SCHOTT North America

Functions ASI® Glass: Thermal Insulation

Building insulation with ASI^® Glass

Minimizing thermal loss in winter

The U-value refers to the thermal insulation effect of the building; it is the coefficient of heat transmission for the materials that comprise the building shell. The glazing must serve two purposes: it must be transparent to sunlight, but insulate from thermal radiation. Modern glass coatings (low-e coatings) facilitate the separation of the shorter wavelength sunlight from the longer wavelength thermal radiation. In the table below U-values of various glazing systems are compared to those of ASI THRU^® double glazing. The photovoltaic ASI THRU^® double glazed elements reach low U-values comparable with high-quality conventional double glazing; hence they are suitable for large areas of glazing without sacrificing any loss in thermal comfort during the winter and, most importantly, with the additional benefit of generating electricity.

u-Values of different glazings

	U-Value (EN673)
Single glass pane or laminated glass	5-6 W/m²K
Double glazed unit without low-e coating	2.7 W/m²K
Double glazed unit with low-e coating	1.2 W/m²K
ASI THRU^® double glazed unit	1.2 W/m²K

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555 Taxter Road
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