ET ISO 16293-1: Glass in building -- Basic soda lime silicate glass products -- Part 1: Definitions and general physical and mechanical properties

2008·1.4 MB·English

by  Quality and Standards Authority of Ethiopia (QSAE)

Federal Democratic
Republic of Ethiopia
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ET ISO 16293-1 (2008) (English): Glass
in building -- Basic soda lime silicate
glass products -- Part 1: Definitions
and general physical and mechanical
properties

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(cid:3)(cid:3)(cid:3)(cid:3)(cid:3)Published by Ethiopian Standards Agency
©ESA
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This  Ethiopian  Standard  has  been  prepared  under  the  direction  of  the  Technical  Committee  for      
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The  standard  is  identical  with(cid:3)(cid:47)(cid:94)(cid:75)(cid:3)(cid:1005)(cid:1010)(cid:1006)(cid:1013)(cid:1007)(cid:882)(cid:1005)(cid:855)(cid:1006)(cid:1004)(cid:1004)(cid:1012)(cid:894)(cid:28)(cid:895)(cid:3)(cid:39)(cid:367)(cid:258)(cid:400)(cid:400)(cid:3)(cid:349)(cid:374)(cid:3)(cid:271)(cid:437)(cid:349)(cid:367)(cid:282)(cid:349)(cid:374)(cid:336)(cid:3)(cid:886)(cid:3)(cid:17)(cid:258)(cid:400)(cid:349)(cid:272)(cid:3)(cid:400)(cid:381)(cid:282)(cid:258)(cid:3)(cid:367)(cid:349)(cid:373)(cid:286)(cid:3)(cid:400)(cid:349)(cid:367)(cid:349)(cid:272)(cid:258)(cid:410)(cid:286)(cid:3)(cid:336)(cid:367)(cid:258)(cid:400)(cid:400)(cid:3)(cid:393)(cid:396)(cid:381)(cid:282)(cid:437)(cid:272)(cid:410)(cid:400)(cid:3)(cid:886)
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For  the  purpose  of  this  Ethiopian  Standard  ,  the  adopted  text  shall  be  modified  as  follows.    
(cid:891)(cid:3)The  phrase  “International  Standard”  shall  be  read  as  “Ethiopian  Standard”;  and    
(cid:891)(cid:3)A  full  stop  (.)  shall  substitute  comma  (,)  as  decimal  marker.
ISO 16293-1:20 (E)

Glass in building —— Basic soda lime silicate glass products ——
Part 1:
Definitions and general physical and mechanical properties
1 Scope
This part of ISO 16293 defines and classifies basic soda-lime silicate glass products, indicates their chemical
composition, their main physical and mechanical characteristics and defines their general quality criteria.
Specific dimensions and dimensional tolerances, description of faults, quality limits and designation for the
product types are not included in this part of ISO 16293.
NOTE It is intended to include the specific dimensions and dimensional tolerances, description of faults, quality limits
and designation for the product types in the future ISO 16293-2, which is specific to float glass.
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.
ISO 9050, Glass in building —— Determination of light transmittance, solar direct transmittance, total solar
energy transmittance, ultraviolet transmittance and related glazing factors
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
float glass
flat, transparent, clear or tinted soda-lime silicate glass having parallel and polished faces obtained by
continuous casting and flotation on a metal bath
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ISO 16293-1:20 (E)
4 Chemical composition
4.1 General
The basic glass products covered by this part of ISO 16293 are all manufactured from soda-lime silicate glass
having a composition with the percent mass fraction of the major components within the following ranges:
 silicon dioxide (SiO ) 69 % to 74 %;
2
 calcium oxide (CaO) 5 % to 14 %;
 sodium oxide (Na O) 10 % to 16 %;
2
 magnesium oxide (MgO) 0 % to 6 %;
 aluminium oxide (Al O ) 0 % to 3 %;
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 others 0 % to 5 %.
In addition to the above general composition, these glasses may also contain small quantities of other
substances.
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 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
Characteristic Symbol Numerical value and unit
Density (at 18 °C) ρ 2 500 kg/m3
Hardness 6 units (Mohs’’ scale)
Young’’s modulus (modulus of elasticity) E 7 × 1010 Pa
Poisson’’s ratio µ 0,2
Specific heat capacity c 0,85 × 103 J/(kg ⋅ K) (at 50 °C)
Average coefficient of linear expansion α 9 × 10−6 K−1
between 20 °C and 300 °C
Thermal conductivity λ 1 W/(m ⋅ K)
Mean refractive index to visible n 1,5
radiation (380 nm to 780 nm)
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ISO 16293-1:20 (E)
5.2 Designation of clear glass
5.2.1 General
A glass product is designated as clear glass when it is not tinted and when the light transmittance of the glass
material, unmodified by the possible presence of a coating, complies with 5.2.2.
In order to measure the light transmittance characteristics of glass to determine whether it can be designated
as a clear glass, it is necessary, in some cases, to carry out a pre-treatment to eliminate the coatings on
smooth surfaces without significantly modifying the thickness of the glass substrate.
The light transmittance of the glass substrate shall be measured with its surfaces in a polished condition.
Measurement shall be in accordance with ISO 9050.
NOTE The light transmittance values given in 5.2.2 are not suitable for design. They are values used only for the
designation of clear glass and exclude the effects of coatings. It is necessary to obtain the values of light transmittance
used for design from the glass manufacturer.
5.2.2 Clear transparent glass
A transparent glass product is designated as clear glass when it is not tinted and when its light transmittance,
after any necessary pre-treatment and rounded to the nearest 0,01, is greater than or equal to the value given
in Table 2 for the nominal thickness of the glass product.
NOTE The limiting value given in Table 2 is appropriate provided that the measured thickness of the glass product is
within the allowable tolerances for the nominal thickness of that product.
Table 2 —— Minimum light transmittance values
for designating a transparent glass product as clear glass
Nominal thickness Minimum value of light
transmittance
mm
2 0,89
3 0,88
4 0,87
5 0,86
6 0,85
8 0,83
10 0,81
12 0,79
15 0,76
19 0,72
25 0,67
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ISO 16293-1:20 (E)
5.3 Stability of physical and chemical characteristics
For basic glass products, the physical and chemical characteristics can be considered as remaining constant
over time.
a) Since glass is insensitive to photochemical effects, the spectral properties (transmission of light and solar
energy) of the basic glass products are not modified by direct or indirect solar radiation.
b) The surface of the glass used in building is virtually insensitive to attack from the environment.
6 General quality criteria and their evaluation
6.1 Optical quality
This criterion concerns the visibility of objects observed through the glass and only applies to transparent
glass products.
The main faults that can affect the optical quality are distortion of the surface and lack of homogeneity in the
body of the glass.
The optical quality shall be evaluated by means of a visual observation method.
6.2 Appearance
This criterion concerns the appearance of the product.
The visual quality can be affected by the presence of spot faults (bubbles, stones, etc.), linear/extended faults
(scuff marks, scratches, lines, deposits, impressions, etc.).
Spot faults are evaluated by specifying numbers and dimensions.
Linear/extended faults are evaluated by visual observation.
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Organization and Objectives

The Ethiopian Standards Agency (ESA) is the national standards body of Ethiopia
established in 2010 based on regulation No. 193/2010.ESA is established due to the
restructuring of Quality and Standards Authority of Ethiopia (QSAE) which was
established in 1970.

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ESA’s objectives are:-

(cid:153)(cid:3)Develop Ethiopian standards and establish a system that enable to
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c check weather goods and services are in compliance with the
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