TC10: Optical Properties

TC10 has recently changed its name to “Optical Properties and Characterization”, most of its activities being based around different optical measurements of glass and coated glass products. However, it retains a sub-group to study basic optical properties.

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TC10 continued investigations into the measurements of scattering and patterned glass products. They introduced a diffuser that allowed a significant reduction in the divergence of their measurements. A report on variable angle transmission and reflection measurements was written. Finally, a calculation inter-laboratory comparison was achieved on standard EN410 and EN673 that showed that almost all participants had correctly integrated the new rules.

The subgroup continued investigations on the modeling of colouring ions in glass and the effect of the tin layer of float glass on the optical properties. A study on solarisation effects was started.

There were two meeting held in 2013 both for the entire TC and the subgroup.


Planning is as follows:

  • Verification of a predictive algorithm for variable angle transmission based on the RRT.
  • Redaction of the method and criteria for scattering and patterned glass products measurements.
  • Publication of results for the inter-laboratory comparison on variable angle measurements.
  • Collection and analysis of the results of a calculation inter-laboratory comparison for complex glazing.

Activities and planned actions

Activities 2016

2 meetings were organised in March in Venice and in September in Lanthom. 

1. Patterned and light scattering glass

TC10 is interested in understanding the behaviour of pattern and light scattering glass. Indeed those glass with a diffused component are hard to caracterised correctly. 

In our previous studies, we have underlighted a new method of measuring those glasses. It includes using a diffusor during the calibration phase as well during the sample measurement. However the diffusor must have some specific characteristic that have been difined previously like : having a high light transmission, be thin and same level of diffusion for all wavelengths. We have thus develop a method called "pull back" method to validate the diffusor. This method was described and send to all participants so each of us was eable to try it. The results will be presented in 2017.

Laminated glass calculation according to EN410

The annex B of standard EN410 (informative) explains the calculations needed for creating simulation of laminates. As the method is not simple, it was decided to check wether the information of the standard can be used in laboratories and exploit in simulations. A set of data was sent to participant so that everybody is using the same raw data. Base on those raw data, participants must create and simulate 3 different laminates with coating and evaluating the optical properties. 

5 labs were able  up to now to send results. It appears quite complex to realise but new participants would like to test. Among the 5 results received,  there is a good agreement for the simple laminate. But discrepancies are observed when the laminates become more complexe. Additionnal analysis will be done in 2017 to find possible origin of the differences. 

3. Complex glazing performences

Complex glazing is defined as any combination of a window glazing unit with a solar protection device, e.g. a shade, roller blind, shutter, Venetian blind etc. with respect to the glazing unit, the solar protection device may be located externally, internally or between the panes of the glazing unit (mid-pane).

The calculation intercomparison builds upon the ICG TC10 2013/14 comparison of the technical values for unshaded glazing units on the basis of spectral data undertaken to ensure competence in essential calculation procedures following the updating and re-issuing of the European Norms EN 410 and EN 673.

Calculations may be performed by the participants using European Norms and/or International Standard procedures and algorithms from in-house developed methods or nationally or internationally recognized window design tools, e.g. EN 13363-1, EN 13363-2, ISO 15099, WIS (Window Information Systems), WINDOW 7, .Parasol etc.

The objective of this round robin test  is to

  • compare calculated values of key technical values obtained by individual participants using common calculation procedures.
  • Compare the differences in key complex glazing performance parameters found using (i) different international standard calculation procedures (where possible to include simplified and detailed calculation methods) and (ii) different respective calculation tools.
  • Evaluate the suitability and/or limitations of the data file formats employed to characterize shading product and complex glazing performance.
  • Identify where possible measures to be considered to promote increased harmonization of calculation methods and procedures and improve the quality of the calculations.

Only 5 laboratories were able to present complete or partial results. There is a good agreement on light transmission except for venetian blinds at 45°. However U and solar factor show wide variation. 

New results are expected in 2017. The project will be closed then. It is considered as interesting but too complex and people maybe notready now forsuch complex calculation. 


RRT on emissivity

Certified body laboratories are required to participate to round robin test at regular frequencies. We took the opportunity to include ICG TC10 to the round robin test organised by INISMA. 2016 was the time of the organisation of the RRT. 6 samples were prepared, among them raw glass and coated glass, single, double and triple silver coatings. Samples were distrituted to 26 laboratories with instructions and workbook. The collection of results (transmission, reflexion and emissivity properties) will happen in 2017.





Committee Members: back to top

Akmaz, Fehiman
Aldrich, Scott
Anderson, Charles
Behrends, Andrea (Guest)
Bolles, Michael (Guest)
Bretschneider, Joachim
Chen, Gourong
Daneo, Antonio
Dotsenko, Alexander
Efimov, Andrei M.
Farmer, James
Feldmeier, Franz (guest)
Freinberger, Michael (Guest)
Gagliardi, Giovanni
Goussarov, Andrei
Gurianov, A
Hofmann, Thomas
Hutchins, Michael G
Jager, Klaus (guest)
Jonsson, Jacob
Kappertz, Olivier
Kermel, Christine
Kilbey, Neva (Guest)
Kinoshita, Taito
L'Heureux, Didier (Guest)
Marenne, Ingrid Committee Position: Chair
Mika, Martin
Niemantsverdriet, Keesjan (Guest)
Nilsson, Annica
Olive, François
Ottermann, Clemens
Roos, Arne
Rossi, Giuseppe
Sartenaer, Yannick (guest)
Schultz, Marcus (guest)
Sigetosi, Hirasima
Stemmler, Ivo
Timmermans, Serge (Guest)
van Nijnatten, Peter
Veiga, Pilar
Weis, Hansjoerg (Guest)
Wilson, Helen Rose
Wuelfken, Jan (guest)
Zhang, Long

Committee Contact Details: back to top

TC10: Optical Properties


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