prEN 17940

SLOVENSKI STANDARD
01-marec-2023
Steklo v gradbeništvu - Vmesna folija za izdelavo laminiranega stekla - Standard
za proizvod
Glass in Building - Folio Interlayers for the Manufacturing of Laminated Glass - Product
standard
Glas im Bauwesen - Folien-Zwischenlagen für die Herstellung von Verbundglas -
Produktnorm
Verre dans la construction - Films intercalaires pour la fabrication du verre feuilleté -
Norme de produit
Ta slovenski standard je istoveten z: prEN 17940
ICS:
81.040.20 Steklo v gradbeništvu Glass in building
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2023
ICS 81.040.20
English Version
Glass in Building - Folio Interlayers for the Manufacturing
of Laminated Glass - Product standard
Verre dans la construction - Films intercalaires pour la Glas im Bauwesen - Folien-Zwischenlagen für die
fabrication du verre feuilleté - Norme de produit Herstellung von Verbundglas - Produktnorm
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 129.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17940:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 5
4 General. 5
5 Properties of folios before processing . 5
5.1 Dimensions. 5
5.1.1 Length and width . 5
5.1.2 Thickness . 5
5.2 Appearance . 6
5.2.1 General. 6
5.2.2 Methods of observation and measurement . 6
5.3 Mechanical Properties . 7
5.4 Safety in the case of fire (cf. Reaction to fire EN 13501-1) . 7
5.5 Thermal and other physical properties . 7
6 Properties of processed folios . 8
6.1 General. 8
6.2 Adhesion . 8
6.3 Radiation resistance . 9
6.4 Spectral properties and other optical properties . 9
6.5 Acoustic properties . 9
Annex A (informative) Documentation . 10
Annex B (informative) Considerations for optimising accuracy in determination of luminous and
solar properties of folio interlayers . 12
Bibliography . 13

European foreword
This document (prEN 17940:2023) 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.
1 Scope
This document specifies the composition, tolerances and characteristics, i.e. mechanical, acoustic, optical,
and thermal properties, of folio interlayers for the manufacturing of laminated glass and laminated safety
glass for use in buildings and construction works and it defines their general quality criteria.
This document does not apply to interlayers for laminated glass which are achieved by pouring the
interlayer material in liquid state on or between the plies of glass or plastic glazing sheet material
followed by drying or chemical or ultraviolet curing.
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 410:2011, Glass in building — Determination of luminous and solar characteristics of glazing
EN 16613:2019, Glass in building — Laminated glass and laminated safety glass — Determination of
interlayer viscoelastic properties
EN ISO 489:2022, Plastics — Determination of refractive index
EN ISO 1183-1:2019, Plastics — Methods for determining the density of non-cellular plastics — Part 1:
Immersion method, liquid pycnometer method and titration method (ISO 1183-1:2019, Corrected version
2019-05)
EN ISO 1716:2018, Reaction to fire tests for products — Determination of the gross heat of combustion
(calorific value) (ISO 1716:2018)
EN ISO 11357-4:2021, Plastics — Differential scanning calorimetry (DSC) — Part 4: Determination of
specific heat capacity (ISO 11357-4:2021)
EN ISO 12543-1:2021, Glass in building — Laminated glass and laminated safety glass — Part 1:
Vocabulary and description of component parts (ISO 12543-1:2021)
EN ISO 12543-2:2021, Glass in building — Laminated glass and laminated safety glass — Part 2:
Laminated safety glass (ISO 12543-2:2021)
EN ISO 12543-3:2021, Glass in building — Laminated glass and laminated safety glass — Part 3:
Laminated glass (ISO 12543-3:2021)
EN ISO 12543-4:2021, Glass in building — Laminated glass and laminated safety glass — Part 4: Test
methods for durability (ISO 12543-4:2021)
EN ISO 12543-6:2021, Glass in building — Laminated glass and laminated safety glass — Part 6:
Appearance (ISO 12543-6:2021)
EN ISO 22007-4:2017, Plastics — Determination of thermal conductivity and thermal diffusivity — Part 4:
Laser flash method (ISO 22007-4:2017)
ISO 527-3:2018, Plastics — Determination of tensile properties — Part 3: Test conditions for films and
sheets
ISO 11359-2:2021, Plastics — Thermomechanical analysis (TMA) — Part 2: Determination of coefficient of
linear thermal expansion and glass transition temperature
ASTM D1003:2021, Standard Test Method for Haze and Luminous Transmittance of Transparent Plastics
ASTM E313:2020, Standard Practice for Calculating Yellowness and Whiteness Indices from Instrumentally
Measured Color Coordinates
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 12543-1:2021 and
EN ISO 12543-6:2021 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
4 General
The folio manufacturer is responsible for the preparation and maintenance of a product description. The
folios may be described either in full, i.e. chemical composition, or by a manufacturer’s code. Further
guidance on documentation is given in Annex A.
Clause 5 covers the properties which are measured on the folio supplied, Clause 6 covers the folio
properties which are determined on laminated glass incorporating the folio to be assessed.
Some folios reach their final properties only after the lamination process. This must be considered in the
evaluation of the interlayer properties to this standard.
5 Properties of folios before processing
5.1 Dimensions
5.1.1 Length and width
The nominal length and width of the folio shall be provided by the folio manufacturer. The actual length
and width of the folio product supplied shall not be less than the nominal length and width.
The oversize in width should be agreed upon by the laminated glass producer and folio manufacturer and
can vary with nature of the lamination process.
5.1.2 Thickness
The actual thickness d shall be the average of three measurements, taken to 0,01 mm at the edges and the
centre of the folio interlayer. The measurement shall be performed my means of an instrument of the
calliper micrometre type at a temperature of (23 ± 3) °C. The measurement shall be taken having applied
a pressure to the interlayer of not more than 60 N/m for 5 s to10 s.
NOTE 1 The relative ambient humidity does not have a significant influence on the result of the thickness
measurement.
The nominal thickness of the folio shall be provided by the folio manufacturer. The actual thickness of the
folio supplied, rounded to the nearest 0,01 mm, shall not vary from the nominal thickness by more than
the tolerances shown in Table 1.
Table 1 — Tolerances on nominal thickness
Nominal thickness Tolerances
mm mm
d ≤ 1 ±0,05
1 < d ≤ 2 ±0,07
d > 2 ±0,1
Product specific thickness tolerances should be available from the folio interlayer manufacturer.
NOTE 2 For the final laminated glass, clause 4.1.2.1 of EN ISO 12543-5:2021 also applies.
5.2 Appearance
5.2.1 General
The folio manufacturer shall have a process in place to control foreign particles and/or contaminations
that can lead to defects in the laminated glass.
5.2.2 Methods of observation and measurement
5.2.2.1 General
In order to check the appearance of the interlayer supplied a representative folio sample of at least 1 m
size is inspected with the naked eye and under normal diffused lighting conditions, (natural daylight or
simulated daylight, between 300 lx and 600 lx at the folio) from a distance of 1 m. The direction of
observation is normal, i.e. at right angles, to the folio. When inspected to this observation method, holes,
creases and unintentional streaks are not allowed.
5.2.2.2 Spot faults
The largest dimension (diameter or length) of these faults is measured with a micrometre with
graduations in tenths of a millimetre. The number and dimensions of the spot faults are noted. Table 2
gives the allowable number of faults.
Table 2 —Acceptance levels of spot faults
Dimension of spot faults Average per 20 m
mm
≤ 0,5 Any number
> 0,5 and ≤ 1,0 3
> 1,0 and ≤ 3,0 0,6
> 3,0 0,05
NOTE The word average indicates a cumulative average over at least 2 000 m of foil.
5.2.2.3 Linear/extended faults
The sample is inspected to the observation method described in 5.2.2 and the presence of visually
disturbing faults is noted.
2 2
The allowable number of faults is an average 0,05 faults in 20 m of foil, related to at least 2 000 m .
5.3 Mechanica
...