Further information and descriptions of functional and insulated glazing products.
Insulating glass is also known as thermal insulation glazing if at least one of the panes is coated. This coating can significantly reduce the proportion of heat loss due to radiation.
The glass coatings are made from precious metals or metal oxides. To prevent damage during normal use or cleaning, coatings are usually applied to one of the faces on the inside of the space between the panes – normally in position 3, i.e. the outside of the inner pane of insulating glass. If the coating has to be applied to the outer pane in position 2, the U value and light transmittance values are not affected. However, the G value falls slightly by approx. 4 %. The appearance can vary slightly, especially if the glazed units are installed next to each other.
As well as standard double glazed, thermal insulation products, GIP Glazing also offers special climate protection glazing products under the name SGG CLIMATOP LUX. These are special triple glazed windows with outstanding thermal transmittance coefficients. They are coated in positions 2 and 5 and are also filled with a noble gas. This enables them to achieve Ug values of up to 0.5 W/m²K. SGG CLIMATOP LUX glazing has a very high total solar energy transmittance value. The triple glazed structure features a thermally improved spacer SGG SWISSPACER as standard.
Explanation of technical data
The light and energy values stated refer to European standards, especially DIN EN 410. All data are valid for perpendicular incidence. The thermal transmittance coefficient is stated for a vertical window in accordance with DIN EN 673.
Light transmittance (DIN EN 410)
The light transmittance data provided refer to wavelengths for visible light from 380 nm to 780 nm and are weighted according to spectral sensitivity of the human eye.
Total solar energy transmittance (DIN EN 410)
The total solar energy transmittance value g refers to wavelengths from 300 nm to 2500 nm. This is the sum of the primary solar transmittance value (heat from direct solar radiation) and the secondary solar transmittance value (heat released into the building from the glass itself via radiation and convection).
UV transmittance (DIN EN 410)
UV transmittance data are stated for wavelengths from 280 nm to 380 nm.
Colour rendering index (DIN EN 410)
The colour rendering index (Ra) describes the colour rendering properties of a window. A Ra value of over 90 means very good colour rendering.
Thermal transmittance coefficient Ug (DIN EN 673)
The thermal transmittance coefficient of a window describes how much energy is lost through a window per second and per m² of glass at a temperature difference of 1 Kelvin. The lower the value, the less heat is lost. The use of pane coatings, inert gas fills and the width of the space between the panes are the key factors that influence the thermal transmittance coefficient. In contrast, the glass thickness has a negligible effect in most cases. Consequently, the Ug values calculated in accordance with DIN EN 673 for standard glass thicknesses depend on the emission grade of the coating and gas fill.