Research Projects

Infra-red Filtering Window Panel

To develop laminated glass system capable of rejecting a substantial fraction of infra-red radiation while transmitting visible light for the purpose of heat rejecting laminated safety windows.

  • Over 50% of solar energy is in the infra-red range causing significant unwanted heating in tropical regions
  • Over 70% of infra-red radiation is rejected
  • Over 60% of visible light is transmitted
  • Clear with acceptable haziness

Contact PersonZeng Xianting(
SolutionThe technology was developed by identifying nanoparticles that can reject infra-red heat due to their composition and structure. These particles were then incorporated into a matrix material used for lamination of glass panels. It was necessary to use nanoparticles as light is scattered when transmitted through a non-homogenous material. The scattering efficiency is strongly dependent on the particle size and becomes very strong when the size is comparable to the wavelength of transmitted light. Thus, by selecting tiny particles that have dimensions in the order of a few nanometres ensured that the clarity of the glass was acceptable and the haziness was kept to the minimum.

  • Residential and office window installations
  • Skylight installations
Problems Addressed

In tropical environments, warming of offices and homes by sunlight through windows is a major concern as the rising temperature requires more energy for air conditioning. As over 50% of the solar energy is in the form of infra-red radiation, cutting it off from the transmitted sunlight can significantly reduce the warming effect. Thus, new technology was developed by SIMTech that can help in reducing the amount of infra-red radiation while maintaining high transmission of visible light. One important issue is the durability of the infra-red filtering window panel and it is currently being improved to match the stringent requirements for building installations.