EN 14178-1:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Steklo v stavbah - Osnovni izdelki iz zemljoalkalijskega silikatnega stekla – 1. del: Ravno stekloGlas im Bauwesen - Basiserzeugnisse aus Erdalkali-Silicatglas - Teil 1: FloatglasVerre dans la construction - Verre de silicate alcalinoterreux de base - Partie 1: Glace flottéeGlass in building - Basic alkaline earth silicate glass products - Part 1: Float glass81.040.20Steklo v gradbeništvuGlass in buildingICS:Ta slovenski standard je istoveten z:EN 14178-1:2004SIST EN 14178-1:2005en01-marec-2005SIST EN 14178-1:2005SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14178-1October 2004ICS 81.040.20 English versionGlass in building - Basic alkaline earth silicate glass products -Part 1: Float glassVerre dans la construction - Verre de silicate alcalinoterreuxde base - Partie 1: Glace flottéeGlas im Bauwesen - Basiserzeugnisse aus Erdalkali-Silicatglas - Teil 1: FloatglasThis 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 14178-1:2004: ESIST EN 14178-1:2005

Figure 1 — Relationship between length, width and direction of draw 3.3 jumbo sizes glass delivered in the following sizes: SIST EN 14178-1:2005

Nominal length H: 4500 mm, 5100 mm or 6000 mm
Nominal width B: 3210 mm NOTE The usual width is 3210 mm. Exceptional production requirements may cause this to be reduced but the nominal width is never below 3150 mm 3.4 split sizes glass delivered in the following size ranges:
Nominal length H: 1000 mm to 2550 mm
Nominal width B: 3210 mm NOTE The usual width is 3210 mm. Exceptional production requirements may cause this to be reduced but the nominal width is never below 3150 mm. 3.5 final cut size pane of glass that has been cut down to the dimensions being required either for installation or processing into a final product e.g. insulating glass units, thermally toughened safety glass, …of those dimensions 3.6 optical faults these are faults that lead to distortions in the appearance of objects observed trough the glass 3.7 visual faults faults, which alter the visual quality of the glass. They are spot faults and linear / extend faults 3.8 spot faults a spot fault is a nucleus, which is sometimes accompanied by a halo of distorted glass. The dimension of a spot fault comprising a nucleus with a halo is obtained by multiplying the dimension of the nucleus by a factor of approximately 3 3.9 linear / extended faults these faults can be on or in the glass, in the form of deposits, marks or scratches that occupy an extended length or area 3.10 edge defects these defects can occur on the edge of a cut size piece in the form of entrant and emergent faults and / or bevels 4 Chemical composition 4.1 Principal constituents The magnitude of the proportions by mass of the principal constituents of all the alkaline earth silicate glass products covered by this document is as follows:
Silicon Dioxide
SiO2
55 - 70 %
Calcium Oxide
CaO
3 - 12% SIST EN 14178-1:2005
Potassium Oxide
K2O
5- 14%
Aluminium Oxide
Al2O3
0 - 15 %
Zirconium Oxide
ZrO2
0– 8 %
Strontium Oxide
SrO
Barium Oxide
BaO
1– 15 %
Others
0 – 10 % 4.2 Tint Body tinted glass is obtained by the addition of suitable materials. 5 Physical and mechanical characteristics 5.1 General characteristics Conventional numerical values for the physical and mechanical characteristics of basic alkaline earth silicate glass products are given in Table 1. These values, for normal annealed glass without any further toughening, are not precise requirements with which the glass shall strictly comply, but are the generally accepted figures for use in calculations where a high degree of accuracy is not required.
Table 1 — General characteristic values of alkaline earth silicate glass Characteristic Symbol Value and unit Density (at 18oC) ρ 2700 kg/m3 Hardness (Knoop) HK0,1/20 5 – 6 Gpa Young's modulus (modulus of elasticity) E 7,7 x 1010 Pa
Poisson's ratio µ 0,2 Characteristic bending strength fg,kkkk 45 x 106 Pa [1] Specific heat capacity cp 0,7 x 103 J/(kg K) Nominal value of average coefficient of linear expansion between 20 oC and 300 oC α 8 x10-6/K Resistance against temperature differential and sudden temperature change
40 K [2] Thermal conductivity λ 0,8 - 1,1 W/(m K) Mean refractive index to visible radiation (at 589,3 nm) n 1,5 SIST EN 14178-1:2005

The characteristic bending strength has to be used in conjunction with the design method given in prEN 13474 [2]
Generally accepted value that is influenced by edge quality and glass type
5.2 Designation of clear alkaline earth silicate glass An earth alkaline silicate glass product is defined as clear alkaline earth silicate glass when it is not tinted and when the light transmittance of the glass material, unmodified by the possible presence of a coating:
- after any necessary pre-treatment
- measured according to EN 410
- rounded to the nearest 0,01 is greater than or equal to the value given in Table 2 for the nominal thickness of the alkaline earth silicate glass product. In order to measure the light transmittance characteristics of alkaline earth silicate glass, to determine whether it can be classified as clear, it is necessary, in some cases, to carry out a pre-treatment:
- coatings on smooth surfaces have to be eliminated, without modifying the thickness of the alkaline earth silicate glass substrate. The light transmittance of an alkaline earth silicate glass substrate has to be measured with its surfaces in a polished condition. Table 2 — Mean values for determining if a transparent alkaline earth silicate glass product is clear Nominal thickness in mm Mean value(1,2) 2 3 4 5 6 8 10 12 15
0,90 0,90 0,90 0,89 0,89 0,88 0,87 0,86 0,84 1) The limiting values given are applicable provided that the measured thickness of the alkaline earth silicate glass product is within the allowable tolerances for the nominal thickness of that product.
2) The values given are not suitable for design.
They are values used only for the definition of clear alkaline earth silicate glass and exclude the effects of coatings.
The values of light transmittance used for design should be obtained from the glass manufacturer, measured according to EN 410.
a) Since glass is insensitive to photochemical effects, the spectral properties (transmissions of light and solar energy) of the basic earth alkaline silicate glass products are not modified by direct or indirect solar radiation.
b) The surface of glass used in building is virtually insensitive to attack from the environment. NOTE: Whilst the surface of the glass when installed in a building is virtually
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