EN 14321-1:2005

SLOVENSKI STANDARD
01-september-2005
Steklo v gradbeništvu – Kaljeno zemljoalkalijsko silikatno varnostno steklo – 1.
del: Definicije in opis
Glass in building - Thermally toughened alkaline earth silicate safety glass - Part 1:
Definition and description
Glas im Bauwesen - Thermisch vorgespanntes Erdalkali-Silicat-
Einscheibensicherheitsglas - Teil 1: Definition und Beschreibung
Verre dans la construction - Verre de silicate alcalino-terreux de sécurité trempé
thermiquement - Partie 1 : Définition et description
Ta slovenski standard je istoveten z: EN 14321-1:2005
ICS:
81.040.20 Steklo v gradbeništvu Glass in building
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 14321-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2005
ICS 81.040.20
English version
Glass in building - Thermally toughened alkaline earth silicate
safety glass - Part 1: Definition and description
Verre dans la construction - Verre de silicate alcalino- Glas im Bauwesen - Thermisch vorgespanntes Erdalkali-
terreux de sécurité trempé thermiquement - Partie 1 : Silicat-Einscheibensicherheitsglas - Teil 1: Definition und
Définition et description Beschreibung
This European Standard was approved by CEN on 19 May 2005.
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 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 translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
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 STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14321-1:2005: E
worldwide for CEN national Members.

Contents Page
Foreword .4
Introduction.5
1 Scope .6
2 Normative references .6
3 Terms and definitions.6
4 Glass products.7
5 Fracture characteristics .7
6 Dimensions and tolerances.7
6.1 Nominal thickness and thickness tolerances.7
6.2 Width and length (sizes).8
6.2.1 General .8
6.2.2 Maximum and minimum sizes.9
6.2.3 Tolerances and squareness.9
6.2.4 Edge deformation produced by vertical toughening.10
6.3 Flatness .11
6.3.1 General .11
6.3.2 Measurement of overall bow .11
6.3.3 Measurement of local bow .13
6.3.4 Limitation on overall and local bow.13
7 Edge work, holes, notches and cut-outs.14
7.1 Warning .14
7.2 Edge working of glass before toughening.14
7.3 Profiled edges .15

7.4 Round holes .15
7.4.1 General .15
7.4.2 Diameter of holes.15
7.4.3 Limitations on position of holes .15
7.4.4 Tolerances on hole diameters.17
7.4.5 Tolerances on position of holes .17
7.5 Notches and cut-outs .18
7.6 Shaped panes.18
8 Fragmentation test.19

8.1 General .19
8.2 Dimensions and number of test specimens .19
8.3 Test procedure .19
8.4 Assessment of fragmentation.20
8.5 Minimum values from the particle count.20
8.6 Selection of the longest particle .21
8.7 Maximum length of longest particle .21
9 Other physical characteristics .21
9.1 Optical distortion .21
9.1.1 Thermally toughened alkaline earth silicate safety glass produced by vertical toughening.21
9.1.2 Thermally toughened alkaline earth silicate safety glass produced by horizontal
toughening .21
9.2 Anisotropy (iridescence) .21
9.3 Thermal durability.21
9.4 Mechanical strength .22
9.5 Classification of performance under accidental human impact.22
10 Marking .22
Annex A (informative) Curved thermally toughened alkaline earth silicate safety glass.23
Annex B (informative) Example of particle count .24

Figures
Figure 1 — Examples of width, B, and length, H, relative to the pane shape .8
Figure 2 — Tolerance limits for dimensions of rectangular panes.9
Figure 3 — Tong mark deformation .10
Figure 4 — Representation of overall and local bow .12

Figure 5 — Support conditions for the measurement of overall bow.13
Figure 6 a) — Arrissed edge (with blank spots) .14
Figure 6 b) — Ground edge (with blank spots).14
Figure 6 c) — Smooth ground edge (no blank spots).15
Figure 6 d) — Polished edge.15
Figure 7 — Relationship between hole and edge of pane .16
Figure 8 — Relationship between two holes .16
Figure 9 — Relationship between hole and corner of pane .17
Figure 10 — Examples of the positioning of holes relative to the datum point.18
Figure 11 — Examples of notches and cut-outs .18
Figure 12 — Position of impact point.19
Figure 13 — Area to be excluded from the particle count determination and largest particle
measurement.20
Figure 14 — Examples of crack-free particles and the assessment regarding the number .20
Figure B.B1 — Select the area of coarsest fracture, place the template on the test specimen and
draw round the template .24
Figure B.B2 — Mark and count the perimeter fragments as 1/2 particle each.25
Figure B.B3 — Mark and count the central fragments and add these to the perimeter count to
obtain the particle count for the specimen .26

Tables
Table 1 — Nominal thicknesses and thickness tolerances .8
Table 2 — Tolerances on width, B, and length, H .10

Table 3 — Maximum values for overall and local bow.14
Table 4 — Tolerances on hole diameters.17
Table 5 — Minimum particle count values.21
Table 6 — Values for the mechanical strength of thermally toughened alkaline earth silicate safety
glass.22

Foreword
This European Standard (EN 14321-1:2005) has been prepared by Technical Committee CEN/TC 129 “Glass
in building”, the secretariat of which is held by IBN/BIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by December 2005, and conflicting national standards shall be withdrawn
at the latest by December 2005.
This European Standard has been prepared under a mandate given to CEN by the European Commission
and the European Free Trade Association.
No existing European Standard is superseded.
This Part of the European Standard does not stand-alone, it is a part of one standard:
 EN 14321-1: Glass in building – Thermally toughened alkaline earth silicate safety glass – Part 1:
Definition and description;
 prEN 14321-2: Glass in building – Thermally toughened alkaline earth silicate safety glass – Part 2:
Evaluation of conformity.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and United Kingdom.
Introduction
Thermally toughened alkaline earth silicate safety glass has a safer breakage behaviour when compared with
annealed glass. When it should be used to offer protection under accidental human impact, thermally toughened
alkaline earth silicate safety glass also should be classified according to EN 12600.
NOTE CEN/TC129/WG8 is producing standards for the determination of the design strength of glass and is preparing
a design method.
1 Scope
This European Standard specifies tolerances, flatness, edgework, fragmentation and physical and mechanical
characteristics of monolithic flat thermally toughened alkaline earth silicate safety glass for use in buildings.
Information on curved thermally toughened alkaline earth silicate safety glass is given in Annex A, but this product
does not form part of this European Standard.
Other requirements, not specified in this European Standard, can apply to thermally toughened alkaline earth
silicate safety glass which is incorporated into assemblies, e.g. laminated glass or insulating units, or undergo an
additional treatment, e.g. coating. The additional requirements are specified in the appropriate product standard.
Thermally toughened alkaline earth silicate safety glass, in this case, does not lose its mechanical or thermal
characteristics.
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 1096-1, Glass in building — Coated glass — Part 1: Definitions and classification
EN 12600, Glass in building — Pendulum test — Impact test method and classification for flat glass
EN 14178-1, Glass in building — Basic alkaline earth silicate glass products — Part 1: Float glass
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
3.1
thermally toughened alkaline earth silicate safety glass
glass within which a permanent surface compressive stress has been induced by a controlled heating and
cooling process in order to give it greatly increased resistance to mechanical and thermal stress and
prescribed fragmentation characteristics
3.2
flat thermally toughened alkaline earth silicate safety glass
thermally toughened alkaline earth silicate safety glass that has not been deliberately given a specific profile
during manufacture
3.3
enamelled thermally toughened alkaline earth silicate safety glass
thermally toughened alkaline earth silicate safety glass which has a ceramic frit fired into the surface during
the toughening process. After toughening the ceramic frit becomes an integral part of the glass
NOTE In the UK, this glass is also known as opaque thermally toughened alkaline earth silicate safety glass.
3.4
horizontal toughening
process in which the glass is supported on horizontal rollers
3.5
vertical toughening
process in which the glass is suspended by tongs
4 Glass products
Thermally toughened alkaline earth silicate safety glass shall be made from a monolithic glass generally
corresponding to the following standard:

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