Ug, g, gtot, CE marking


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Calculation of radiation characteristics according to EN 410, EN 673, EN ISO 52022-3 and ISO 15099 / ASHRAE.


WINSLT® is the software solution for calculating light, solar and thermal characteristics of glazing in combination with solar shading.
In a short period of time, any structure can be created and calculated according to the following standards:

  • EN ISO 673 -> Ug value
  • EN 410 -> g value, Reflection, Absorption, Transmission
  • EN ISO 52022-3 -> gtotal value
  • ISO 15099 / ASHRAE -> Ug value, SHGC value, Reflection, Absorption,

The software certified by ift Rosenheim also creates a declaration of performance and a CE marking for the glazing.


  • Extensive database with various products from international glass and sun
    protection manufacturers
  • Import of own spectral data
  • Boundary conditions according to EN ISO 52022-3, ASHRAE or freely definable
  • Calculation of arbitrary disc structures
  • Representation of the temperature curve across the cross-section
  • Calculation of reflection, transmission and absorption
  • Preparation of a declaration of performance and CE marking for any glass
    structures in many language versions



Extraction of spectral data of laminated safety glass films from spectral data of entire laminated safety glass assemblies and extraction of spectral data of coatings from the spectral data of coated glasses. The extracted data can then be combined with other glasses than measured.

Our video describing the WINSLT® Extractor


Creation of any blind slats (width, distance, inclination, position of the sun) from any slat material.


Calculation of the radiation-physical and thermal characteristics according to ISO 15099 with the specifications of ASHRAE.

North American standard ISO 15099 for calculating the thermal performance of windows, doors and sunshades, in some cases, provides two ways to calculate a characteristic value. Therefore, the professional association of all companies in the heating, cooling, ventilation and air conditioning industry in the USA, also known as ASHRAE, makes the stipulation which way to go. The basis of calculation from the standard with the ASHRAE requirements, which partly also include the NFRC standards, are implemented in the algorithm of the software.

Due to the fact that the innovations are mainly in the algorithm of the software, the intuitive handling of the modules WINSLT® Standard and WINSLT® Expert remains. A glass structure can be created in a very short time and then analyzed. An extensive database with various products from international glass manufacturers is available for this, which can be extended as required by importing your own spectral data.


The software products “WINSLT®” and “GLASGLOBAL®” of Sommer Informatik GmbH from Rosenheim were extended by a database for tested superstructures and their sound insulation dimensions.

In our presentation video we introduce the new module to you.


Due to its lighter construction and high insulation values, vacuum glass is increasingly used – especially for the renovation of old buildings and in the field of monument protection. The new WINSLT add-on takes this fact into account. It makes it possible for the first time to carry out an exact, fully automatic calculation of vacuum glazing based on existing ISO/FDIS standards.

Further information on the calculation of vacuum glazing: