Glass

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Many might think you only have to choose between single-pane, double-pane, or triple-pane glass when deciding which window style is right for your needs. But there are even more choices with focus on energy efficiency and high performance as well as aesthetics. Review this information to learn how different Low-E coatings, panes, and other enhancements affect the performance of your windows. Glazing is the main part of the total surface of a window, constituting averagely around 70% to 80% of its surface. Thus, its effect on energy efficiency, noise reduction and security is huge.
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Basic natural properties of glass

Density:  88 χ 10-7m/°C
Linear expansion coefficient: 88 χ 10-7m/°C
Thermal permeability: (u-value) 5,2 – 5,8 watt/m2*°C (depending on thickness)
Thermal conductivity: (Κ-value) 1,05 watt/m*°C

Resistance to temperature differences: a 6mm glass that has been artificially heated will break from thermal shock if immersed in water with a temperature difference above 55 ° C.
Resistance to compression: 1000 MPa. It is extremely high and means that to crush a 1cm3 glass volume cube a weight of 10 tons must be applied.
Tensile strength: 40 MPa (this number rises to thermally amplified glass at 200 MPa) clearly reduced in relation to resistance to compression.
Melting point: At about  730°C.
Elasticity: (coefficient Young) 70 GPa . This factor expresses the theoretical power (per unit area) that should be applied in a glass sample, in order to  double its original length.
Transverse contraction coefficient: (Poisson ratio μ) 0,22
Hardness: 6.5 Moh scale (diamond has 10,sapphire 9 and plaster 2)
Dielectric constant: for 6mm glass at 21°C
  • 1 GHz 6,0
  • 10 MHz 6,5
  • 1 KHZ 7,4
  • 10 Hz 30,0
Refractive factor:  1,52 (this factor varies depending on the wavelength of the light under consideration)
Bright reflection: (Loss of light due to reflection) about 8% to 10%. The light, when passing through a dividing surface of 2 optical media with different refractive indices, (eg air-glass) is always reflected. The percentage of light reflected, depends on the refractive indices of the materials and the angle of incidence of light.
Bright permeability: About 85% for 6mm glass.
Translucent ultraviolet radiation: in wavelength 340nm 41% , to 315nm 1%.
Chemical strength: Glass is extremely resistant to most acids in addition to hydrofluoric, at high temperatures and in phosphate. However, it is sensitive to alkalis. Also soluble sulfide impurities from metal corrosion tend to adhere permanently to the free surface of the glass which must be removed as soon as possible.
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