the information is presented by way of a modular approach,

which allows for the easy organization and expression of data packages throughout the life cycle stages

of the product. The approach requires that the underlying data should be consistent, reproducible and

comparable.
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EN 17074:2019 (E)
1 Scope

This document covers all life cycle stages, from cradle to grave, namely product stage, construction

process stage, use stage and end-of-life stage of glass products (see Clause 4), used in buildings.

While covering all life cycle stages, this PCR primarily focuses on the product stage, in particular the

manufacturing of flat glass and the consequent processing into flat glass products (as listed in point 4.),

from cradle to gate. It covers raw materials and energy supply, transport, flat glass manufacturing, flat

glass processing, packaging and storage.

All requirements and recommendations in this PCR for the elaboration of the Life Cycle Inventory may

be applicable to flat glass used in other applications.

This PCR includes the rules to produce EPD that contains more than one thickness or configuration of

the same product.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 572-1:2012+A1:2016, Glass in building - Basic soda lime silicate glass products - Part 1: Definitions

and general physical and mechanical properties

EN 572-2, Glass in building - Basic soda lime silicate glass products - Part 2: Float glass

EN 572-3, Glass in building - Basic soda lime silicate glass products - Part 3: Polished wired glass

EN 572-4, Glass in building - Basic soda lime silicate glass products - Part 4: Drawn sheet glass

EN 572-5, Glass in building - Basic soda lime silicate glass products - Part 5: Patterned glass

EN 572-6, Glass in building - Basic soda lime silicate glass products - Part 6: Wired patterned glass

EN 572-7, Glass in building - Basic soda lime silicate glass products - Part 7: Wired or unwired channel

shaped glass

EN 1036-1, Glass in building - Mirrors from silver-coated float glass for internal use - Part 1: Definitions,

requirements and test methods

EN 1051-1, Glass in building - Glass blocks and glass pavers - Part 1: Definitions and description

EN 1096-1, Glass in building - Coated glass - Part 1: Definitions and classification

EN 1279-1, Glass in Building - Insulating glass units - Part 1: Generalities, system description, rules for

substitution, tolerances and visual quality

EN 1748-1-1, Glass in building - Special basic products -Borosilicate glasses - Part 1-1: Definition and

general physical and mechanical properties

EN 1748-2-1, Glass in building - Special basic products - Glass ceramics - Part 2-1 Definitions and general

physical and mechanical properties

EN 1863-1, Glass in building - Heat strengthened soda lime silicate glass - Part 1: Definition and

description
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EN 12150-1:2015+A1:2019, 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 13024-1, Glass in building - Thermally toughened borosilicate safety glass - Part 1: Definition and

description

EN 14178-1, Glass in building - Basic alkaline earth silicate glass products - Part 1: Float glass

EN 14179-1, Glass in building - Heat soaked thermally toughened soda lime silicate safety glass - Part 1:

Definition and description

EN 14321-1, Glass in building - Thermally toughened alkaline earth silicate safety glass - Part 1: Definition

and description

EN 15681-1, Glass in building - Basic alumino silicate glass products - Part 1: Definitions and general

physical and mechanical properties

EN 15682-1, Glass in building - Heat soaked thermally toughened alkaline earth silicate safety glass - Part

1: Definition and description

EN 15683-1, Glass in building - Thermally toughened soda lime silicate channel shaped safety glass - Part

1: Definition and description

EN 15755-1, Glass in building - Adhesive backed polymeric filmed glass - Part 1: Definitions and

requirements

EN 15804:2012+A1:2013, Sustainability of construction works - Environmental product declarations -

Core rules for the product category of construction products

EN 16477-1, Glass in building - Painted glass for internal use - Part 1: Requirements

EN ISO 12543-1, Glass in building - Laminated glass and laminated safety glass - Part 1: Definitions and

description of component parts (ISO 12543-1)

EN ISO 12543-2, Glass in building - Laminated glass and laminated safety glass - Part 2: Laminated safety

glass (ISO 12543-2)

EN ISO 12543-3, Glass in building - Laminated glass and laminated safety glass - Part 3: Laminated glass

(ISO 12543-3)

EN ISO 14025, Environmental labels and declarations - Type III environmental declarations - Principles

and procedures (ISO 14025)
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3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 15804:2012+A1:2013 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
by-product

substance or object, resulting from a production process, the primary aim of which is not the

production of that item, and which meets the following conditions:
(a) further use is certain;

(b) it can be used directly without any further processing other than normal industrial practice;

(c) it is produced as an integral part of a production process; and
(d) further use is lawful
[SOURCE: DIRECTIVE 2008/98/EC, Article 5]
3.2
end-of-waste status

certain specified waste ceases to be waste when it has undergone a recovery, including recycling,

operation and complies with specific criteria developed in accordance with the following conditions:

(a) it is commonly used for specific purposes;
(b) a market or demand exists;

(c) it fulfils the technical requirements for the specific purposes and meets the existing legislation and

standards applicable to products; and

(d) the use will not lead to overall adverse environmental or human health impacts

[SOURCE: DIRECTIVE 2008/98/EC, Article 6]

Note 1 to entry: Criteria for determining when glass cullet destined for the production of glass substances or

objects in re-melting processes ceases to be waste are established by the Commission Regulation No 1179/2012.

3.3
internal cullet

composed of defective products detected and rejected by a quality control process during the industrial

process of glass manufacturing, transition phases of product changes (such as thickness and/or colour

changes) and production offcuts

Note 1 to entry: These materials are immediately absorbed by the respective industrial process as a raw

material for a new melting operation, not leaving the glass manufacturing plant.
[SOURCE: JRC-IPTS Working document – EoW criteria for waste glass]
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3.4
external cullet
waste glass that is collected and/or reprocessed with the purpose of recycling

Note 1 to entry: External cullet can be of two types, pre-consumer, also called post-industrial glass cullet, and

post-consumer glass cullet.
[SOURCE: JRC-IPTS Working document – EoW criteria for waste glass].
3.5
pre-consumer cullet

waste glass resulting from the manufacturing of products that contain glass as one of their components,

and which leaves the specific facility where it was generated but not reaching the consumer market

Note 1 to entry: An example of pre-consumer cullet is the glass cullet constituted by off cuts of the production of

insulating glass which leave the processing facility and are re-melted in the flat glass manufacturing facility.

Note 2 to entry: Pre-consumer cullet if sorted properly fulfils the cullet specifications of the flat glass

manufacturers and can be directly sent back to the furnace without additional treatment.

[SOURCE: JRC-IPTS Working document – EoW criteria for waste glass]
3.6
post-consumer cullet

waste glass originated after the use of the glass products at the consumer market

[SOURCE:JRC-IPTS Working document – EoW criteria for waste glass]
3.7
similar product

product covered by this PCR produced by the same company using the same production process

4 Products covered/ Products category
4.1 General

Glass is used in a variety of construction applications to provide a transparent, impermeable barrier,

which may have additional insulating, solar control, security, noise reduction or decorative properties.

Glass is also used as a base component for other technologies such as photovoltaic cells, which may be

incorporated in construction works.

These Product Category Rules (PCR) are applicable to the production of flat glass products for use in

buildings such as:
a) basic glass products according to EN 572-1:2012+A1:2016:
• 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;
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• wired or unwired channel-shaped according to EN 572-7;
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 EN 14178-1;
• alumina silicate according to EN 15681-1;
• glass blocks and glass pavers according to EN 1051-1;
c) processed glasses:
• heat strengthened soda lime silicate glass according to EN 1863-1;

• thermally toughened soda lime silicate safety glass according to EN 12150-1:2015+A1:2019;

• heat soaked thermally toughened soda lime silicate safety glass according to EN 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 EN 14321-1;

• heat soaked thermally toughened alkaline earth silicate safety glass according to EN 15682-1;

• thermally toughened soda lime silicate channel shaped safety glass according to EN 15683-1;

• laminated glass and laminated safety glass according to EN ISO 12543-1, EN ISO 12543-2 and

EN ISO 12543-3;
• insulating glass unit according to EN 1279-1;
• coated glass according to EN 1096-1;
• mirror form silvered coated glass for interior use according to EN 1036-1;
• painted glass according to EN 16477-1;
• adhesive back polymeric filmed glass according to EN 15755-1;
• surface worked glass (e.g. sand blasted, acid etched);
• any combination of the above.

NOTE 1 The above list of products is not exhaustive. The PCR can also apply to other glass products not listed

above.

NOTE 2 These Product Category Rules are applicable to the whole glass product including all components, not

only the glass element. For example, they would include the sealant in an insulating glass unit.

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4.2 Inclusion of several products in the same EPD

Similar products can be presented in the same EPD but using different tables. A set of indicators and

technical information per product shall be included.
5 Comparability of EPDs

Comparison of EPDs of products used in buildings should consider the complete life cycle (cradle to

grave EPDs) as it should be based on the product’s use and its impacts on the building

(EN 15804:2012+A1:2013).

For comparison of EPDs of glass products used in buildings (comparisons at sub-building level), the

requirements of comparability set out in EN 15804:2012+A1:2013 and EN ISO 14025 shall be met.

Comparison of EPDs is not a simple and direct process. It requires the assurance of comparable

conditions and assumptions to avoid inaccurate conclusions. Functional requirements, as well as

technical and environmental characteristics and conditions must be the same.
6 Date of publication
Conditions of EN 15804:2012+A1:2013 apply.
7 PCR review
Conditions of EN 15804:2012+A1:2013 apply.
8 Expiration date
Conditions of EN 15804:2012+A1:2013 apply.
9 Product category rules for LCA
9.1 General

A Life Cycle Analysis (LCA) shall be performed, conforming to this PCR, in order to identify the

environmental impacts of each life cycle phase of the product.

The scope of the LCA shall include a description of the following according to this PCR:

• Functional unit;
• Reference Service Life;
• System boundaries;
• Criteria for the exclusion of inputs and outputs (cut-off rules);
• Selection of data and data quality requirements.
9.2 Functional unit

For each of the glass products listed in Clause 4, the functional unit is one square metre (1 m ) used as

glazing product and shall be complemented by one or several performance characteristics, such as

Transmittance, Reflectance, U-value, g-value, acoustics and safety classification according to European

standards.
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The reference flow shall be defined as regards the thickness and further configuration of the glass

products
9.3 Reference Service Life

As a reference, a service life of 30 years (see Annex A) shall be used, unless otherwise indicated in

product standard or specified by the manufacturer for specific in-use conditions.

9.4 System boundaries

The system boundaries define the unit processes that are included in the product system (see Figure 1).

The system boundaries of the EPD shall be described appropriately: cradle to gate, cradle to gate - with

options, cradle to grave], etc. It should be apparent as to what processes are considered in what

modules.

The system boundaries covered by these rules include all life cycle stages, i.e. product stage,

construction stage, use stage and end-of-life stage. The relevant modules included in each life cycle

stage are illustrated in Table 1. For cradle to gate, only modules A1 to A3 shall be mandatory, other

modules shall be used for other system boundaries (e.g. cradle to grave).
Table 1 — Life cycle stages and modules covered in the context of this PCR
Benefits
and loads
CONSTRUCTION END-OF-LIFE beyond
PRODUCT STAGE USE STAGE
STAGE STAGE the
system
boundary
A1/A'1 A2/A'2 A3/A'3 A4 A5 B1 B2 B3 B4 B5 B6 B7 C1 C2 C3 C4 D
M M M O O 0 O NA NA NA O NA O O O O O
M: mandatory, O: optional, NA: not applicable.

Module A3 of the product stage includes the manufacturing of flat glass and, in case it applies, the glass

processing into different transformed glass products.

In module A5 the ancillary elements to install the glass/ glass products in the building are not taken into

account because there are many different considerations related to the installation in the building

(depending on the type of building, frame materials, etc.). Thus, the ancillary elements will be

considered in the scenarios established under the Environmental Product Declaration of the window/

façade systems. Packaging waste shall be included in A'3 (see 9.8.1.4).
Raw Material supply
(extraction, processing, recycled
material)
Transport to manufacturer
Manufacture
Transport to building site
Installation in building
Use/ application
Maintenance
Repair
Replacement
Refurbishment
Operational energy use
Operational water use
Deconstruction/ demolition
Transport to end-of-life
Waste processing for reuse,
recovery or recycling
Disposal
Reuse, recovery or recycling
potential
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Flows related to human activities such as lighting, heating, cleaning of workshops, administration and

employee transport are excluded from the system boundaries.

The production of plants, machines and transportation systems inside the factories is also excluded

since the related flows are assumed to be negligible, compared to the production of glass products

when the comparison is done at the timescale of the reference service life of plants, machines or

transportation systems inside the factory.

EN 15804:2012+A1:2013 does not include any assessment of potential environmental benefits from the

product’s use in the building, (e.g. from energy savings due to a better insulation or solar gains in the

building when glass products are in use).

Since this standard does not provide the system boundaries nor the methodology for the calculation of

such benefits, they shall not be included in the calculations of the results presented in the EPD.

However, environment benefits from energy savings and losses in the use stage may be presented as

‘additional information’ in the EPD. When calculating the environmental benefits during the use phase

of glass products, the methodology applied shall be documented (see Annex C).
Figure 1 — System boundaries
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9.5 Criteria for the exclusion of inputs and outputs (cut-off rules)

In the life cycle assessment, all parameters from production data shall be included, i.e. all raw material

used per formulation, utilized thermal energy, internal fuel and electric power consumption, direct

production of waste and all available emission measurements.

According to EN 15804:2012+A1:2013, mass flows representing less than 1 % of the total mass input

and/or energy flows representing less than 1 % of the total primary energy usage of the associated unit

process may be omitted if data are not available. Cumulative omitted mass and energy usage shall not

exceed 5 % per module (i.e. per module A, B, C or D).

Substances of Very High Concern (SVHC) i.e. substances meeting the criteria in Article 57 and identified

in accordance with Article 59(1) of REACH Regulation (EC) N°1907/2006, in a concentration above

0.1 % by weight of the glass final product, shall be included in the Life Cycle Inventory and the cut-off

rules shall not apply.
9.6 Selection of data and data quality

Selection of data and data quality requirements shall follow rules specified in EN 15804:2012+A1:2013.

As a general rule, manufacturer’s average data or specific data as defined in EN 15804:2012+A1:2013,

derived from specific production processes, shall be the first choice as a basis for the LCA and EPD

calculations.

This type of data are required for at least the processes the producer of the glass products has influence

over (Table 2). In the case of this PCR, it means for flat glass manufacturing (module A3) and processing

(module A’3).
Table 2 — Application of generic and specific data
MODULE A1-A3 / A'1-A'3 A4 and A5 B1-B7 C1-C4
MODULES Production of
Product Installation End-of-life
commodities, Use processes
manufacture processes processes
raw materials
Processes the
Upstream manufacturer
Process type Downstream processes
processes has influence
over
Manufacturer’s
Data type Generic data average or Generic data
specific data

Generic data can be used in modules A1 and A’1 (production of raw materials for flat glass

manufacturing -A1- and glass processing – A’1). Materials origins, extraction and/ preparation

processes shall be properly and carefully selected from commercially available LCA databases and

ideally confirmed by raw materials suppliers. That is particularly important in the case of materials

with highest impacts in the results of the LCAs and environmental indicators.
9.7 Allocation of inputs and outputs (allocation rules)

Partitioning of the input or output flows from the processes in the production stage of the glass (A1-A3)

between the product system under study and any other product system should be avoided as far as

possible. If such partitioning cannot be avoided, (i.e. when the only practical option is allocation) then

this shall be done on a physical basis for A1 to A3 and be calculated for the respective reference unit of

kg.
---------------------- Page: 15 ----------------------
SIST EN 17074:2020
EN 17074:2019 (E)

For example, in case of a float line producing float glass from different thicknesses, if partitioning

cannot be avoided, input and output flows shall be allocated based on mass. However, the resulting

impacts shall be recomputed per square metre (m ) with a given thickness and density to align with the

functional unit.

If such partitioning of the input or output flows from the processes in the production stage of the glass

processing (A’1 to A’3) cannot be avoided then it shall be done on a physical basis for A’1 to A’3 and be

calculated for the respective reference unit of m .
9.8 Building Life Cycle Information
9.8.1 Product Stage (A1-A3 and A’1-A’3)
9.8.1.1 General

Modules A1-A3 cover the production stage. Modules A1-A3 correspond to the manufacture of flat glass

and modules A’1-A’3 to its further processing into flat glass products (see Figure 2). The information

from these three modules can be given independently (for each of the sub-modules A1, A2 and A3) or

aggregated (A1-A3).

The definition of Modules A1-A3 should be specified in the scope of the study. Fo

...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steklo v stavbah - Okoljske deklaracije za proizvode - Pravila za kategorije proizvodov iz ravnega steklaGlas im Bauwesen - Umweltproduktdeklaration - Produktkategorieregeln für FlachglaserzeugnisseVerre dans la construction - Déclaration environnementale des produits - Règles régissant les catégories de produits en verre platGlass in building - Environmental product declaration - Product category rules for flat glass products81.040.20Steklo v gradbeništvuGlass in building13.020.20Okoljska ekonomija. TrajnostnostEnvironmental economics. SustainabilityICS:Ta slovenski standard je istoveten z:prEN 17074oSIST prEN 17074:2017en,fr,de01-april-2017oSIST prEN 17074:2017SLOVENSKI

STANDARD
oSIST prEN 17074:2017
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
DRAFT prEN 17074
January
t r s y ICS
z sä r v rä t r English Version

Glass in building æ Environmental product declaration æ Product category rules for flat glass products

This draft European Standard is submitted to CEN members for enquiryä It has been drawn up by the Technical Committee

If this draft becomes a European Standardá CEN members are bounwhich stipulate the conditions for giving this European Standard the status of a national standard without any alterationä

This draft European Standard was established by CEN in three ofer language made by translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey andUnited Kingdomä

Recipients of this draft are invited to submitá with their commentsá notification of any relevant patent rights of which they are aware and to provide supporting documentationä

Warning ã This document is not a European Standardä It is distributed for review and commentsä It is subject to change without notice and shall not be referred to as a European Standardä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels

t r s y CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä prEN

s y r y vã t r s y EoSIST prEN 17074:2017
prEN 17074:2017
(E) 2 Contents Page

European foreword ....................................................................................................................................................... 3 Introduction .................................................................................................................................................................... 4 1 Scope .................................................................................................................................................................... 5 2 Normative references .................................................................................................................................... 5 3 Terms and definitions ................................................................................................................................... 7 4 Products covered/ Products category ..................................................................................................... 8 4.1 General ................................................................................................................................................................ 8 4.2 Inclusion of several products in the same EPD .................................................................................... 9 5 Comparability of EPDs ................................................................................................................................... 9 6 Date of publication ...................................................................................................................................... 10 7 PCR review ...................................................................................................................................................... 10 8 Expiration date .............................................................................................................................................. 10 9 Product category rules for LCA ............................................................................................................... 10 9.1 General ............................................................................................................................................................. 10 9.2 Functional unit .............................................................................................................................................. 10 9.3 Reference Service Life ................................................................................................................................ 10 9.4 System boundaries ...................................................................................................................................... 10 9.5 Criteria for the exclusion of inputs and outputs (cut-off rules) .................................................. 12 9.6 Selection of data and data quality .......................................................................................................... 12 9.7 Allocation of inputs and outputs (allocation rules) ......................................................................... 13 9.8 Building Life Cycle Information .............................................................................................................. 13 9.8.1 Product Stage (A1-A3 and A’1-A’3) ........................................................................................................ 13 9.8.2 Construction process stage (A4-A5) ...................................................................................................... 16 9.8.3 Use stage (B1-B7) ......................................................................................................................................... 16 9.8.4 End-of-life stage (C1-C4) ............................................................................................................................ 17 9.8.5 Transport (A2, A2’, A4, C2) ....................................................................................................................... 17 9.8.6 Supplementary information (Module D) ............................................................................................. 18 9.9 Life Cycle Impact Assessment .................................................................................................................. 18 10 Content of the EPD ....................................................................................................................................... 19 10.1 General information .................................................................................................................................... 19 10.2 Product information ................................................................................................................................... 19 10.3 Life Cycle Analysis data .............................................................................................................................. 19 10.4 Additional information .............................................................................................................................. 22 Annex A (informative)

Glass manufacturing process................................................................................... 23 Annex B (informative)

Method to calculate the potential environmental benefits of the use of glass. ............................................................................................................................................................. 24 Annex C (informative)

Module D - Benefits of recycling glass into new flat glass products (closed-loop recycling)............................................................................................................................... 25 Bibliography ................................................................................................................................................................. 27

oSIST prEN 17074:2017

prEN 17074:2017 (E) 3 European foreword This document (prEN 17074:2017) has been prepared by Technical Committee CEN/TC 129 “Glass in building”, the secretariat of which is held by NBN. This document is currently submitted to the CEN Enquiry. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. oSIST prEN 17074:2017

prEN 17074:2017

(E) 4 Introduction This document provides Product Specific Category Rules for flat glass products (Flat Glass PCR) used in buildings and other construction works to support the assessment of the environmental performance and the development of Environment Product Declarations. This Flat Glass PCR aims at complementing the general rules established in EN 15804, by providing additional detailed rules on technical and environmental aspects of the manufacture of flat glass products, as well as information on relevant aspects linked to use and end-of-life stages, on a harmonized and scientific basis. It specifies the requirements for the Life Cycle Assessment (LCA) study and the format and content of the EPD itself. In the Environment Product Declarations, the information is presented by way of a modular approach, which allow easy organization and expression of data packages throughout the life cycle stages of the product. The approach requires that the underlying data should be consistent, reproducible and comparable. oSIST prEN 17074:2017

prEN 17074:2017 (E) 5 1 Scope This European Standard covers all life cycle stages, from cradle to grave, namely product stage, construction process stage, use stage and end-of-life stage of glass products (see point 4), used in buildings. While covering all life cycle stages, this PCR primarily focuses on the product stage, in particular the manufacturing of flat glass and the consequent processing into flat glass products (as listed in point 4.), from cradle to gate. It covers raw materials and energy supply, transport, flat glass manufacturing, flat glass processing, packaging and storage. All requirements and recommendations in this PCR for the elaboration of the Life Cycle Inventory may be applicable to flat glass used in other applications, such as flat glass used in automotive. This PCR includes the rules to produce EPD that contains more than one thickness or configuration of the same product. This European Standard does not apply to glass blocks, glass paver units (EN 1051-1) and channel-shaped glass (EN 572-7, EN 15683-1). 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 572-1, Glass in building - Basic soda lime silicate glass products - Part 1: Definitions and general physical and mechanical properties EN 572-2, Glass in building - Basic soda lime silicate glass products - Part 2: Float glass EN 572-3, Glass in building - Basic soda lime silicate glass products - Part 3: Polished wired glass EN 572-4, Glass in building - Basic soda lime silicate glass products - Part 4: Drawn sheet glass EN 572-5, Glass in building - Basic soda lime silicate glass products - Part 5: Patterned glass EN 572-6, Glass in building - Basic soda lime silicate glass products - Part 6: Wired patterned glass EN 572-7, Glass in building - Basic soda lime silicate glass products - Part 7: Wired or unwired channel shaped glass EN 1036-1, Glass in building - Mirrors from silver-coated float glass for internal use - Part 1: Definitions, requirements and test methods EN 1096-1, Glass in building - Coated glass - Part 1: Definitions and classification EN 1279-1, Glass in Building - Insulating glass units - Part 1: Generalities, dimensional tolerances and rules for the system description EN 1748-1-1, Glass in building - Special basic products -Borosilicate glasses - Part 1-1: Definition and general physical and mechanical properties EN 1748-2-1, Glass in building - Special basic products - Glass ceramics - Part 2-1 Definitions and general physical and mechanical properties oSIST prEN 17074:2017

prEN 17074:2017

(E) 6 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 13024-1, Glass in building - Thermally toughened borosilicate safety glass - Part 1: Definition and description EN 14178-1, Glass in building - Basic alkaline earth silicate glass products - Part 1: Float glass EN 14179-1, Glass in building - Heat soaked thermally toughened soda lime silicate safety glass - Part 1: Definition and description EN 14321-1, Glass in building - Thermally toughened alkaline earth silicate safety glass - Part 1: Definition and description EN 15681-1, Glass in building - Basic alumino silicate glass products - Part 1: Definitions and general physical and mechanical properties EN 15682-1, Glass in building - Heat soaked thermally toughened alkaline earth silicate safety glass - Part 1: Definition and description EN 15683-1, Glass in building - Thermally toughened soda lime silicate channel shaped safety glass - Part 1: Definition and description EN 15755-1, Glass in building - Adhesive backed polymeric filmed glass - Part 1: Definitions and requirements EN 15804:2012+A1:2013, Sustainability of construction works - Environmental product declarations - Core rules for the product category of construction products EN 16477-1, Glass in building - Painted glass for internal use - Part 1: Requirements EN ISO 12543-1, Glass in building - Laminated glass and laminated safety glass - Part 1: Definitions and description of component parts (ISO 12543-1) EN ISO 12543-2, Glass in building - Laminated glass and laminated safety glass - Part 2: Laminated safety glass (ISO 12543-2) EN ISO 12543-3, Glass in building - Laminated glass and laminated safety glass - Part 3: Laminated glass (ISO 12543-3) EN ISO 14025, Environmental labels and declarations - Type III environmental declarations - Principles and procedures (ISO 14025) ISO 21930, Sustainability in buildings and civil engineering works - Environmental declaration of building products oSIST prEN 17074:2017

prEN 17074:2017 (E) 7 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 15804 and the following apply. 3.1 by-product substance or object resulting from a production process and meeting the following conditions: (a) further use is certain; (b) it can be used directly without any further processing other than normal industrial practice; (c) it is produced as an integral part of a production process; and (d) further use is lawful (SOURCE: DIRECTIVE 2008/98/EC, Article 5) 3.2 end-of-waste status certain specified waste shall cease to be waste when it has undergone a recovery, including recycling, operation and complies with specific criteria developed in accordance with the following conditions: (a) it is commonly used for specific purposes; (b) a market or demand exists; (c) it fulfils the technical requirements for the specific purposes and meets the existing legislation and standards applicable to products; and (d) the use will not lead to overall adverse environmental or human health impacts (SOURCE: DIRECTIVE 2008/98/EC, Article 6) Note 1 to entry: Criteria for determining when glass cullet destined for the production of glass substances or objects in re-melting processes ceases to be waste are established by the Commission Regulation No 1179/2012. 3.3 internal cullet composed of defective products detected and rejected by a quality control process during the industrial process of glass manufacturing, transition phases of product changes (such as thickness and/or colour changes) and production offcuts Note 1 to entry: These materials are immediately absorbed by the respective industrial process as a raw material for a new melting operation, not leaving the glass manufacturing plant. Internal cullet cannot be considered as waste as it was never a product. (SOURCE: JRC-IPTS Working document – EoW criteria for waste glass) 3.4 external cullet waste glass that is collected and/or reprocessed with the purpose of recycling Note 1 to entry: External cullet can be of two types, pre-consumer, also called post-industrial glass cullet, and post-consumer glass cullet. (SOURCE: JRC-IPTS Working document – EoW criteria for waste glass) oSIST prEN 17074:2017

prEN 17074:2017

(E) 8 3.5 pre-consumer cullet waste glass resulting from the manufacturing of products that contain glass as one of their components, and which leaves the specific facility where it was generated but not reaching the consumer market Note 1 to entry: An example of pre-consumer cullet is the glass cullet constituted by off cuts of the production of windows which leave the processing facility and are re-melted in the flat glass manufacturing facility. Note 2 to entry: Pre-consumer cullet if sorted properly fulfils the cullet specifications of the flat glass manufacturers and can be directly sent back to the furnace without additional treatment. (SOURCE:JRC-IPTS Working document – EoW criteria for waste glass) 3.6 post-consumer cullet waste glass originated after the use of the glass products at the consumer market (SOURCE:JRC-IPTS Working document – EoW criteria for waste glass) 3.7 similar product product covered by this PCR produced by the same company using the same production process 4 Products covered/ Products category 4.1 General Glass is used in a variety of construction applications to provide a transparent, impermeable barrier, which may have additional insulating, solar control, security, noise reduction or decorative properties. Glass is also used as a base component for other technologies such as photovoltaic cells, which may be incorporated in construction works. These Product Category Rules (PCR) are applicable to the production of flat glass for use in buildings such as: 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;

wired or unwired channel-shaped according to EN 572-7; 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 EN 14178-1; oSIST prEN 17074:2017
prEN 17074:2017 (E) 9
alumina silicate according to EN 15681-1; 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 EN 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 EN 14321-1;

heat soaked thermally toughened alkaline earth silicate safety glass according to EN 15682-1;

thermally toughened soda lime silicate channel shaped safety glass according to EN 15683-1, laminated glass and laminated safety glass according to EN ISO 12543-1, EN ISO 12543-2 and EN ISO 12543-3;

insulating glass unit according to EN 1279-1;
coated glass according to EN 1096-1;
mirror form silvered coated glass for interior use according to EN 1036-1;
painted glass according to EN 16477-1;
adhesive back polymeric filmed glass according to EN 15755-1;
surface worked glass (e.g. sand blasted, acid etched);

any combination of the above. NOTE The above list of products is not exhaustive. The PCR can also apply to other glass products not listed above. 4.2 Inclusion of several products in the same EPD Similar products can be presented in the same EPD but using different tables. A set of indicators and technical information per product shall be included. 5

Comparability of EPDs Comparison of EPDs of products used in buildings should consider the complete life cycle (cradle to grave EPDs) as it should be based on the product’s use and its impacts on the building (EN 15804). For comparison of EPDs of glass products used in buildings (comparisons at sub-building level), the requirements of comparability set out in EN 15804 and EN ISO 14025 shall be met. Comparison of EPDs is not a simple and direct process. It requires the assurance of comparable conditions and assumptions to avoid inaccurate conclusions. Functional requirements, as well as technical and environmental characteristics and conditions must be the same. oSIST prEN 17074:2017

prEN 17074:2017

(E) 10 6 Date of publication Conditions of EN 15804 apply. 7 PCR review Conditions of EN 15804 apply. 8 Expiration date Conditions of EN 15804 apply. 9 Product category rules for LCA 9.1 General A Life Cycle Analysis (LCA) shall be performed, conforming to this PCR, in order to identify the environmental impacts of each life cycle phase of the product. The scope of the LCA shall include a description of the following according to this PCR:

Functional unit;
Reference Service Life;
System boundaries;
Criteria for the exclusion of inputs and outputs (cut-off rules);
Selection of data and data quality requirements. 9.2

Functional unit For each of the glass products listed in point 4, the functional unit is 1 square metre (1 m2) of the respective product. The thickness and configuration of the glass products must be specified in the studies. Technical characteristics such as Transmittance, Reflectance, U-value, g-value, acoustics and safety classification should be declared in the studies (see relevant European Standards). 9.3 Reference Service Life As a reference, a service life of 30 years shall be used, unless otherwise indicated in product standard or specified by the manufacturer for specific in-use conditions. (SOURCE: Bundesinstitut für Bau-, Stadt- und Raumforschung (BBSR). 9.4 System boundaries The system boundaries define the unit processes that are included in the product system. The system boundaries of the EPD shall be described appropriately: cradle to gate, cradle to gate - with options, cradle to grave], etc. It should be apparent as to what processes are considered in what modules. The system boundaries covered by these rules include all life cycle stages, i.e. product stage, construction stage, use stage and end-of-life stage. The relevant modules included in each life cycle stage are illustrated in Table 1. oSIST prEN 17074:2017

prEN 17074:2017 (E) 11 Table 1 — Life cycle stages and modules covered in the context of this PCR PRODUCT STAGE CONSTRUCTION STAGE USE STAGE END-OF-LIFE STAGE Beyond Product System Raw Material supply (extraction, processing, recycled material) Transport to manufacturer Manufacture Transport to building site Installation in building Use/ application Maintenance Repair Replacement Refurbishment Operational energy use Operational water use Deconstruction/ demolition Transport to end-of-life Waste processing for reuse, recovery or recycling Disposal Reuse, recovery or recycling potential A1 A2 A3 A4 A5 B1 B2 B3 B4 B5 B6 B7 C1 C2 C3 C4 D q q q q u u q q q q u u q q q q q Module A3 of the product stage includes the manufacturing of flat glass and, in case it applies, the glass processing into different transformed glass products. In module A5 the ancillary elements to install the glass/ glass products in the building are not taken into account because there are many different considerations related to the installation in the building (depending on the type of building, frame materials, etc.). Thus, the ancillary elements will be considered in the scenarios established under the Environmental Product Declaration of the window/ façade systems. Flows related to human activities such as lighting, heating, cleaning of workshops, administration and employee transport are excluded from the system boundaries. The production of plants, machines and transportation systems is also excluded since the related flows are assumed to be negligible, compared to the production of glass products when the comparison is done at the timescale of the reference service life of plants, machines or transportation systems. Neither ISO 21930 nor EN 15804 include in the impact assessment the potential positive environmental impacts of the building, during its use phase, if they are due to the use of construction products with certain characteristics (like energy savings due to a better insulation or solar gains in the building when glass products are in use). Since these standards have not considered these benefits in the system boundaries, they shall not be included in the calculations of the results presented in the EPD. However, the calculation of the environment benefits, such as energy savings in the use phase should be presented as ‘additional information’ in the EPD. To calculate the energy benefits during the use phase of glass products, the methodology applicable in framework of the ‘energy labelling of windows’ should be used. oSIST prEN 17074:2017

prEN 17074:2017
(E) 12

Figure 1 — System Boundaries 9.5 Criteria for the exclusion of inputs and outputs (cut-off rules) In the life cycle assessment, all significant parameters from production data shall be included, i.e. all raw material used per formulation, utilised thermal energy, internal fuel and electric power consumption, direct production of waste and all available emission measurements. According to EN 15804, mass flows representing less than 1 % of the total mass input and/or energy flows representing less than 1% of the total primary energy usage of the associated unit process may be omitted. Cumulative omitted mass and energy usage shall not exceed 5 % per module (i.e. per module A, B, C or D). Substances of Very High Concern (SVHC) i.e. substances meeting the criteria in Article 57 and identified in accordance with Article 59(1) of REACH Regulation (EC) N°1907/2006, in a concentration above 0.1 % by weight of the glass final product, shall be included in the Life Cycle Inventory and the cut-off rules shall not apply. 9.6 Selection of data and data quality Selection of data and data quality requirements shall follow rules specified in EN 15804. As a general rule, manufacturer’s average data1) or specific data2) derived from specific production processes shall be the first choice as a basis for the LCA and EPD calculations. This type of data is required for at least the processes the producer of the glass products has influence over. In the case of this PCR, it means for flat glass manufacturing (module A3) and processing (module A’3). Table 2 — Application of generic and specific data MODULES MODULE A1-A3 A4 and A5 B1-B7 C1-C4 Production of commodities, raw materials Product manufacture Installation processes Use processes End-of-life processes Process type Upstream processes Processes the manufacturer has influence over Downstream processes Data type Generic data Manufacturer’s average or specific data Generic data

1) Average data – data representative of a product or product group provided by more than one supplier. 2) Specific data – data representative of a product or product group provided by one supplier. oSIST prEN 17074:2017

prEN 17074:2017 (E) 13 Generic data can be used in modules A1 and A’1 (production of raw materials for flat glass manufacturing -A1- and glass processing – A’1). Materials origins, extraction and/ preparation processes shall be properly and carefully selected from commercially available LCA databases and ideally confirmed by raw materials suppliers. That is particularly important in the case of materials with highest impacts in the results of the LCAs and environmental indicators. 9.7

Allocation of inputs and outputs (allocation rules) Allocation should be avoided as far as possible. Where unavoidable, allocation should be done on mass basis, except in the case of some glass specific products for which it should be done on surface (m2) basis. 9.8 Building Life Cycle Information 9.8.1 Product Stage (A1-A3 and A’1-A’3) 9.8.1.1 General Modules A1-A3 cover the production stage. Modules A1-A3 correspond to the manufacture of flat glass and modules A’1-A’3 to its further processing into flat glass products (see Figure 2). The information from these three modules can be given independently (for each of the sub-modules A1, A2 and A3) or aggregated (A1-A3). The definition of Modules A1-A3 should be specified in the scope of the study. For flat or rolled glass A1 to A3 represents the production of glass in the float or in the patterned line from cradle to gate. For other glass final products that need additional processing, flat glass is a raw material and shall be considered as a part of the A’1 module for the transformed glass products.

Figure 2 — Glass Manufa
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